organic compounds
2-(4-Nitrophenoxy)benzoic acid: a three-dimensional hydrogen-bonded framework in a triclinic structure having Z′ = 3
aSchool of Chemistry, University of St Andrews, Fife KY16 9ST, Scotland, bDepartment of Chemistry, University of Aberdeen, Meston Walk, Old Aberdeen AB24 3UE, Scotland, and cInstituto de Química, Departamento de Química Inorgânica, Universidade Federal do Rio de Janeiro, 21945-970 Rio de Janeiro, RJ, Brazil
*Correspondence e-mail: cg@st-andrews.ac.uk
The title compound, C13H9NO5, crystallizes in P, with Z′ = 3. The molecules are linked by O—H⋯O hydrogen bonds [H⋯O = 1.79–1.81 Å, O⋯O = 2.625 (3)–2.648 (3) Å and O—H⋯O = 172–176°] into two types of (8) dimer, only one of which is centrosymmetric. An extensive series of soft hydrogen bonds, of C—H⋯O and C—H⋯π(arene) types, links the dimers into a three-dimensional framework.
Comment
Persulfate oxidation of substituted 2-aryloxybenzoic acids yields asymmetrically substituted bis(salicylates), whose formation has been ascribed to the 2-4 coupling of phenoxyl radicals (Thomson & Wylie, 1966). We report here the molecular and supramolecular structure of one such precursor compound, namely 2-(4-nitrophenoxy)benzoic acid, (I).
Compound (I) crystallizes in the triclinic , with Z′ = 3 (Fig. 1). In each of the three independent molecules, the two aryl rings are both rotated away from the plane of the central C/O/C fragment, as shown by the leading torsion angles (Table 1). Likewise, each of the nitro and carboxy groups is rotated away from the plane of the adjacent aryl ring. Comparison of the corresponding values for the three molecules is sufficient to rule out the possibility of any additional symmetry.
The C—O distances within the carboxy groups are consistent with the fully ordered locations of the carboxy H atoms as deduced from difference maps. In each molecule, the central C—O—C angle has a value significantly larger than the idealized tetrahedral angle. The remaining bond lengths and angles show no unusual values.
Molecules of types 1 and 3, containing atoms O1 and O3, respectively (Fig. 1a), are linked into hydrogen-bonded dimers by two independent O—H⋯O hydrogen bonds, both of which are short for their type and nearly linear (Table 2). By contrast, molecules of type 2, containing atom O2 (Fig. 1b), are linked by pairs of O—H⋯O hydrogen bonds into centrosymmetric (8) (Bernstein et al., 1995) dimers. With the centrosymmetric dimer centred at (, , ), the centroid of the non-centrosymmetric dimer is at approximately (0.265, 0.225, 0.416), thus precluding the possibility of any additional inversion centres.
The two types of dimer are linked by an extensive series of soft hydrogen bonds (Braga et al., 1995; Desiraju & Steiner, 1999) into a continuous three-dimensional framework of considerable complexity. However, the descriptive analysis of the framework formation is eased by the adoption of the approach (Gregson et al., 2000). The dimeric units formed by the O—H⋯O hydrogen bonds are linked by the three strongest C—H⋯O hydrogen bonds (the first three such entries in Table 2, all having C—H⋯O angles greater than 160°) into two distinct types of chain running parallel to the [001] direction. These chains are then linked by two weaker C—H⋯O hydrogen bonds (the fourth and fifth such entries in Table 2, with C—H⋯O angles of ∼140° but with H⋯O distances shorter than 2.50 Å). The resulting framework is further reinforced, albeit weakly, by the remaining C—H⋯O hydrogen bonds (which have H⋯O distances slightly longer than 2.50 Å) and by a single C—H⋯π(arene) hydrogen bond.
The centrosymmetric dimers formed by the type 2 molecules are linked by a single C—H⋯O hydrogen bond. Atom C46 in the molecule at (x, y, z), which forms part of the centrosymmetric dimer centred at (, , ), acts as a hydrogen-bond donor to nitro atom O31 in the type 2 molecule at (1 − x, 1 − y, 2 − z), which forms part of the corresponding dimer centred at (, , ). Propagation of this hydrogen bond then generates a chain of rings running parallel to [001] containing (8) rings centred at (, , n + ) (n = zero or integer) and (20) rings centred at (, , n) (n = zero or integer) (Fig. 2).
Molecules of types 1 and 3 are also linked into a [001] chain, but this is more complex than that formed by the type 2 molecules and its formation involves two C—H⋯O hydrogen bonds. In the first such interaction, atom C26 in the type 1 molecule at (x, y, z) acts as a hydrogen-bond donor to nitro atom O51 in the type 3 molecule at (x, y, −1 + z), so linking the dimers formed by molecules 1 and 3 into a C22(18)[(8)] chain of rings (Fig. 3).
In the second of these interactions, atom C13 in the type 1 molecule at (x, y, z) acts as a donor to nitro atom O52 in the type 3 molecule at (1 − x, −y, 1 − z), thereby generating a centrosymmetric four-molecule aggregate centred at (, 0, ) and containing two (8) rings and one R44(40) ring (Fig. 3). The effect of the R44(40) motif is to link the C22(18)[(8)] chains of rings into pairs, forming a complex chain enclosing R44(20) rings centred at (, 0, n) (n = zero or integer) alternating with R44(40) rings centred at (, 0, n + ) (n = zero or integer) (Fig. 3).
There are thus chains of type 2 molecules running along (, , z), and chains containing type 1 and type 3 molecules running along (, 0, z). Two further C—H⋯O hydrogen bonds suffice to link these two types of chain into a single framework. Atom C16 in the type 1 molecule at (x, y, z), which lies in the chain along (, 0, z), acts as a hydrogen-bond donor to nitro atom O32 in the type 2 molecule at (−1 + x, y, −1 + z), which forms part of the chain along (−, , z). Finally, atom C52 in the type 3 molecule at (x, y, z) acts as a donor to nitro atom O31 in the type 2 molecule at (1 − x, 1 − y, 2 − z), which lies in the chain along (, , z). Propagation of these two hydrogen bonds by translation and inversion links all of the [001] chain, and the three remaining hydrogen bonds simply reinforce the resulting framework.
The pattern of the C—H⋯O hydrogen bonds is itself sufficient to preclude any possible additional symmetry; for example, the nitro O atoms in the type 1 molecule, O11 and O12, do not act as hydrogen-bond acceptors, while both of the O atoms in the type 3 molecule, O51 and O52, are acceptors of C—H⋯O hydrogen bonds.
In addition to the hydrogen bonds, there is a short dipolar interaction involving the type 3 molecules only. The C61—O3 bonds in the molecules at (x, y, z) and (−x, −y, 1 − z) are antiparallel; the corresponding O⋯Cvii and O⋯Ovii distances [symmetry code: (vii) −x, −y, 1 − z] are 2.978 (4) and 2.758 (3) Å, respectively, and the C—O⋯Cvii angle is 112.7 (2)°. In this respect, this interaction is reminiscent of the type II interaction between antiparallel pairs of carbonyl groups (Allen et al., 1998).
