organic compounds
Dicyclohexylammonium 2-methoxybenzoate
aDepartment of Chemistry, Laboratory of General and Inorganic Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, HR-10000 Zagreb, Croatia, and bDepartment of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, PO Box 180, HR-10002 Zagreb, Croatia
*Correspondence e-mail: judas@chem.pmf.hr
The 12H24N+·C8H7O3−, contains one dicyclohexylammonium cation and one 2-methoxybenzoate anion. Two cations and two anions are linked together to form a four-ion cluster through a set of N—H⋯O hydrogen bonds. Weak C—H⋯O hydrogen bonds connect the clusters into chains that are stacked along the crystallographic c axis.
of the title compound, CRelated literature
For the crystal structures of dicyclohexylammonium salts of monocarboxylic acids, see: Ng et al. (1999); Ng, Naumov et al. 2001), Ng & Hook (1999); Subramanian et al. (2000). For the crystal structures of dicyclohexylammonium salts of dicarboxylic acids, see: Ballabh et al. (2005); Trivedi et al. (2005); Ng, Chantrapromma et al. (2001). For related literature, see: Zain & Ng (2007); Trivedi et al. (2004); Ng et al. (1991); Allen et al. (1987).
Experimental
Crystal data
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Data collection
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Refinement
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Data collection: CrysAlis CCD (Oxford Diffraction, 2003); cell CrysAlis RED (Oxford Diffraction, 2003); data reduction: CrysAlis RED; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997), Mercury (Macrae et al., 2006), RasTop (Valadon, 2000–2003) and POV-RAY (Persistence of Vision, 2004); software used to prepare material for publication: WinGX (Farrugia, 1999).
Supporting information
10.1107/S1600536808007587/wn2244sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536808007587/wn2244Isup2.hkl
A solution of dicyclohexylamine (363 mg, 2.00 mmol) in toluene (5 ml) was added with stirring to a solution of 2-methoxybenzoic acid (304 mg, 2.00 mmol) in toluene (5 ml). The resulting solution was allowed to stand in an open beaker for several days until crystals of the title compound formed by slow solvent evaporation. The crystals were suitable for single-crystal X-ray diffraction. The compound was also analyzed by thermal methods (TG and DSC). Thermal analyses were performed on METTLER
modules DSC823e and TGA/SDTA851e. The calorimetric thermogram exhibited one endothermic signal that was sharp and well defined, corresponding to the melting point of the compound. The onset temperature of the signal is Tf = 416 K with of fusion, ΔHfus = 37,9 kJ mol-1. Degradation of the sample begins above 524 K.Carbon-bound H atoms were placed in calculated positions and included in the
