organic compounds
4-Cyanobenzaldehyde isonicotinoylhydrazone monohydrate: a three-dimensional hydrogen-bonded framework structure
aInstituto de Tecnologia em Fármacos, Far-Manguinhos, FIOCRUZ, 21041-250 Rio de Janeiro, RJ, Brazil, bInstituto de Química, Departamento de Química Inorgânica, Universidade Federal do Rio de Janeiro, CP 68563, 21945-970 Rio de Janeiro, RJ, Brazil, cDepartment of Chemistry, University of Aberdeen, Meston Walk, Old Aberdeen AB24 3UE, Scotland, and dSchool of Chemistry, University of St Andrews, Fife KY16 9ST, Scotland
*Correspondence e-mail: cg@st-andrews.ac.uk
In the title compound, C14H10N4O·H2O, the molecular components are linked into a three-dimensional framework by three hydrogen bonds, one each of the O—H⋯O, O—H⋯N and N—H⋯O types, weakly augmented by two C—H⋯O hydrogen bonds.
Comment
As part of a more general study of isonicotinoylhydrazones (Wardell, de Souza, Ferreira et al., 2005; Wardell, de Souza, Wardell et al., 2005; Wardell et al., 2006; Low et al., 2006), we report here the molecular and supramolecular structure of the title compound, (I) (Fig. 1), which was crystallized from damp ethanol as a stoichiometric monohydrate.
The central spacer unit of the hydrazone component, between atoms C14 and C21 (Fig. 1), is effectively planar with an all-trans extended-chain conformation, as shown by the key torsion angles (Table 1); the two rings, on the other hand, are each rotated out of this plane, so that the hydrazone molecules have no internal symmetry and thus are chiral. While the bulk sample is racemic, in the absence of any inversion each crystal contains only a single enantiomer.
Within the selected and Table 2). These bimolecular units are then linked into a three-dimensional framework by one O—H⋯N and one O—H⋯O hydrogen bond, whose action may be weakly augmented by a second C—H⋯O hydrogen bond, although this augmentation is not essential to the framework formation. The formation of the framework is readily analysed in terms of three one-dimensional substructures, one formed by the inter-aggregate O—H⋯O hydrogen bond, one formed by the inter-aggregate O—H⋯N hydrogen bond and one involving both of these interactions. For the sake of simplicity, we shall omit any further consideration of the C—H⋯O hydrogen bonds, which are both likely to be weak, and which do not influence the overall dimensionality of the supramolecular structure.
the two independent molecular components are linked by an almost linear N—H⋯O hydrogen bond, weakly augmented by a C—H⋯O hydrogen bond (Fig. 1In the first x, y, z) acts as a hydrogen-bond donor, via H2A, to carbonyl atom O1 at (1 − x, − + y, − z), so forming a C22(6) (Bernstein et al., 1995) chain running parallel to the [010] direction and generated by the 21 screw axis along (, y, ) (Fig. 2). In the second water atom O2 at (x, y, z) acts as a hydrogen-bond donor, this time via H2B, to pyridyl atom N11 at ( − x, 1 − y, + z), so forming a C22(9) chain running parallel to the [001] direction and generated by the 21 screw axis along (, , z) (Fig. 3). Each of these two chains involves only one type of inter-aggregate hydrogen bond; the alternation of the two types of inter-aggregate hydrogen bond generates a C44(15) chain running parallel to the [100] direction (Fig. 4). The combination of the two chain motifs, along [100], [010] and [001], is sufficient to link all the molecules into a single three-dimensional framework structure.