Experimental
A sample of (I) was prepared by the Ullmann reaction of 2-chlorobenzoic acid with 4-nitrophenol, according to the procedure published by Thomson & Wylie (1966). Crystals suitable for single-crystal X-ray diffraction were grown by slow evaporation of a solution in ethanol (m.p. 435–437 K).
Crystal data
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Data collection
Refinement
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Crystals of (I) are triclinic; was selected and confirmed by the subsequent structure analysis. All H atoms were located from difference maps and then treated as riding atoms, with C—H distances of 0.95 Å and O—H distances of 0.84 Å, and with Uiso(H) values of 1.2Ueq(C) or 1.5Ueq(O). All H atoms were fully ordered. Examination of the refined structure using ADDSYM in PLATON (Spek, 2003) revealed no possible additional symmetry. The quality of the crystals obtained was always poor and this fact may underlie both the low proportion (35%) of the reflections labelled `observed', even at 120 (2) K, and the fairly high merging index (0.12).
Data collection: KappaCCD Server Software (Nonius, 1997); cell DENZO–SMN (Otwinowski & Minor, 1997); data reduction: DENZO–SMN; program(s) used to solve structure: OSCAIL (McArdle, 2003) and SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: OSCAIL and SHELXL97 (Sheldrick, 1997); molecular graphics: PLATON (Spek, 2003); software used to prepare material for publication: SHELXL97 and PRPKAPPA (Ferguson, 1999).
Supporting information
10.1107/S0108270104007036/sk1719sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S0108270104007036/sk1719Isup2.hkl
A sample of (I) was prepared by the Ullmann reaction of 2-chlorobenzoic acid with 4-nitrophenol, following the procedure published by Thomson & Wylie (1966). Crystals suitable for single-crystal X-ray diffraction were grown by slow evaporation of a solution in ethanol; m.p. 435–437 K.
Crystals of (I) are triclinic;
P-1 was selected and confirmed by the subsequent structure analysis. All H atoms were located from difference maps and then treated as riding atoms, with C—H distances of 0.95 Å and O—H distances of 0.84 Å, and with Uiso(H) values of 1.2Ueq(C) or 1.5Ueq(O). All H atoms were fully ordered. Examination of the refined structure using ADDSYM in PLATON (Spek, 2003) revealed no possible additional symmetry. The quality of the crystals obtained was always poor, and this fact may underlie both the low proportion (35%) of the reflections labelled `observed', even at 120 (2) K, and the fairly high merging index, 0.12.Data collection: KappaCCD Server Software (Nonius, 1997); cell
DENZO–SMN (Otwinowski & Minor, 1997); data reduction: DENZO–SMN; program(s) used to solve structure: OSCAIL (McArdle, 2003) and SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: OSCAIL and SHELXL97 (Sheldrick, 1997); molecular graphics: PLATON (Spek, 2003); software used to prepare material for publication: SHELXL97 and PRPKAPPA (Ferguson, 1999).Fig. 1. The independent molecules of compound (I), showing the atom-labelling scheme and the dimers formed by the O—H···O hydrogen bonds. (a) The centrosymmetric dimer formed by the type 2 molecules, where atoms marked `a' are at the symmetry position (1 − x, 1 − y, 1 − z). (b) The dimer formed by the type 1 and type 3 molecules. Displacement ellipsoids are drawn at the 30% probability level. | |
Fig. 2. A stereoview of part of the crystal structure of (I), showing the formation of a [001] chain of R22(8) and R22(20) rings formed by type 2 molecules only. For clarity, H atoms not involved in the motif shown have been omitted. | |
Fig. 3. A stereoview of part of the crystal structure of (I), showing the formation of a complex chain along [001], containing R22(8), R44(20) and R44(40) rings and built from type 1 and type 3 molecules only. For clarity, H atoms not involved in the motif shown have been omitted. |
C13H9NO5 | Z = 6 |
Mr = 259.21 | F(000) = 804 |
Triclinic, P1 | Dx = 1.518 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
a = 7.8495 (6) Å | Cell parameters from 7578 reflections |
b = 14.0847 (15) Å | θ = 2.9–27.5° |
c = 17.2325 (18) Å | µ = 0.12 mm−1 |
α = 113.187 (4)° | T = 120 K |
β = 98.515 (6)° | Lath, colourless |
γ = 96.400 (7)° | 0.15 × 0.06 × 0.02 mm |
V = 1701.5 (3) Å3 |
Nonius KappaCCD diffractometer | 7578 independent reflections |
Radiation source: rotating anode | 2621 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.122 |