using the riding-model approximation, with C—H distances of 0.93 Å for phenyl, 0.97 Å for methylene, 0.98 Å for methine and 0.96 Å for methyl groups, and with Uiso(H) = 1.2Ueq(C) or 1.2Ueq(Cmethyl). A rotating group model was used for the methyl groups. The hydrogen atoms of the amine group were located in the final Fourier difference map and their coordinates were blocked during the process.Data collection: CrysAlis CCD (Oxford Diffraction, 2003); cell
CrysAlis RED (Oxford Diffraction, 2003); data reduction: CrysAlis RED (Oxford Diffraction, 2003); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); Mercury (Macrae et al., 2006); RasTop (Valadon, 2000–2003); POV-RAY (Persistence of Vision, 2004); software used to prepare material for publication: WinGX (Farrugia, 1999).C12H24N+·C8H7O3− | F(000) = 728 |
Mr = 333.46 | Dx = 1.141 Mg m−3 |
Monoclinic, P21/c | Melting point: 416 K |
Hall symbol: -P 2ybc | Mo Kα radiation, λ = 0.71073 Å |
a = 9.2798 (5) Å | Cell parameters from 742 reflections |
b = 17.7978 (9) Å | θ = 6.4–21.2° |
c = 12.1513 (7) Å | µ = 0.08 mm−1 |
β = 104.720 (5)° | T = 293 K |
V = 1941.04 (18) Å3 | Prismatic, colourless |
Z = 4 | 0.62 × 0.41 × 0.35 mm |
Oxford Diffraction Xcalibur CCD diffractometer | 2750 reflections with I > 2σ(I) |
Radiation source: fine-focus sealed tube | Rint = 0.042 |
Graphite monochromator | θmax = 26.0°, θmin = 4.1° |
ω scans | h = −11→11 |
19673 measured reflections | k = −21→21 |
3789 independent reflections | l = −14→14 |
Refinement on F2 | Secondary atom site location: difference Fourier map |
Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.068 | H atoms treated by a mixture of independent and constrained refinement |
wR(F2) = 0.175 | w = 1/[σ2(Fo2) + (0.0745P)2 + 0.785P] where P = (Fo2 + 2Fc2)/3 |
S = 1.03 | (Δ/σ)max < 0.001 |
3789 reflections | Δρmax = 0.37 e Å−3 |
225 parameters | Δρmin = −0.17 e Å−3 |
0 restraints | Extinction correction: SHELXL, Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
Primary atom site location: structure-invariant direct methods | Extinction coefficient: 0.034 (4) |
C12H24N+·C8H7O3− | V = 1941.04 (18) Å3 |
Mr = 333.46 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 9.2798 (5) Å | µ = 0.08 mm−1 |
b = 17.7978 (9) Å | T = 293 K |
c = 12.1513 (7) Å | 0.62 × 0.41 × 0.35 mm |
β = 104.720 (5)° |
Oxford Diffraction Xcalibur CCD diffractometer | 2750 reflections with I > 2σ(I) |
19673 measured reflections | Rint = 0.042 |
3789 independent reflections |
R[F2 > 2σ(F2)] = 0.068 | 0 restraints |
wR(F2) = 0.175 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.03 | Δρmax = 0.37 e Å−3 |
3789 reflections | Δρmin = −0.17 e Å−3 |
225 parameters |
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes. |
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > σ(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. |
x | y | z | Uiso*/Ueq | ||
O1 | 0.2706 (2) | 0.08567 (10) | 1.00183 (17) | 0.0842 (6) | |
O2 | 0.04537 (19) | 0.13445 (12) | 0.96352 (17) | 0.0852 (6) | |