water atom O2 at (Experimental
A mixture of 4-cyanobenzaldehyde and isonicotinoylhydrazine (10 mmol of each) in tetrahydrofuran (20 ml) was heated under reflux until ca 4 h reaction time). The solution was cooled and the solvent was removed under reduced pressure; the residue was washed successively with cold ethanol and then diethyl ether, and the resulting solid product was recrystallized from reagent-grade ethanol (ethanol/water, 97:3 v/v) to give crystals of the monohydrate (I) suitable for single-crystal X-ray diffraction (yield 76%; m.p. 498–499 K). GC/MS m/z 250 [M]+. NMR (DMSO-d6): δ(H) 7.83 (2H, d, J = 5.5 Hz, H13 and H15), 7.94 (4H, m, H22, H23, H25 and H26), 8.52 (1H, s, N=C—H), 8.80 (2H, d, J = 5.5 Hz, H12 and H16), 12.31 (1H, s, NH); δ(C) 161.9, 150.4, 147.0, 140.2, 138.4, 132.8, 127.8, 121.5, 118.6, 112.2. IR (KBr pellets, cm−1): 3163 (NH), 2223 (CN), 1668 (C=O).
(on silica gel, with a chloroform/methanol mixture as eluant) indicated complete reaction (Crystal data
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Refinement
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The P212121 was uniquely assigned from the All H atoms were located in difference maps and then treated as riding atoms. H atoms bonded to C or N atoms were assigned C—H distances of 0.95 Å and N—H distances of 0.90 Å [Uiso(H) = 1.2Ueq(C,N)]; H atoms bonded to O atoms were permitted to ride at the positions derived from the difference maps, with O—H distances of 0.95 Å and Uiso(H) values of 1.5Ueq(O). In the absence of significant resonance scattering it was not possible to establish the of the molecules in the crystal selected for data collection, although this configuration has no chemical significance; accordingly, the Friedel equivalent reflections were merged prior to the final refinements.
Data collection: COLLECT (Hooft, 1999); cell DENZO (Otwinowski & Minor, 1997) and COLLECT; data reduction: DENZO and COLLECT; 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/S0108270107002788/av3063sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S0108270107002788/av3063Isup2.hkl
A mixture of 4-cyanobenzaldehyde and isonicotinoylhydrazine (10 mmol of each) in tetrahydrofuran (20 ml) was heated under reflux, until δ(H) 7.83 (2H, d, J = 5.5 Hz, H13 and H15), 7.94 (4H, m, H22, H23, H25 and H26), 8.52 (1H, s, N═C—H), 8.80 (2H, d, J = 5.5 Hz, H12 and H16), 12.31 (1H, s, NH); δ(C) 161.9, 150.4, 147.0, 140.2, 138.4, 132.8, 127.8, 121.5, 118.6, 112.2. IR (KBr pellets, cm-1): 3163 (NH), 2223 (CN), 1668 (C═O).