ϕ scans, and ω scans with κ offsets | θmax = 27.5°, θmin = 2.9° |
Absorption correction: multi-scan (SORTAV; Blessing, 1995, 1997) | h = −9→10 |
Tmin = 0.966, Tmax = 0.998 | k = −18→18 |
14193 measured reflections | l = −22→22 |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.060 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.149 | H-atom parameters constrained |
S = 0.87 | w = 1/[σ2(Fo2) + (0.0444P)2] where P = (Fo2 + 2Fc2)/3 |
7578 reflections | (Δ/σ)max = 0.001 |
517 parameters | Δρmax = 0.27 e Å−3 |
0 restraints | Δρmin = −0.33 e Å−3 |
C13H9NO5 | γ = 96.400 (7)° |
Mr = 259.21 | V = 1701.5 (3) Å3 |
Triclinic, P1 | Z = 6 |
a = 7.8495 (6) Å | Mo Kα radiation |
b = 14.0847 (15) Å | µ = 0.12 mm−1 |
c = 17.2325 (18) Å | T = 120 K |
α = 113.187 (4)° | 0.15 × 0.06 × 0.02 mm |
β = 98.515 (6)° |
Nonius KappaCCD diffractometer | 7578 independent reflections |
Absorption correction: multi-scan (SORTAV; Blessing, 1995, 1997) | 2621 reflections with I > 2σ(I) |
Tmin = 0.966, Tmax = 0.998 | Rint = 0.122 |
14193 measured reflections |
R[F2 > 2σ(F2)] = 0.060 | 0 restraints |
wR(F2) = 0.149 | H-atom parameters constrained |
S = 0.87 | Δρmax = 0.27 e Å−3 |
7578 reflections | Δρmin = −0.33 e Å−3 |
517 parameters |
x | y | z | Uiso*/Ueq | ||
C11 | 0.0187 (4) | 0.1229 (3) | −0.0777 (2) | 0.0279 (9) | |
C12 | 0.1217 (4) | 0.0594 (3) | −0.0579 (3) | 0.0351 (10) | |
C13 | 0.2194 (5) | 0.0945 (3) | 0.0254 (3) | 0.0366 (10) | |
C14 | 0.2098 (4) | 0.1926 (3) | 0.0860 (2) | 0.0309 (10) | |
C15 | 0.1044 (4) | 0.2551 (3) | 0.0661 (2) | 0.0299 (10) | |
C16 | 0.0073 (4) | 0.2202 (3) | −0.0169 (2) | 0.0301 (10) | |
N11 | −0.0840 (4) | 0.0867 (3) | −0.1663 (2) | 0.0379 (9) | |
O11 | −0.0900 (3) | −0.0047 (3) | −0.21700 (19) | 0.0578 (9) | |
O12 | −0.1585 (3) | 0.1489 (2) | −0.18541 (17) | 0.0397 (7) | |
O1 | 0.2959 (3) | 0.2316 (2) | 0.17212 (16) | 0.0397 (7) | |
C21 | 0.4668 (4) | 0.2191 (3) | 0.1929 (2) | 0.0304 (10) | |
C22 | 0.5221 (4) | 0.2166 (3) | 0.2730 (2) | 0.0258 (9) | |
C23 | 0.6955 (4) | 0.2054 (3) | 0.2947 (2) | 0.0295 (9) | |
C24 | 0.8102 (5) | 0.1993 (3) | 0.2396 (2) | 0.0326 (10) | |
C25 | 0.7506 (5) | 0.2027 (3) | 0.1621 (3) | 0.0355 (10) | |
C26 | 0.5800 (5) | 0.2123 (3) | 0.1377 (2) | 0.0315 (10) | |
C27 | 0.4122 (4) | 0.2223 (3) | 0.3364 (2) | 0.0272 (9) | |
O21 | 0.4402 (3) | 0.1792 (2) | 0.38526 (16) | 0.0336 (7) | |
O22 | 0.2868 (3) | 0.2771 (2) | 0.33782 (17) | 0.0363 (7) | |
C31 | 0.6951 (4) | 0.4867 (3) | 0.9405 (2) | 0.0254 (9) | |
C32 | 0.5916 (4) | 0.5564 (3) | 0.9325 (2) | 0.0296 (10) | |
C33 | 0.4840 (4) | 0.5317 (3) | 0.8531 (2) | 0.0299 (10) | |
C34 | 0.4823 (4) | 0.4370 (3) | 0.7847 (2) | 0.0269 (9) | |
C35 | 0.5890 (4) | 0.3693 (3) | 0.7936 (2) | 0.0286 (9) | |
C36 | 0.6959 (4) | 0.3930 (3) | 0.8722 (2) | 0.0284 (9) | |
N31 | 0.8058 (4) | 0.5127 (3) | 1.0247 (2) | 0.0301 (8) | |
O31 | 0.8254 (3) | 0.6029 (2) | 1.08152 (16) | 0.0351 (7) | |
O32 | 0.8757 (3) | 0.4430 (2) | 1.03572 (16) | 0.0359 (7) | |
O2 | 0.3813 (3) | 0.40673 (19) | 0.70293 (15) | 0.0315 (7) | |
C41 | 0.2375 (4) | 0.4532 (3) | 0.6932 (2) | 0.0290 (9) | |
C42 | 0.2178 (4) | 0.4952 (3) | 0.6321 (2) | 0.0238 (9) | |
C43 | 0.0677 (4) | 0.5371 (3) | 0.6216 (2) | 0.0288 (9) | |
C44 | −0.0600 (4) | 0.5360 (3) | 0.6696 (2) | 0.0315 (10) | |
C45 | −0.0362 (4) | 0.4928 (3) | 0.7285 (2) | 0.0307 (10) | |
C46 | 0.1107 (4) | 0.4507 (3) | 0.7408 (2) | 0.0313 (10) | |
C47 | 0.3440 (4) | 0.4989 (3) | 0.5764 (2) | 0.0281 (9) | |
O41 | 0.3275 (3) | 0.5521 (2) | 0.53363 (17) | 0.0368 (7) | |
O42 | 0.4660 (3) | 0.4433 (2) | 0.57366 (18) | 0.0414 (7) | |
C51 | 0.4107 (4) | 0.1204 (3) | 0.8066 (2) | 0.0256 (9) | |
C52 | 0.2999 (4) | 0.1897 (3) | 0.8082 (2) | 0.0277 (9) | |
C53 | 0.1912 (4) | 0.1766 (3) | 0.7321 (2) | 0.0288 (9) | |
C54 | 0.2001 (4) | 0.0936 (3) | 0.6564 (2) | 0.0259 (9) | |
C55 | 0.3143 (4) | 0.0262 (3) | 0.6548 (2) | 0.0274 (9) | |
C56 | 0.4215 (4) | 0.0390 (3) | 0.7307 (2) | 0.0296 (10) | |
N51 | 0.5205 (4) | 0.1341 (3) | 0.8876 (2) | 0.0330 (8) | |
O51 | 0.5453 (3) | 0.2213 (2) | 0.94948 (17) | 0.0400 (7) | |
O52 | 0.5826 (3) | 0.0590 (2) | 0.89088 (17) | 0.0416 (7) | |
O3 | 0.0995 (3) | 0.07454 (19) | 0.57755 (15) | 0.0313 (7) | |
C61 | −0.0347 (4) | 0.1314 (3) | 0.5753 (2) | 0.0262 (9) | |
C62 | −0.0291 (4) | 0.2005 (3) | 0.5357 (2) | 0.0251 (9) | |
C63 | −0.1677 (4) | 0.2546 (3) | 0.5351 (2) | 0.0275 (9) | |