O3 | 0.0699 (2) | 0.14787 (12) | 0.72365 (14) | 0.0819 (6) | |
N1 | 0.2059 (2) | −0.06289 (11) | 1.02163 (16) | 0.0491 (5) | |
H1 | 0.114 (3) | −0.0780 (13) | 1.0175 (19) | 0.059* | |
H2 | 0.209 (2) | −0.0112 (15) | 1.0178 (19) | 0.059* | |
C1 | 0.1749 (2) | 0.13270 (11) | 0.95593 (17) | 0.0471 (5) | |
C2 | 0.2251 (2) | 0.19520 (11) | 0.89133 (17) | 0.0438 (5) | |
C3 | 0.3308 (3) | 0.24641 (13) | 0.9464 (2) | 0.0634 (6) | |
H3 | 0.3731 | 0.2413 | 1.0241 | 0.076* | |
C4 | 0.3748 (4) | 0.30529 (15) | 0.8877 (3) | 0.0898 (10) | |
H4 | 0.4465 | 0.3392 | 0.9258 | 0.108* | |
C5 | 0.3122 (4) | 0.31337 (16) | 0.7736 (3) | 0.0894 (10) | |
H5 | 0.3400 | 0.3535 | 0.7345 | 0.107* | |
C6 | 0.2088 (3) | 0.26265 (16) | 0.7164 (2) | 0.0750 (8) | |
H6 | 0.1671 | 0.2682 | 0.6388 | 0.090* | |
C7 | 0.1666 (2) | 0.20300 (13) | 0.77480 (19) | 0.0537 (6) | |
C8 | 0.0317 (4) | 0.1435 (2) | 0.6036 (2) | 0.0992 (11) | |
H8B | −0.0221 | 0.1878 | 0.5722 | 0.149* | |
H8C | −0.0295 | 0.1000 | 0.5795 | 0.149* | |
H8A | 0.1208 | 0.1395 | 0.5776 | 0.149* | |
C9 | 0.2458 (2) | −0.09394 (12) | 0.91808 (18) | 0.0507 (5) | |
H9 | 0.3437 | −0.0742 | 0.9162 | 0.061* | |
C10 | 0.1326 (3) | −0.06616 (16) | 0.8135 (2) | 0.0761 (7) | |
H10A | 0.1324 | −0.0117 | 0.8129 | 0.091* | |
H10B | 0.0340 | −0.0830 | 0.8159 | 0.091* | |
C11 | 0.1681 (4) | −0.09527 (19) | 0.7053 (2) | 0.0940 (10) | |
H11B | 0.0913 | −0.0787 | 0.6397 | 0.113* | |
H11A | 0.2622 | −0.0742 | 0.6992 | 0.113* | |
C12 | 0.1775 (4) | −0.17925 (19) | 0.7044 (3) | 0.0950 (10) | |
H12B | 0.2082 | −0.1956 | 0.6377 | 0.114* | |
H12A | 0.0800 | −0.2005 | 0.7005 | 0.114* | |
C13 | 0.2877 (5) | −0.2071 (2) | 0.8103 (3) | 0.1075 (11) | |
H13A | 0.3869 | −0.1911 | 0.8086 | 0.129* | |
H13B | 0.2865 | −0.2616 | 0.8106 | 0.129* | |
C14 | 0.2540 (3) | −0.17841 (14) | 0.9200 (2) | 0.0760 (8) | |
H14B | 0.1600 | −0.1991 | 0.9271 | 0.091* | |
H14A | 0.3316 | −0.1948 | 0.9852 | 0.091* | |
C15 | 0.3019 (2) | −0.08294 (11) | 1.13645 (17) | 0.0471 (5) | |
H15 | 0.2968 | −0.1374 | 1.1467 | 0.057* | |
C16 | 0.2390 (2) | −0.04421 (14) | 1.2256 (2) | 0.0599 (6) | |
H16A | 0.2334 | 0.0094 | 1.2110 | 0.072* | |
H16B | 0.1386 | −0.0623 | 1.2194 | 0.072* | |
C17 | 0.3332 (3) | −0.05828 (17) | 1.3448 (2) | 0.0743 (7) | |
H17B | 0.3262 | −0.1109 | 1.3637 | 0.089* | |
H17A | 0.2947 | −0.0287 | 1.3981 | 0.089* | |
C18 | 0.4956 (3) | −0.03803 (17) | 1.3571 (2) | 0.0755 (7) | |
H18A | 0.5047 | 0.0159 | 1.3490 | 0.091* | |
H18B | 0.5541 | −0.0522 | 1.4323 | 0.091* | |
C19 | 0.5553 (3) | −0.07794 (15) | 1.2679 (2) | 0.0717 (7) | |
H19B | 0.6573 | −0.0623 | 1.2748 | 0.086* | |
H19A | 0.5555 | −0.1317 | 1.2812 | 0.086* | |
C20 | 0.4629 (2) | −0.06121 (14) | 1.1488 (2) | 0.0594 (6) | |
H20A | 0.5021 | −0.0890 | 1.0941 | 0.071* | |
H20B | 0.4689 | −0.0080 | 1.1329 | 0.071* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.1052 (14) | 0.0553 (11) | 0.1037 (15) | 0.0129 (10) | 0.0479 (12) | 0.0276 (10) |