(on silica gel, with a chloroform/methanol mixture as eluant) indicated complete reaction (ca 4 h reaction time). The solution was cooled, and the solvent was removed under reduced pressure; the residue was washed successively with cold ethanol and then diethyl ether, and the resulting solid product was recrystallized from reagent-grade ethanol (ethanol/water, 97:3 v/v) to give crystals of the monohydrate (I) suitable for single-crystal X-ray diffraction (yield 76%, m.p. 498–499 K). GC/MS m/z 250 [M]+. NMR (DMSO-d6):The
P212121 was uniquely assigned from the All H atoms were located in difference maps and then treated as riding atoms. The H atoms bonded to C or N atoms were assigned C—H distances of 0.95 Å and N—H distances of 0.90 Å [Uiso(H) = 1.2Ueq(C,N)]; the H atoms bonded to O were permitted to ride at the positions derived from the difference maps, with O—H distances of 0.95 Å and Uiso(H) values of 1.5Ueq(O). In the absence of significant resonance scattering it was not possible to establish the of the molecules in the crystal selected for data collection, although this configuration has no chemical significance; accordingly the Friedel equivalent reflections were merged prior to the final refinements.Data collection: COLLECT (Hooft, 1999); cell
DENZO (Otwinowski & Minor, 1997) and COLLECT; data reduction: DENZO and COLLECT; 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).C14H10N4O·H2O | F(000) = 560 |
Mr = 268.28 | Dx = 1.419 Mg m−3 |
Orthorhombic, P212121 | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: P 2ac 2ab | Cell parameters from 1664 reflections |
a = 6.9692 (2) Å | θ = 3.2–27.5° |
b = 12.3802 (5) Å | µ = 0.10 mm−1 |
c = 14.5513 (7) Å | T = 120 K |
V = 1255.49 (9) Å3 | Needle, colourless |
Z = 4 | 0.62 × 0.04 × 0.03 mm |
Bruker–Nonius KappaCCD diffractometer | 1664 independent reflections |
Radiation source: Bruker-Nonius FR591 rotating anode | 1437 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.069 |
Detector resolution: 9.091 pixels mm-1 | θmax = 27.5°, θmin = 3.2° |
ϕ and ω scans | h = −8→9 |
Absorption correction: multi-scan (SADABS; Sheldrick, 2003) | k = −15→16 |
Tmin = 0.956, Tmax = 0.997 | l = −18→16 |
14838 measured reflections |
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)] = 0.045 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.107 | H-atom parameters constrained |
S = 1.06 | w = 1/[σ2(Fo2) + (0.0426P)2 + 0.6011P] where P = (Fo2 + 2Fc2)/3 |
1664 reflections | (Δ/σ)max < 0.001 |
181 parameters | Δρmax = 0.25 e Å−3 |
0 restraints | Δρmin = −0.20 e Å−3 |
C14H10N4O·H2O | V = 1255.49 (9) Å3 |
Mr = 268.28 | Z = 4 |
Orthorhombic, P212121 | Mo Kα radiation |
a = 6.9692 (2) Å | µ = 0.10 mm−1 |
b = 12.3802 (5) Å | T = 120 K |
c = 14.5513 (7) Å | 0.62 × 0.04 × 0.03 mm |