C64 | −0.3088 (4) | 0.2373 (3) | 0.5701 (2) | 0.0309 (10) | |
C65 | −0.3178 (4) | 0.1630 (3) | 0.6031 (2) | 0.0302 (10) | |
C66 | −0.1799 (4) | 0.1107 (3) | 0.6072 (2) | 0.0304 (10) | |
C67 | 0.1095 (4) | 0.2182 (3) | 0.4896 (2) | 0.0293 (10) | |
O61 | 0.0909 (3) | 0.2709 (2) | 0.44728 (16) | 0.0368 (7) | |
O62 | 0.2432 (3) | 0.1729 (2) | 0.49515 (18) | 0.0416 (7) | |
H12 | 0.1260 | −0.0076 | −0.1007 | 0.042* | |
H13 | 0.2915 | 0.0520 | 0.0405 | 0.044* | |
H15 | 0.0985 | 0.3216 | 0.1091 | 0.036* | |
H16 | −0.0660 | 0.2623 | −0.0319 | 0.036* | |
H23 | 0.7353 | 0.2019 | 0.3481 | 0.035* | |
H24 | 0.9281 | 0.1928 | 0.2553 | 0.039* | |
H25 | 0.8287 | 0.1983 | 0.1241 | 0.043* | |
H26 | 0.5411 | 0.2141 | 0.0835 | 0.038* | |
H22 | 0.2276 | 0.2731 | 0.3736 | 0.054* | |
H32 | 0.5939 | 0.6204 | 0.9805 | 0.035* | |
H33 | 0.4126 | 0.5790 | 0.8456 | 0.036* | |
H35 | 0.5891 | 0.3060 | 0.7453 | 0.034* | |
H36 | 0.7684 | 0.3461 | 0.8792 | 0.034* | |
H43 | 0.0523 | 0.5670 | 0.5809 | 0.035* | |
H44 | −0.1618 | 0.5647 | 0.6618 | 0.038* | |
H45 | −0.1228 | 0.4919 | 0.7615 | 0.037* | |
H46 | 0.1247 | 0.4205 | 0.7813 | 0.038* | |
H42 | 0.5271 | 0.4491 | 0.5391 | 0.062* | |
H52 | 0.2977 | 0.2463 | 0.8611 | 0.033* | |
H53 | 0.1128 | 0.2232 | 0.7320 | 0.035* | |
H55 | 0.3194 | −0.0291 | 0.6017 | 0.033* | |
H56 | 0.5011 | −0.0071 | 0.7307 | 0.035* | |
H63 | −0.1646 | 0.3040 | 0.5102 | 0.033* | |
H64 | −0.3998 | 0.2767 | 0.5713 | 0.037* | |
H65 | −0.4191 | 0.1474 | 0.6232 | 0.036* | |
H66 | −0.1846 | 0.0609 | 0.6317 | 0.036* | |
H62 | 0.3025 | 0.1760 | 0.4592 | 0.062* |
U11 | U22 | U33 | U12 | U13 | U23 | |
C11 | 0.027 (2) | 0.034 (3) | 0.024 (2) | 0.0047 (18) | 0.0035 (17) | 0.015 (2) |
C12 | 0.035 (2) | 0.031 (3) | 0.038 (3) | 0.0082 (19) | 0.007 (2) | 0.012 (2) |
C13 | 0.034 (2) | 0.039 (3) | 0.046 (3) | 0.0153 (19) | 0.008 (2) | 0.026 (2) |
C14 | 0.030 (2) | 0.044 (3) | 0.026 (2) | 0.0115 (19) | 0.0109 (18) | 0.019 (2) |
C15 | 0.024 (2) | 0.035 (3) | 0.032 (2) | 0.0086 (18) | 0.0061 (18) | 0.014 (2) |
C16 | 0.026 (2) | 0.035 (3) | 0.034 (2) | 0.0059 (18) | 0.0082 (18) | 0.020 (2) |
N11 | 0.0277 (18) | 0.047 (3) | 0.035 (2) | 0.0076 (18) | 0.0065 (16) | 0.013 (2) |
O11 | 0.0543 (19) | 0.047 (2) | 0.048 (2) | 0.0119 (16) | −0.0015 (16) | −0.0013 (18) |
O12 | 0.0338 (15) | 0.055 (2) | 0.0375 (18) | 0.0166 (14) | 0.0084 (13) | 0.0248 (16) |
O1 | 0.0332 (15) | 0.065 (2) | 0.0297 (17) | 0.0244 (14) | 0.0098 (13) | 0.0234 (16) |
C21 | 0.028 (2) | 0.036 (3) | 0.034 (2) | 0.0157 (18) | 0.0116 (18) | 0.018 (2) |
C22 | 0.029 (2) | 0.029 (2) | 0.024 (2) | 0.0105 (17) | 0.0108 (17) | 0.0114 (19) |
C23 | 0.032 (2) | 0.026 (2) | 0.029 (2) | 0.0077 (17) | 0.0058 (18) | 0.009 (2) |
C24 | 0.025 (2) | 0.035 (3) | 0.033 (3) | 0.0029 (17) | 0.0090 (19) | 0.010 (2) |
C25 | 0.034 (2) | 0.036 (3) | 0.041 (3) | 0.0095 (19) | 0.019 (2) | 0.015 (2) |
C26 | 0.037 (2) | 0.035 (3) | 0.032 (2) | 0.0132 (19) | 0.0132 (19) | 0.020 (2) |
C27 | 0.020 (2) | 0.027 (2) | 0.029 (2) | 0.0077 (17) | 0.0001 (17) | 0.006 (2) |
O21 | 0.0299 (14) | 0.0499 (19) | 0.0305 (16) | 0.0148 (13) | 0.0079 (12) | 0.0240 (15) |
O22 | 0.0351 (15) | 0.0465 (19) | 0.0409 (18) | 0.0196 (14) | 0.0208 (13) | 0.0247 (15) |
C31 | 0.028 (2) | 0.028 (2) | 0.021 (2) | 0.0054 (18) | 0.0054 (17) | 0.011 (2) |
C32 | 0.026 (2) | 0.031 (3) | 0.032 (2) | 0.0061 (18) | 0.0091 (18) | 0.012 (2) |
C33 | 0.026 (2) | 0.031 (3) | 0.037 (3) | 0.0109 (18) | 0.0071 (19) | 0.018 (2) |
C34 | 0.026 (2) | 0.034 (3) | 0.025 (2) | 0.0077 (18) | 0.0081 (17) | 0.015 (2) |
C35 | 0.028 (2) | 0.030 (3) | 0.031 (2) | 0.0125 (18) | 0.0136 (18) | 0.011 (2) |
C36 | 0.025 (2) | 0.036 (3) | 0.030 (2) | 0.0113 (18) | 0.0075 (18) | 0.018 (2) |
N31 | 0.0268 (18) | 0.036 (2) | 0.032 (2) | 0.0098 (17) | 0.0099 (16) | 0.016 (2) |
O31 | 0.0399 (15) | 0.0310 (18) | 0.0284 (17) | 0.0079 (13) | 0.0042 (13) | 0.0069 (15) |
O32 | 0.0369 (15) | 0.0381 (18) | 0.0375 (17) | 0.0142 (14) | 0.0071 (13) | 0.0193 (15) |
O2 | 0.0351 (15) | 0.0396 (18) | 0.0232 (16) | 0.0174 (13) | 0.0047 (12) | 0.0143 (14) |
C41 | 0.029 (2) | 0.029 (2) | 0.025 (2) | 0.0061 (18) | 0.0026 (17) | 0.008 (2) |
C42 | 0.026 (2) | 0.023 (2) | 0.024 (2) | 0.0084 (16) | 0.0060 (16) | 0.0097 (19) |
C43 | 0.029 (2) | 0.029 (2) | 0.027 (2) | 0.0033 (18) | 0.0014 (17) | 0.012 (2) |
C44 | 0.025 (2) | 0.034 (3) | 0.038 (2) | 0.0118 (18) | 0.0114 (18) | 0.013 (2) |
C45 | 0.032 (2) | 0.029 (3) | 0.031 (2) | 0.0040 (18) | 0.0087 (18) | 0.012 (2) |