O2 | 0.0615 (10) | 0.1125 (16) | 0.0879 (14) | −0.0220 (10) | 0.0307 (9) | 0.0165 (11) |
O3 | 0.0777 (11) | 0.1234 (17) | 0.0406 (9) | −0.0256 (11) | 0.0079 (8) | −0.0009 (9) |
N1 | 0.0455 (9) | 0.0437 (10) | 0.0621 (12) | 0.0020 (8) | 0.0210 (8) | 0.0081 (8) |
C1 | 0.0600 (12) | 0.0460 (12) | 0.0374 (11) | −0.0104 (10) | 0.0166 (9) | −0.0060 (9) |
C2 | 0.0455 (10) | 0.0423 (11) | 0.0465 (12) | 0.0037 (8) | 0.0168 (9) | 0.0004 (8) |
C3 | 0.0789 (16) | 0.0585 (14) | 0.0571 (14) | −0.0167 (12) | 0.0252 (12) | −0.0057 (11) |
C4 | 0.121 (2) | 0.0557 (16) | 0.108 (3) | −0.0344 (16) | 0.056 (2) | −0.0122 (15) |
C5 | 0.127 (3) | 0.0545 (16) | 0.108 (3) | 0.0052 (17) | 0.068 (2) | 0.0244 (16) |
C6 | 0.0877 (18) | 0.0762 (18) | 0.0692 (17) | 0.0236 (15) | 0.0344 (14) | 0.0327 (14) |
C7 | 0.0502 (11) | 0.0625 (14) | 0.0503 (13) | 0.0092 (10) | 0.0164 (10) | 0.0082 (10) |
C8 | 0.091 (2) | 0.152 (3) | 0.0475 (16) | 0.004 (2) | 0.0051 (14) | −0.0046 (18) |
C9 | 0.0505 (11) | 0.0522 (12) | 0.0529 (13) | −0.0041 (9) | 0.0196 (10) | 0.0033 (9) |
C10 | 0.0922 (19) | 0.0692 (17) | 0.0626 (17) | 0.0069 (14) | 0.0116 (14) | 0.0055 (13) |
C11 | 0.125 (3) | 0.091 (2) | 0.0612 (18) | −0.0079 (19) | 0.0165 (17) | 0.0017 (15) |
C12 | 0.121 (3) | 0.093 (2) | 0.071 (2) | −0.0183 (19) | 0.0259 (18) | −0.0164 (17) |
C13 | 0.164 (3) | 0.078 (2) | 0.088 (2) | 0.027 (2) | 0.046 (2) | −0.0125 (17) |
C14 | 0.107 (2) | 0.0544 (15) | 0.0715 (18) | 0.0130 (14) | 0.0313 (15) | 0.0015 (12) |
C15 | 0.0506 (11) | 0.0382 (10) | 0.0542 (13) | 0.0017 (8) | 0.0165 (10) | 0.0060 (9) |
C16 | 0.0547 (12) | 0.0597 (14) | 0.0712 (16) | −0.0047 (10) | 0.0268 (11) | −0.0068 (11) |
C17 | 0.0851 (18) | 0.0795 (18) | 0.0591 (16) | −0.0140 (14) | 0.0200 (13) | −0.0135 (13) |
C18 | 0.0735 (16) | 0.0733 (17) | 0.0737 (18) | −0.0050 (13) | 0.0074 (13) | −0.0142 (14) |
C19 | 0.0571 (13) | 0.0656 (16) | 0.0864 (19) | 0.0069 (12) | 0.0071 (13) | −0.0050 (14) |
C20 | 0.0476 (11) | 0.0629 (14) | 0.0698 (16) | 0.0050 (10) | 0.0189 (11) | 0.0007 (11) |
O1—C1 | 1.244 (3) | C11—C12 | 1.498 (5) |
O2—C1 | 1.229 (3) | C11—H11B | 0.9700 |
O3—C7 | 1.368 (3) | C11—H11A | 0.9700 |
O3—C8 | 1.413 (3) | C12—C13 | 1.510 (5) |
N1—C15 | 1.495 (3) | C12—H12B | 0.9700 |
N1—C9 | 1.504 (3) | C12—H12A | 0.9700 |
N1—H1 | 0.88 (2) | C13—C14 | 1.532 (4) |
N1—H2 | 0.92 (3) | C13—H13A | 0.9700 |
C1—C2 | 1.502 (3) | C13—H13B | 0.9700 |
C2—C3 | 1.381 (3) | C14—H14B | 0.9700 |
C2—C7 | 1.389 (3) | C14—H14A | 0.9700 |
C3—C4 | 1.386 (4) | C15—C20 | 1.513 (3) |
C3—H3 | 0.9300 | C15—C16 | 1.520 (3) |
C4—C5 | 1.368 (4) | C15—H15 | 0.9800 |
C4—H4 | 0.9300 | C16—C17 | 1.511 (3) |
C5—C6 | 1.371 (4) | C16—H16A | 0.9700 |
C5—H5 | 0.9300 | C16—H16B | 0.9700 |
C6—C7 | 1.387 (3) | C17—C18 | 1.520 (4) |
C6—H6 | 0.9300 | C17—H17B | 0.9700 |
C8—H8B | 0.9600 | C17—H17A | 0.9700 |
C8—H8C | 0.9600 | C18—C19 | 1.513 (4) |