Bruker–Nonius KappaCCD diffractometer | 1664 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 2003) | 1437 reflections with I > 2σ(I) |
Tmin = 0.956, Tmax = 0.997 | Rint = 0.069 |
14838 measured reflections |
R[F2 > 2σ(F2)] = 0.045 | 0 restraints |
wR(F2) = 0.107 | H-atom parameters constrained |
S = 1.06 | Δρmax = 0.25 e Å−3 |
1664 reflections | Δρmin = −0.20 e Å−3 |
181 parameters |
x | y | z | Uiso*/Ueq | ||
O1 | 0.5854 (3) | 0.87688 (14) | 0.25628 (12) | 0.0256 (4) | |
O2 | 0.6942 (3) | 0.49433 (16) | 0.34695 (13) | 0.0357 (5) | |
N11 | 0.6539 (3) | 0.60244 (19) | 0.00504 (14) | 0.0256 (5) | |
N17 | 0.6212 (3) | 0.72012 (18) | 0.33699 (13) | 0.0207 (5) | |
N24 | 0.5886 (4) | 0.94939 (19) | 0.91661 (16) | 0.0315 (6) | |
N27 | 0.6188 (3) | 0.77410 (18) | 0.42019 (14) | 0.0218 (5) | |
C12 | 0.5845 (4) | 0.5548 (2) | 0.08036 (17) | 0.0243 (6) | |
C13 | 0.5670 (4) | 0.6063 (2) | 0.16461 (16) | 0.0213 (5) | |
C14 | 0.6212 (4) | 0.7137 (2) | 0.17152 (15) | 0.0188 (5) | |
C15 | 0.6884 (4) | 0.7656 (2) | 0.09294 (16) | 0.0218 (6) | |
C16 | 0.7044 (4) | 0.7068 (2) | 0.01244 (17) | 0.0243 (6) | |
C17 | 0.6062 (3) | 0.77877 (19) | 0.25858 (16) | 0.0174 (5) | |
C21 | 0.6297 (4) | 0.7652 (2) | 0.58305 (18) | 0.0219 (6) | |
C22 | 0.6060 (4) | 0.7004 (2) | 0.66048 (17) | 0.0249 (6) | |
C23 | 0.5973 (4) | 0.7464 (2) | 0.74722 (19) | 0.0226 (6) | |
C24 | 0.6104 (4) | 0.8584 (2) | 0.75670 (17) | 0.0221 (6) | |
C25 | 0.6398 (4) | 0.9230 (2) | 0.67913 (17) | 0.0255 (6) | |
C26 | 0.6508 (4) | 0.8769 (2) | 0.59356 (17) | 0.0256 (6) | |
C27 | 0.6308 (4) | 0.7142 (2) | 0.49162 (17) | 0.0233 (5) | |
C241 | 0.5978 (4) | 0.9089 (2) | 0.84602 (17) | 0.0232 (6) | |
H2A | 0.5942 | 0.4490 | 0.3250 | 0.054* | |
H2B | 0.7492 | 0.4576 | 0.3979 | 0.054* | |
H12 | 0.5448 | 0.4815 | 0.0760 | 0.029* | |
H13 | 0.5188 | 0.5687 | 0.2166 | 0.026* | |
H15 | 0.7225 | 0.8398 | 0.0946 | 0.026* | |
H16 | 0.7538 | 0.7422 | −0.0405 | 0.029* | |
H17 | 0.6502 | 0.6497 | 0.3434 | 0.025* | |
H22 | 0.5958 | 0.6242 | 0.6538 | 0.030* | |
H23 | 0.5824 | 0.7019 | 0.8000 | 0.027* | |
H25 | 0.6522 | 0.9990 | 0.6857 | 0.031* | |
H26 | 0.6727 | 0.9210 | 0.5412 | 0.031* | |
H27 | 0.6402 | 0.6380 | 0.4858 | 0.028* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0386 (11) | 0.0185 (8) | 0.0197 (9) | 0.0003 (8) | −0.0006 (9) | −0.0009 (7) |
O2 | 0.0515 (14) | 0.0247 (10) | 0.0309 (11) | −0.0013 (11) | −0.0159 (10) | 0.0035 (9) |
N11 | 0.0301 (12) | 0.0275 (11) | 0.0191 (10) | 0.0030 (10) | −0.0004 (10) | −0.0045 (9) |
N17 | 0.0294 (12) | 0.0185 (10) | 0.0141 (10) | 0.0006 (10) | −0.0023 (9) | −0.0016 (8) |
N24 | 0.0389 (14) | 0.0312 (12) | 0.0242 (12) | 0.0025 (12) | 0.0011 (11) | −0.0007 (11) |