C46 | 0.037 (2) | 0.026 (2) | 0.033 (2) | 0.0088 (18) | 0.0110 (19) | 0.013 (2) |
C47 | 0.024 (2) | 0.027 (3) | 0.026 (2) | 0.0069 (18) | 0.0019 (17) | 0.005 (2) |
O41 | 0.0388 (16) | 0.0472 (19) | 0.0393 (17) | 0.0161 (13) | 0.0129 (13) | 0.0297 (16) |
O42 | 0.0404 (17) | 0.053 (2) | 0.051 (2) | 0.0219 (15) | 0.0247 (14) | 0.0336 (17) |
C51 | 0.025 (2) | 0.031 (3) | 0.023 (2) | 0.0069 (18) | 0.0030 (17) | 0.014 (2) |
C52 | 0.028 (2) | 0.031 (3) | 0.024 (2) | 0.0086 (18) | 0.0069 (17) | 0.011 (2) |
C53 | 0.027 (2) | 0.030 (3) | 0.031 (2) | 0.0104 (17) | 0.0037 (18) | 0.013 (2) |
C54 | 0.024 (2) | 0.031 (3) | 0.024 (2) | 0.0054 (18) | 0.0044 (17) | 0.013 (2) |
C55 | 0.028 (2) | 0.027 (2) | 0.026 (2) | 0.0072 (18) | 0.0059 (17) | 0.0088 (19) |
C56 | 0.025 (2) | 0.028 (3) | 0.042 (3) | 0.0096 (17) | 0.0102 (19) | 0.020 (2) |
N51 | 0.0306 (19) | 0.042 (3) | 0.033 (2) | 0.0079 (18) | 0.0104 (16) | 0.022 (2) |
O51 | 0.0453 (17) | 0.042 (2) | 0.0274 (17) | 0.0066 (14) | 0.0032 (13) | 0.0108 (16) |
O52 | 0.0426 (16) | 0.046 (2) | 0.0445 (19) | 0.0159 (15) | 0.0032 (14) | 0.0275 (17) |
O3 | 0.0362 (15) | 0.0337 (17) | 0.0275 (16) | 0.0147 (12) | 0.0066 (12) | 0.0143 (14) |
C61 | 0.032 (2) | 0.025 (2) | 0.020 (2) | 0.0121 (17) | 0.0049 (17) | 0.0061 (19) |
C62 | 0.027 (2) | 0.027 (2) | 0.019 (2) | 0.0080 (17) | 0.0028 (16) | 0.0069 (19) |
C63 | 0.029 (2) | 0.029 (2) | 0.025 (2) | 0.0052 (18) | 0.0036 (17) | 0.013 (2) |
C64 | 0.031 (2) | 0.037 (3) | 0.025 (2) | 0.0136 (18) | 0.0070 (18) | 0.010 (2) |
C65 | 0.031 (2) | 0.032 (3) | 0.026 (2) | 0.0090 (19) | 0.0106 (18) | 0.009 (2) |
C66 | 0.042 (2) | 0.025 (2) | 0.026 (2) | 0.0049 (18) | 0.0124 (18) | 0.010 (2) |
C67 | 0.021 (2) | 0.035 (3) | 0.027 (2) | 0.0087 (18) | 0.0027 (17) | 0.007 (2) |
O61 | 0.0439 (16) | 0.0413 (19) | 0.0376 (18) | 0.0183 (14) | 0.0160 (13) | 0.0240 (16) |
O62 | 0.0346 (16) | 0.058 (2) | 0.048 (2) | 0.0205 (15) | 0.0186 (13) | 0.0311 (17) |
C11—C12 | 1.375 (5) | C36—H36 | 0.95 |
C11—C16 | 1.381 (5) | N31—O31 | 1.237 (4) |
C11—N11 | 1.474 (5) | N31—O32 | 1.239 (4) |
C12—C13 | 1.386 (5) | O2—C41 | 1.388 (4) |
C12—H12 | 0.95 | C41—C46 | 1.386 (5) |
C13—C14 | 1.384 (5) | C41—C42 | 1.394 (5) |
C13—H13 | 0.95 | C42—C43 | 1.395 (5) |
C14—C15 | 1.376 (5) | C42—C47 | 1.488 (5) |
C14—O1 | 1.392 (4) | C43—C44 | 1.393 (4) |
C15—C16 | 1.382 (5) | C43—H43 | 0.95 |
C15—H15 | 0.95 | C44—C45 | 1.375 (5) |
C16—H16 | 0.95 | C44—H44 | 0.95 |
N11—O12 | 1.225 (4) | C45—C46 | 1.380 (5) |
N11—O11 | 1.229 (4) | C45—H45 | 0.95 |
O1—C21 | 1.385 (4) | C46—H46 | 0.95 |
C21—C26 | 1.379 (5) | O42—H42 | 0.84 |
C21—C22 | 1.398 (5) | C51—C52 | 1.372 (5) |
C22—C23 | 1.400 (4) | C51—C56 | 1.381 (5) |
C22—C27 | 1.473 (5) | C51—N51 | 1.458 (4) |
C23—C24 | 1.388 (4) | C52—C53 | 1.387 (5) |
C23—H23 | 0.95 | C52—H52 | 0.95 |
C24—C25 | 1.369 (5) | C53—C54 | 1.385 (5) |
C24—H24 | 0.95 | C53—H53 | 0.95 |
C25—C26 | 1.381 (5) | C54—C55 | 1.372 (5) |
C25—H25 | 0.95 | C54—O3 | 1.374 (4) |
C26—H26 | 0.95 | C55—C56 | 1.380 (5) |
C27—O21 | 1.226 (4) | C55—H55 | 0.95 |
C47—O41 | 1.245 (4) | C56—H56 | 0.95 |
C67—O61 | 1.234 (4) | N51—O52 | 1.230 (4) |
C27—O22 | 1.314 (4) | N51—O51 | 1.240 (4) |
C47—O42 | 1.297 (4) | O3—C61 | 1.398 (4) |
C67—O62 | 1.297 (4) | C61—C66 | 1.387 (4) |
O22—H22 | 0.84 | C61—C62 | 1.392 (5) |
C31—C32 | 1.377 (5) | C62—C63 | 1.397 (5) |
C31—C36 | 1.381 (5) | C62—C67 | 1.493 (5) |
C31—N31 | 1.460 (4) | C63—C64 | 1.380 (4) |
C32—C33 | 1.388 (5) | C63—H63 | 0.95 |
C32—H32 | 0.95 | C64—C65 | 1.375 (5) |
C33—C34 | 1.386 (5) | C64—H64 | 0.95 |
C33—H33 | 0.95 | C65—C66 | 1.384 (5) |
C34—C35 | 1.374 (5) | C65—H65 | 0.95 |
C34—O2 | 1.385 (4) | C66—H66 | 0.95 |
C35—C36 | 1.376 (5) | O62—H62 | 0.84 |
C35—H35 | 0.95 | ||
C12—C11—C16 | 122.1 (4) | C46—C41—O2 | 118.9 (3) |
C12—C11—N11 | 119.5 (4) | C46—C41—C42 | 121.4 (3) |
C16—C11—N11 | 118.5 (4) | O2—C41—C42 | 119.6 (3) |
C11—C12—C13 | 119.1 (4) | C41—C42—C43 | 117.8 (3) |
C11—C12—H12 | 120.4 | C41—C42—C47 | 125.4 (3) |
C13—C12—H12 | 120.4 | C43—C42—C47 | 116.8 (3) |
C14—C13—C12 | 118.8 (4) | C44—C43—C42 | 121.4 (4) |
C14—C13—H13 | 120.6 | C44—C43—H43 | 119.3 |
C12—C13—H13 | 120.6 | C42—C43—H43 | 119.3 |
C15—C14—C13 | 121.8 (4) | C45—C44—C43 | 118.9 (4) |
C15—C14—O1 | 115.5 (4) | C45—C44—H44 | 120.6 |
C13—C14—O1 | 122.6 (4) | C43—C44—H44 | 120.6 |
C14—C15—C16 | 119.4 (4) | C44—C45—C46 | 121.4 (3) |
C14—C15—H15 | 120.3 | C44—C45—H45 | 119.3 |
C16—C15—H15 | 120.3 | C46—C45—H45 | 119.3 |
C11—C16—C15 | 118.8 (4) | C45—C46—C41 | 119.1 (4) |
C11—C16—H16 | 120.6 | C45—C46—H46 | 120.5 |
C15—C16—H16 | 120.6 | C41—C46—H46 | 120.5 |
O12—N11—O11 | 123.7 (4) | O41—C47—O42 | 122.9 (3) |
O12—N11—C11 | 118.5 (4) | O41—C47—C42 | 119.9 (3) |
O11—N11—C11 | 117.8 (4) | O42—C47—C42 | 117.1 (3) |
C14—O1—C21 | 120.1 (3) | C47—O42—H42 | 109.5 |
C26—C21—O1 | 121.2 (3) | C52—C51—C56 | 121.9 (3) |
C26—C21—C22 | 121.1 (3) | C52—C51—N51 | 118.7 (3) |
O1—C21—C22 | 117.7 (3) | C56—C51—N51 | 119.4 (3) |
C21—C22—C23 | 117.8 (3) | C51—C52—C53 | 119.6 (4) |
C21—C22—C27 | 125.6 (3) | C51—C52—H52 | 120.2 |
C23—C22—C27 | 116.5 (3) | C53—C52—H52 | 120.2 |
C24—C23—C22 | 121.2 (4) | C54—C53—C52 | 118.2 (4) |
C24—C23—H23 | 119.4 | C54—C53—H53 | 120.9 |
C22—C23—H23 | 119.4 | C52—C53—H53 | 120.9 |
C25—C24—C23 | 118.9 (4) | C55—C54—O3 | 115.3 (3) |
C25—C24—H24 | 120.6 | C55—C54—C53 | 121.9 (3) |
C23—C24—H24 | 120.6 | O3—C54—C53 | 122.8 (3) |
C24—C25—C26 | 121.7 (4) | C54—C55—C56 | 119.7 (4) |
C24—C25—H25 | 119.1 | C54—C55—H55 | 120.1 |
C26—C25—H25 | 119.1 | C56—C55—H55 | 120.1 |
C21—C26—C25 | 119.2 (4) | C55—C56—C51 | 118.5 (4) |
C21—C26—H26 | 120.4 | C55—C56—H56 | 120.7 |
C25—C26—H26 | 120.4 | C51—C56—H56 | 120.7 |
O21—C27—O22 | 123.0 (3) | O52—N51—O51 | 123.9 (3) |
O21—C27—C22 | 120.9 (3) | O52—N51—C51 | 118.5 (3) |
O22—C27—C22 | 116.1 (4) | O51—N51—C51 | 117.6 (3) |
C27—O22—H22 | 109.5 | C54—O3—C61 | 118.4 (3) |
C32—C31—C36 | 122.3 (4) | C66—C61—C62 | 120.9 (3) |
C32—C31—N31 | 118.4 (3) | C66—C61—O3 | 118.2 (3) |
C36—C31—N31 | 119.2 (3) | C62—C61—O3 | 120.7 (3) |
C31—C32—C33 | 118.9 (4) | C61—C62—C63 | 118.0 (3) |
C31—C32—H32 | 120.6 | C61—C62—C67 | 125.3 (3) |
C33—C32—H32 | 120.6 | C63—C62—C67 | 116.6 (3) |
C34—C33—C32 | 118.9 (4) | C64—C63—C62 | 121.0 (4) |
C34—C33—H33 | 120.5 | C64—C63—H63 | 119.5 |
C32—C33—H33 | 120.5 | C62—C63—H63 | 119.5 |
C35—C34—O2 | 115.8 (3) | C65—C64—C63 | 120.0 (4) |
C35—C34—C33 | 121.3 (4) | C65—C64—H64 | 120.0 |
O2—C34—C33 | 122.9 (3) | C63—C64—H64 | 120.0 |
C34—C35—C36 | 120.2 (4) | C64—C65—C66 | 120.3 (3) |
C34—C35—H35 | 119.9 | C64—C65—H65 | 119.9 |
C36—C35—H35 | 119.9 | C66—C65—H65 | 119.9 |
C35—C36—C31 | 118.4 (4) | C65—C66—C61 | 119.6 (4) |
C35—C36—H36 | 120.8 | C65—C66—H66 | 120.2 |
C31—C36—H36 | 120.8 | C61—C66—H66 | 120.2 |
O31—N31—O32 | 123.1 (3) | O61—C67—O62 | 123.7 (3) |
O31—N31—C31 | 118.6 (3) | O61—C67—C62 | 120.1 (3) |
O32—N31—C31 | 118.3 (3) | O62—C67—C62 | 116.2 (4) |
C34—O2—C41 | 119.2 (3) | C67—O62—H62 | 109.5 |
C16—C11—C12—C13 | −1.0 (6) | N31—C31—C36—C35 | 179.2 (3) |
N11—C11—C12—C13 | 179.3 (3) | C36—C31—N31—O31 | 168.9 (3) |
C11—C12—C13—C14 | 0.0 (5) | C32—C31—N31—O32 | 168.0 (3) |
C12—C13—C14—C15 | 0.9 (5) | C36—C31—N31—O32 | −11.2 (5) |
C12—C13—C14—O1 | 176.5 (3) | C35—C34—O2—C41 | 162.2 (3) |
C13—C14—C15—C16 | −1.0 (5) | C34—O2—C41—C46 | −54.7 (4) |
O1—C14—C15—C16 | −176.9 (3) | C46—C41—C42—C43 | 1.5 (5) |
C12—C11—C16—C15 | 0.9 (5) | O2—C41—C42—C43 | 177.3 (3) |
N11—C11—C16—C15 | −179.4 (3) | C46—C41—C42—C47 | −178.4 (3) |
C14—C15—C16—C11 | 0.1 (5) | O2—C41—C42—C47 | −2.5 (5) |
C12—C11—N11—O12 | −171.6 (3) | C41—C42—C43—C44 | −0.8 (5) |
C16—C11—N11—O12 | 8.7 (5) | C47—C42—C43—C44 | 179.0 (3) |
C16—C11—N11—O11 | −171.2 (3) | C42—C43—C44—C45 | 0.2 (5) |
C15—C14—O1—C21 | −141.2 (3) | C43—C44—C45—C46 | −0.1 (5) |
C14—O1—C21—C26 | 28.5 (5) | C44—C45—C46—C41 | 0.7 (5) |
C13—C14—O1—C21 | 43.0 (5) | O2—C41—C46—C45 | −177.3 (3) |
C33—C34—O2—C41 | −20.9 (5) | C42—C41—C46—C45 | −1.4 (5) |
C53—C54—O3—C61 | −9.5 (5) | C43—C42—C47—O41 | 11.1 (5) |
C14—O1—C21—C22 | −153.2 (3) | C41—C42—C47—O42 | 12.4 (5) |
C34—O2—C41—C42 | 129.4 (3) | C43—C42—C47—O42 | −167.4 (3) |
C54—O3—C61—C62 | 115.8 (4) | C56—C51—C52—C53 | 2.0 (5) |
C12—C11—N11—O11 | 8.5 (5) | N51—C51—C52—C53 | −178.4 (3) |
C32—C31—N31—O31 | −11.9 (5) | C51—C52—C53—C54 | −0.7 (5) |
C52—C51—N51—O51 | −19.2 (5) | C52—C53—C54—C55 | −1.0 (5) |
C21—C22—C27—O21 | 150.2 (4) | C52—C53—C54—O3 | −179.2 (3) |
C41—C42—C47—O41 | −169.0 (3) | O3—C54—C55—C56 | 179.8 (3) |
C61—C62—C67—O61 | 170.8 (3) | C53—C54—C55—C56 | 1.4 (5) |
C26—C21—C22—C23 | −0.9 (6) | C54—C55—C56—C51 | −0.1 (5) |
O1—C21—C22—C23 | −179.2 (3) | C52—C51—C56—C55 | −1.6 (5) |
C26—C21—C22—C27 | −179.4 (3) | N51—C51—C56—C55 | 178.8 (3) |
O1—C21—C22—C27 | 2.3 (6) | C52—C51—N51—O52 | 160.6 (3) |
C21—C22—C23—C24 | 1.4 (5) | C56—C51—N51—O52 | −19.8 (5) |
C27—C22—C23—C24 | 180.0 (3) | C56—C51—N51—O51 | 160.4 (3) |
C22—C23—C24—C25 | −1.0 (6) | C55—C54—O3—C61 | 172.1 (3) |