N27 | 0.0254 (12) | 0.0256 (11) | 0.0144 (10) | 0.0000 (10) | −0.0014 (9) | −0.0027 (9) |
C12 | 0.0282 (14) | 0.0221 (12) | 0.0227 (13) | 0.0010 (12) | −0.0013 (11) | −0.0025 (11) |
C13 | 0.0252 (13) | 0.0215 (12) | 0.0172 (12) | −0.0007 (11) | −0.0004 (10) | 0.0008 (10) |
C14 | 0.0211 (13) | 0.0200 (12) | 0.0153 (11) | 0.0026 (10) | −0.0030 (10) | −0.0013 (10) |
C15 | 0.0289 (14) | 0.0195 (12) | 0.0170 (12) | 0.0009 (11) | −0.0008 (11) | 0.0031 (10) |
C16 | 0.0279 (14) | 0.0282 (14) | 0.0169 (12) | 0.0012 (12) | 0.0004 (11) | 0.0012 (11) |
C17 | 0.0191 (12) | 0.0188 (11) | 0.0143 (11) | −0.0005 (11) | 0.0002 (10) | 0.0006 (10) |
C21 | 0.0220 (13) | 0.0262 (13) | 0.0173 (12) | 0.0014 (11) | −0.0026 (10) | −0.0019 (10) |
C22 | 0.0286 (14) | 0.0209 (12) | 0.0251 (13) | −0.0003 (12) | −0.0017 (12) | 0.0024 (11) |
C23 | 0.0237 (13) | 0.0238 (13) | 0.0204 (13) | 0.0003 (11) | 0.0018 (12) | 0.0040 (10) |
C24 | 0.0219 (14) | 0.0247 (13) | 0.0196 (12) | 0.0012 (11) | −0.0042 (11) | −0.0011 (10) |
C25 | 0.0339 (16) | 0.0200 (12) | 0.0225 (12) | −0.0022 (11) | −0.0028 (12) | 0.0013 (10) |
C26 | 0.0324 (15) | 0.0241 (13) | 0.0203 (12) | −0.0017 (12) | −0.0040 (11) | 0.0052 (10) |
C27 | 0.0285 (14) | 0.0202 (12) | 0.0214 (12) | 0.0007 (11) | −0.0001 (11) | −0.0021 (11) |
C241 | 0.0251 (13) | 0.0235 (13) | 0.0210 (13) | −0.0001 (11) | 0.0003 (11) | 0.0040 (11) |
N11—C12 | 1.336 (3) | C27—C21 | 1.473 (4) |
N11—C16 | 1.344 (3) | C27—H27 | 0.95 |
C12—C13 | 1.387 (3) | C21—C22 | 1.393 (4) |
C12—H12 | 0.95 | C21—C26 | 1.399 (4) |
C13—C14 | 1.386 (4) | C22—C23 | 1.386 (4) |
C13—H13 | 0.95 | C22—H22 | 0.95 |
C14—C15 | 1.392 (3) | C23—C24 | 1.397 (3) |
C14—C17 | 1.505 (3) | C23—H23 | 0.95 |
C15—C16 | 1.383 (3) | C24—C25 | 1.398 (3) |
C15—H15 | 0.95 | C24—C241 | 1.445 (4) |
C16—H16 | 0.95 | C25—C26 | 1.372 (4) |
C17—O1 | 1.224 (3) | C25—H25 | 0.95 |
C17—N17 | 1.356 (3) | C26—H26 | 0.95 |
N17—N27 | 1.383 (3) | C241—N24 | 1.145 (3) |
N17—H17 | 0.90 | O2—H2A | 0.95 |
N27—C27 | 1.279 (3) | O2—H2B | 0.95 |
C12—N11—C16 | 117.0 (2) | N27—C27—C21 | 119.0 (2) |
N11—C12—C13 | 123.6 (2) | N27—C27—H27 | 120.5 |
N11—C12—H12 | 118.2 | C21—C27—H27 | 120.5 |
C13—C12—H12 | 118.2 | C22—C21—C26 | 119.6 (2) |
C14—C13—C12 | 118.8 (2) | C22—C21—C27 | 119.0 (2) |
C14—C13—H13 | 120.6 | C26—C21—C27 | 121.5 (2) |
C12—C13—H13 | 120.6 | C23—C22—C21 | 120.3 (2) |
C13—C14—C15 | 118.3 (2) | C23—C22—H22 | 119.8 |
C13—C14—C17 | 123.7 (2) | C21—C22—H22 | 119.8 |
C15—C14—C17 | 117.9 (2) | C22—C23—C24 | 119.7 (2) |
C16—C15—C14 | 118.7 (2) | C22—C23—H23 | 120.2 |
C16—C15—H15 | 120.7 | C24—C23—H23 | 120.2 |
C14—C15—H15 | 120.7 | C23—C24—C25 | 119.9 (2) |
N11—C16—C15 | 123.5 (2) | C23—C24—C241 | 121.0 (2) |