C23—C24—C25—C26 | 0.1 (6) | C54—O3—C61—C66 | −69.4 (4) |
O1—C21—C26—C25 | 178.3 (3) | C66—C61—C62—C63 | 5.0 (5) |
C22—C21—C26—C25 | 0.1 (6) | O3—C61—C62—C63 | 179.6 (3) |
C24—C25—C26—C21 | 0.3 (6) | C66—C61—C62—C67 | −171.9 (3) |
C23—C22—C27—O21 | −28.3 (5) | O3—C61—C62—C67 | 2.7 (5) |
C21—C22—C27—O22 | −30.9 (5) | C61—C62—C63—C64 | −2.2 (5) |
C23—C22—C27—O22 | 150.6 (3) | C67—C62—C63—C64 | 174.9 (3) |
C36—C31—C32—C33 | 0.1 (5) | C62—C63—C64—C65 | −2.6 (5) |
N31—C31—C32—C33 | −179.0 (3) | C63—C64—C65—C66 | 4.7 (5) |
C31—C32—C33—C34 | 0.9 (5) | C64—C65—C66—C61 | −2.0 (5) |
C32—C33—C34—C35 | −2.2 (5) | C62—C61—C66—C65 | −3.0 (5) |
C32—C33—C34—O2 | −178.9 (3) | O3—C61—C66—C65 | −177.7 (3) |
O2—C34—C35—C36 | 179.3 (3) | C63—C62—C67—O61 | −6.2 (5) |
C33—C34—C35—C36 | 2.4 (5) | C61—C62—C67—O62 | −7.3 (5) |
C34—C35—C36—C31 | −1.3 (5) | C63—C62—C67—O62 | 175.7 (3) |
C32—C31—C36—C35 | 0.1 (5) |
D—H···A | D—H | H···A | D···A | D—H···A |
O22—H22···O61 | 0.84 | 1.79 | 2.625 (3) | 175 |
O42—H42···O41i | 0.84 | 1.81 | 2.648 (3) | 172 |
O62—H62···O21 | 0.84 | 1.80 | 2.637 (3) | 176 |
C46—H46···O31ii | 0.95 | 2.49 | 3.413 (5) | 163 |
C26—H26···O51iii | 0.95 | 2.36 | 3.268 (5) | 161 |
C13—H13···O52iv | 0.95 | 2.50 | 3.422 (5) | 163 |
C16—H16···O32v | 0.95 | 2.48 | 3.241 (5) | 138 |
C52—H52···O31ii | 0.95 | 2.35 | 3.153 (5) | 142 |
C32—H32···O51ii | 0.95 | 2.54 | 3.388 (5) | 149 |
C44—H44···O22vi | 0.95 | 2.53 | 3.370 (5) | 147 |
C55—H55···Cg1vii | 0.95 | 2.87 | 3.745 (4) | 154 |
Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) −x+1, −y+1, −z+2; (iii) x, y, z−1; (iv) −x+1, −y, −z+1; (v) x−1, y, z−1; (vi) −x, −y+1, −z+1; (vii) −x, −y, −z+1. |
Experimental details
Crystal data | |
Chemical formula | C13H9NO5 |
Mr | 259.21 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 120 |
a, b, c (Å) | 7.8495 (6), 14.0847 (15), 17.2325 (18) |
α, β, γ (°) | 113.187 (4), 98.515 (6), 96.400 (7) |
V (Å3) | 1701.5 (3) |
Z | 6 |
Radiation type | Mo Kα |
µ (mm−1) | 0.12 |
Crystal size (mm) | 0.15 × 0.06 × 0.02 |
Data collection | |
Diffractometer | Nonius KappaCCD diffractometer |
Absorption correction | Multi-scan (SORTAV; Blessing, 1995, 1997) |
Tmin, Tmax | 0.966, 0.998 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 14193, 7578, 2621 |
Rint | 0.122 |
(sin θ/λ)max (Å−1) | 0.649 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.060, 0.149, 0.87 |
No. of reflections | 7578 |
No. of parameters | 517 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.27, −0.33 |
Computer programs: KappaCCD Server Software (Nonius, 1997), DENZO–SMN (Otwinowski & Minor, 1997), DENZO–SMN, OSCAIL (McArdle, 2003) and SHELXS97 (Sheldrick, 1997), OSCAIL and SHELXL97 (Sheldrick, 1997), PLATON (Spek, 2003), SHELXL97 and PRPKAPPA (Ferguson, 1999).
C27—O21 | 1.226 (4) | C27—O22 | 1.314 (4) |
C47—O41 | 1.245 (4) | C47—O42 | 1.297 (4) |
C67—O61 | 1.234 (4) | C67—O62 | 1.297 (4) |
C14—O1—C21 | 120.1 (3) | C54—O3—C61 | 118.4 (3) |
C34—O2—C41 | 119.2 (3) | ||
C13—C14—O1—C21 | 43.0 (5) | C12—C11—N11—O11 | 8.5 (5) |
C33—C34—O2—C41 | −20.9 (5) | C32—C31—N31—O31 | −11.9 (5) |
C53—C54—O3—C61 | −9.5 (5) | C52—C51—N51—O51 | −19.2 (5) |
C14—O1—C21—C22 | −153.2 (3) | C21—C22—C27—O21 | 150.2 (4) |
C34—O2—C41—C42 | 129.4 (3) | C41—C42—C47—O41 | −169.0 (3) |
C54—O3—C61—C62 | 115.8 (4) | C61—C62—C67—O61 | 170.8 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
O22—H22···O61 | 0.84 | 1.79 | 2.625 (3) | 175 |
O42—H42···O41i | 0.84 | 1.81 | 2.648 (3) | 172 |
O62—H62···O21 | 0.84 | 1.80 | 2.637 (3) | 176 |
C46—H46···O31ii | 0.95 | 2.49 | 3.413 (5) | 163 |
C26—H26···O51iii | 0.95 | 2.36 | 3.268 (5) | 161 |
C13—H13···O52iv | 0.95 | 2.50 | 3.422 (5) | 163 |
C16—H16···O32v | 0.95 | 2.48 | 3.241 (5) | 138 |
C52—H52···O31ii | 0.95 | 2.35 | 3.153 (5) | 142 |
C32—H32···O51ii | 0.95 | 2.54 | 3.388 (5) | 149 |
C44—H44···O22vi | 0.95 | 2.53 | 3.370 (5) | 147 |
C55—H55···Cg1vii | 0.95 | 2.87 | 3.745 (4) | 154 |
Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) −x+1, −y+1, −z+2; (iii) x, y, z−1; (iv) −x+1, −y, −z+1; (v) x−1, y, z−1; (vi) −x, −y+1, −z+1; (vii) −x, −y, −z+1. |
Acknowledgements
X-ray data were collected at the EPSRC X-ray Crystallographic Service, University of Southampton, England; the authors thank the staff for all their help and advice. JNL thanks NCR Self-Service, Dundee, for grants that have provided computing facilities for this work. JLW thanks CNPq and FAPERJ for financial support.