N11—C16—H16 | 118.2 | C25—C24—C241 | 119.2 (2) |
C15—C16—H16 | 118.2 | C26—C25—C24 | 120.2 (2) |
O1—C17—N17 | 124.3 (2) | C26—C25—H25 | 119.9 |
O1—C17—C14 | 121.1 (2) | C24—C25—H25 | 119.9 |
N17—C17—C14 | 114.6 (2) | C25—C26—C21 | 120.3 (2) |
C17—N17—N27 | 118.5 (2) | C25—C26—H26 | 119.8 |
C17—N17—H17 | 128.6 | C21—C26—H26 | 119.8 |
N27—N17—H17 | 112.3 | N24—C241—C24 | 179.6 (3) |
C27—N27—N17 | 115.5 (2) | H2A—O2—H2B | 106.0 |
C16—N11—C12—C13 | −1.6 (4) | C17—N17—N27—C27 | 179.0 (2) |
N11—C12—C13—C14 | 1.1 (4) | N17—N27—C27—C21 | 179.9 (2) |
C12—C13—C14—C15 | 0.9 (4) | N27—C27—C21—C22 | 168.0 (3) |
C12—C13—C14—C17 | 179.0 (2) | N27—C27—C21—C26 | −11.6 (4) |
C13—C14—C15—C16 | −2.2 (4) | C26—C21—C22—C23 | 2.0 (4) |
C17—C14—C15—C16 | 179.6 (2) | C27—C21—C22—C23 | −177.6 (2) |
C12—N11—C16—C15 | 0.2 (4) | C21—C22—C23—C24 | 0.6 (4) |
C14—C15—C16—N11 | 1.8 (4) | C22—C23—C24—C25 | −2.5 (4) |
C13—C14—C17—O1 | −152.4 (3) | C22—C23—C24—C241 | 178.7 (2) |
C15—C14—C17—O1 | 25.7 (4) | C23—C24—C25—C26 | 1.7 (4) |
C13—C14—C17—N17 | 28.8 (3) | C241—C24—C25—C26 | −179.5 (3) |
C15—C14—C17—N17 | −153.1 (2) | C24—C25—C26—C21 | 1.0 (4) |
O1—C17—N17—N27 | −2.1 (4) | C22—C21—C26—C25 | −2.8 (4) |
C14—C17—N17—N27 | 176.7 (2) | C27—C21—C26—C25 | 176.8 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
N17—H17···O2 | 0.90 | 1.95 | 2.845 (3) | 174 |
O2—H2A···O1i | 0.95 | 1.94 | 2.858 (3) | 162 |
O2—H2B···N11ii | 0.95 | 1.85 | 2.801 (3) | 174 |
C13—H13···O2 | 0.95 | 2.44 | 3.122 (3) | 129 |
C13—H13···O1i | 0.95 | 2.51 | 3.243 (3) | 134 |
Symmetry codes: (i) −x+1, y−1/2, −z+1/2; (ii) −x+3/2, −y+1, z+1/2. |
Experimental details
Crystal data | |
Chemical formula | C14H10N4O·H2O |
Mr | 268.28 |
Crystal system, space group | Orthorhombic, P212121 |
Temperature (K) | 120 |
a, b, c (Å) | 6.9692 (2), 12.3802 (5), 14.5513 (7) |
V (Å3) | 1255.49 (9) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.10 |
Crystal size (mm) | 0.62 × 0.04 × 0.03 |
Data collection | |
Diffractometer | Bruker–Nonius KappaCCD diffractometer |
Absorption correction | Multi-scan (SADABS; Sheldrick, 2003) |
Tmin, Tmax | 0.956, 0.997 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 14838, 1664, 1437 |
Rint | 0.069 |
(sin θ/λ)max (Å−1) | 0.650 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.045, 0.107, 1.06 |
No. of reflections | 1664 |
No. of parameters | 181 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.25, −0.20 |
Computer programs: COLLECT (Hooft, 1999), DENZO (Otwinowski & Minor, 1997) and COLLECT, DENZO and COLLECT, OSCAIL (McArdle, 2003) and SHELXS97 (Sheldrick, 1997), OSCAIL and SHELXL97 (Sheldrick, 1997), PLATON (Spek, 2003), SHELXL97 and PRPKAPPA (Ferguson, 1999).
C13—C14—C17—N17 | 28.8 (3) | N17—N27—C27—C21 | 179.9 (2) |
C14—C17—N17—N27 | 176.7 (2) | N27—C27—C21—C22 | 168.0 (3) |
C17—N17—N27—C27 | 179.0 (2) |
D—H···A | D—H | H···A | D···A | D—H···A |
N17—H17···O2 | 0.90 | 1.95 | 2.845 (3) | 174 |
O2—H2A···O1i | 0.95 | 1.94 | 2.858 (3) | 162 |
O2—H2B···N11ii | 0.95 | 1.85 | 2.801 (3) | 174 |
C13—H13···O2 | 0.95 | 2.44 | 3.122 (3) | 129 |
C13—H13···O1i | 0.95 | 2.51 | 3.243 (3) | 134 |
Symmetry codes: (i) −x+1, y−1/2, −z+1/2; (ii) −x+3/2, −y+1, z+1/2. |
Acknowledgements
X-ray data were collected at the EPSRC National Crystallography Service, University of Southampton; the authors thank the staff of the Service for all their help and advice. JLW thanks CNPq and FAPERJ for financial support.
References
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As part of a more general study of isonicotinoylhydrazones (Wardell, de Souza, Ferreira et al., 2005; Wardell, de Souza, Wardell et al., 2005; Wardell et al., 2006; Low et al., 2006), we report here the molecular and supramolecular structure of the title compound, (I) (Fig. 1), which was crystallized from damp ethanol as a stoichiometric monohydrate.
The central spacer unit of the hydrazone component, between atoms C14 and C21 (Fig. 1), is effectively planar with an all-trans extended-chain conformation, as shown by the key torsion angles (Table 1); the two rings, on the other hand, are each rotated out of this plane, so that the hydrazone molecules have no internal symmetry, and thus are chiral. While the bulk sample is racemic, in the absence of any inversion twinning, each crystal contains only a single enantiomer.
Within the selected asymmetric unit, the two independent molecular components are linked by an almost linear N—H···O hydrogen bond, weakly augmented by a C—H···O hydrogen bond (Fig. 1 and Table 1). These bimolecular units are then linked into a three-dimensional framework by one O—H···N hydrogen bond and by one O—H···O hydrogen bond, whose action may be weakly augmented by a second C—H···O hydrogen bond, although this augmentation is not essential to the framework formation. The formation of the framework is readily analysed in terms of three one-dimensional substructures, one formed by the inter-aggregate O—H···O hydrogen bond, one formed by the inter-aggregate O—H···N hydrogen bond and one involving both of these interactions. For the sake of simplicity we shall omit any further consideration of the C—H···O hydrogen bonds, which are both likely to be weak, and which do not influence the overall dimensionality of the supramolecular structure.
In the first substructure, water atom O2 at (x, y, z) acts as a hydrogen-bond donor, via H2A, to the carbonyl atom O1 at (1 - x, -1/2 + y, 1/2 - z), so forming a C22(6) (Bernstein et al., 1995) chain running parallel to the [010] direction and generated by the 21 screw axis along (1/2, y, 1/4) (Fig. 2). In the second substructure, water atom O2 at (x, y, z) acts as a hydrogen-bond donor, this time via H2B, to the pyridyl atom N11 at (3/2 - x, 1 - y, 1/2 + z), so forming a C22(9) chain running parallel to the [001] direction and generated by the 21 screw axis along (3/4, 1/2, z) (Fig. 3). Each of these two chains involves only one type of inter-aggregate hydrogen bond; the alternation of the two types of inter-aggregate hydrogen bond generates a C44(15) chain running parallel to the [100] direction (Fig. 4). The combination of the two chain motifs, along [100], [010] and [001], is sufficient to link all the molecules into a single three-dimensional framework structure.