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Persulfate oxidation of substituted 2-aryloxybenzoic acids yields asymmetrically substituted bis(salicylates), whose formation was ascribed to the 2–4 coupling of phenoxyl radicals (Thomson & Wylie, 1966). We report here the molecular and supramolecular structure of one such precursor compound, 2-(4-nitrophenoxy)benzoic acid, O2NC6H4OC6H4COOH, (I).
Compound (I) crystallizes in the triclinic space group P-1 with Z' = 3 (Fig. 1). In each of the three independent molecules, the two aryl rings are both rotated away from the plane of the central C/O/C fragment, as shown by the leading torsion angles (Table 1). Likewise, each of the nitro and carboxy groups is rotated away from the plane of the adjacent aryl ring. Comparison of the corresponding values for the three molecules is sufficient to rule out the possibility of any additional symmetry.
The C—O distances within the carboxy groups are consistent with the fully ordered locations of the carboxy H atoms, as deduced from difference maps. In each molecule, the central C—O—C angle has a value significantly larger than the idealized tetrahedral angle. The remaining bond lengths and angles show no unusual values.
Molecules of types 1 and 3, containing atoms O1 and O3, respectively (Fig. 1a), are linked into hydrogen-bonded dimers by two independent O—H···O hydrogen bonds, both of which are short for their type and nearly linear (Table 2). By contrast, molecules of type 2, containing atom O2 (Fig 1 b), are linked by pairs of O—H···O hydrogen bonds into centrosymmetric R22(8) (Bernstein et al., 1995) dimers. With the centrosymmetric dimer centred at (1/2, 1/2, 1/2), the centroid of the non-centrosymmetric dimer is at approximately (0.265, 0.225, 0.416), thus precluding the possibility of any additional inversion centres.
The two types of dimer are linked by an extensive series of soft (Braga et al., 1995; Desiraju & Steiner, 1999) hydrogen bonds into a continuous three-dimensional framework of considerable complexity. However, the descriptive analysis of the framework formation is materially eased by the adoption of the substructure approach (Gregson et al., 2000). The dimeric units formed by the O—H···O hydrogen bonds are linked by the three strongest C—H···O hydrogen bonds (the first three such entries in Table 2, all having C—H···O angles above 160°) into two distinct types of chain running parallel to the [001] direction. These chains are then linked by two weaker C—H···O hydrogen bonds (the fourth and fifth such entries in Table 2, with C—H···O angles of around 140° but with H···O distances shorter than 2.50 Å). The resulting framework is further reinforced, albeit weakly, by the remaining C—H···O hydrogen bonds (which have H···O distances slightly longer than 2.50 Å) and by a single C—H···π(arene) hydrogen bond.
The centrosymmetric dimers formed by the type 2 molecules are linked by a single C—H···O hydrogen bond. Atom C46 in the molecule at (x, y, z), which forms part of the centrosymmetric dimer centred at (1/2, 1/2, 1/2), acts as a hydrogen-bond donor to nitro atom O31 in the type 2 molecule at (1 − x, 1 − y, 2 − z), which forms part of the corresponding dimer centred at (1/2, 1/2, 1.5). Propagation of this hydrogen bond then generates a chain of rings running parallel to [001], containing R22(8) rings centred at (1/2, 1/2, n + 1/2) (n = zero or integer) and R22(20) rings centred at (1/2, 1/2, n) (n = zero or integer) (Fig. 2).
Molecules of types 1 and 3 are also linked into a [001] chain, but this is more complex than that formed by the type 2 molecules and its formation involves two C—H···O hydrogen bonds. In the first such interaction, atom C26 in the type 1 molecule at (x, y, z) acts as a hydrogen-bond donor to nitro atom O51 in the type 3 molecule at (x, y, −1 + z), so linking the dimers formed by molecules 1 and 3 into a C22(18)[R22(8)] chain of rings (Fig. 3).
In the second of these interactions, atom C13 in the type 1 molecule at (x, y, z) acts as a donor to nitro atom O52 in the type 3 molecule at (1 − x, −y, 1 − z), thereby generating a centrosymmetric four-molecule aggregate centred at (1/2, 0, 1/2) and containing two R22(8) rings and one R44(40) ring (Fig. 3). The effect of the R44(40) motif is to link the C22(18)[R22(8)] chains of rings into pairs, forming a complex chain enclosing R44(20) rings centred at (1/2, 0, n) (n = zero or integer) alternating with R44(40) rings centred at (1/2, 0, n + 1/2) (n = zero or integer) (Fig. 3).
There are thus chains of type 2 molecules running along (1/2, 1/2, z) and chains containing type 1 and type 3 molecules running along (1/2, 0, z). Two further C—H···O hydrogen bonds suffice to link these two types of chain into a single framework. Atom C16 in the type 1 molecule at (x, y, z), which lies in the chain along (1/2, 0, z), acts as a hydrogen-bond donor to nitro atom O32 in the type 2 molecule at (−1 + x, y, −1 + z), which forms part of the chain along (−0.5, 1/2, z). Finally, atom C52 in the type 3 molecule at (x, y, z) acts as a donor to nitro atom O31 in the type 2 molecule at (1 − x, 1 − y, 2 − z), which lies in the chain along (1/2, 1/2, z). Propagation of these two hydrogen bonds by translation and inversion links all of the [001] chain, and the three remaining hydrogen bonds simply reinforce the resulting framework.
The pattern of the C—H···O hydrogen bonds is itself sufficient to preclude any possible additional symmetry; for example, the nitro O atoms in the type 1 molecule, O11 and O12, do not act as hydrogen-bond acceptors, while both of the O atoms in the type 3 molecule, O51 and O52, are acceptors of C—H···O hydrogen bonds.
In addition to the hydrogen bonds, there is a short dipolar interaction involving the type 3 molecules only. The C61—O3 bonds in the molecules at (x, y, z) and (-x, −y, 1 − z) are antiparallel; the corresponding O···Cvii and O···Ovii distances [symmetry code: (vii) −x, −y, 1 − z] are 2.978 (4) and 2.758 (3) Å, respectively, and the C—O···Cvii angle is 112.7 (2)°. In this respect, this interaction is reminiscent of the type (II) interaction between antiparallel pairs of carbonyl groups (Allen et al., 1998).
Cg1 is ring centroid for ring C61—C66 in the type 3 molecule; soft hydrogen bonds are listed in the order in which they are discussed in the Comment section.