C8—H8A | 0.9600 | C18—H18A | 0.9700 |
C9—C14 | 1.505 (3) | C18—H18B | 0.9700 |
C9—C10 | 1.511 (3) | C19—C20 | 1.513 (3) |
C9—H9 | 0.9800 | C19—H19B | 0.9700 |
C10—C11 | 1.526 (4) | C19—H19A | 0.9700 |
C10—H10A | 0.9700 | C20—H20A | 0.9700 |
C10—H10B | 0.9700 | C20—H20B | 0.9700 |
C7—O3—C8 | 118.2 (2) | C11—C12—H12B | 109.5 |
C15—N1—C9 | 118.55 (16) | C13—C12—H12B | 109.5 |
C15—N1—H1 | 108.5 (15) | C11—C12—H12A | 109.5 |
C9—N1—H1 | 106.2 (15) | C13—C12—H12A | 109.5 |
C15—N1—H2 | 105.4 (14) | H12B—C12—H12A | 108.1 |
C9—N1—H2 | 107.8 (14) | C12—C13—C14 | 112.8 (3) |
H1—N1—H2 | 110 (2) | C12—C13—H13A | 109.0 |
O2—C1—O1 | 125.7 (2) | C14—C13—H13A | 109.0 |
O2—C1—C2 | 117.3 (2) | C12—C13—H13B | 109.0 |
O1—C1—C2 | 116.86 (18) | C14—C13—H13B | 109.0 |
C3—C2—C7 | 118.3 (2) | H13A—C13—H13B | 107.8 |
C3—C2—C1 | 120.77 (19) | C9—C14—C13 | 109.9 (2) |
C7—C2—C1 | 120.94 (18) | C9—C14—H14B | 109.7 |
C2—C3—C4 | 121.0 (3) | C13—C14—H14B | 109.7 |
C2—C3—H3 | 119.5 | C9—C14—H14A | 109.7 |
C4—C3—H3 | 119.5 | C13—C14—H14A | 109.7 |
C5—C4—C3 | 119.8 (3) | H14B—C14—H14A | 108.2 |
C5—C4—H4 | 120.1 | N1—C15—C20 | 111.74 (17) |
C3—C4—H4 | 120.1 | N1—C15—C16 | 108.11 (17) |
C4—C5—C6 | 120.4 (2) | C20—C15—C16 | 111.23 (18) |
C4—C5—H5 | 119.8 | N1—C15—H15 | 108.6 |
C6—C5—H5 | 119.8 | C20—C15—H15 | 108.6 |
C5—C6—C7 | 119.8 (3) | C16—C15—H15 | 108.6 |
C5—C6—H6 | 120.1 | C17—C16—C15 | 112.00 (19) |
C7—C6—H6 | 120.1 | C17—C16—H16A | 109.2 |
O3—C7—C6 | 123.7 (2) | C15—C16—H16A | 109.2 |
O3—C7—C2 | 115.66 (19) | C17—C16—H16B | 109.2 |
C6—C7—C2 | 120.6 (2) | C15—C16—H16B | 109.2 |
O3—C8—H8B | 109.5 | H16A—C16—H16B | 107.9 |
O3—C8—H8C | 109.5 | C16—C17—C18 | 111.9 (2) |
H8B—C8—H8C | 109.5 | C16—C17—H17B | 109.2 |
O3—C8—H8A | 109.5 | C18—C17—H17B | 109.2 |
H8B—C8—H8A | 109.5 | C16—C17—H17A | 109.2 |
H8C—C8—H8A | 109.5 | C18—C17—H17A | 109.2 |
N1—C9—C14 | 112.10 (18) | H17B—C17—H17A | 107.9 |
N1—C9—C10 | 108.46 (18) | C19—C18—C17 | 110.6 (2) |
C14—C9—C10 | 111.2 (2) | C19—C18—H18A | 109.5 |
N1—C9—H9 | 108.3 | C17—C18—H18A | 109.5 |
C14—C9—H9 | 108.3 | C19—C18—H18B | 109.5 |
C10—C9—H9 | 108.3 | C17—C18—H18B | 109.5 |
C9—C10—C11 | 110.9 (2) | H18A—C18—H18B | 108.1 |
C9—C10—H10A | 109.5 | C20—C19—C18 | 111.8 (2) |
C11—C10—H10A | 109.5 | C20—C19—H19B | 109.3 |
C9—C10—H10B | 109.5 | C18—C19—H19B | 109.3 |
C11—C10—H10B | 109.5 | C20—C19—H19A | 109.3 |
H10A—C10—H10B | 108.0 | C18—C19—H19A | 109.3 |
C12—C11—C10 | 111.7 (3) | H19B—C19—H19A | 107.9 |
C12—C11—H11B | 109.3 | C19—C20—C15 | 110.46 (19) |
C10—C11—H11B | 109.3 | C19—C20—H20A | 109.6 |
C12—C11—H11A | 109.3 | C15—C20—H20A | 109.6 |
C10—C11—H11A | 109.3 | C19—C20—H20B | 109.6 |
H11B—C11—H11A | 107.9 | C15—C20—H20B | 109.6 |
C11—C12—C13 | 110.5 (3) | H20A—C20—H20B | 108.1 |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H2···O1 | 0.92 (3) | 1.84 (3) | 2.735 (3) | 163 (2) |
N1—H1···O2i | 0.88 (2) | 1.85 (3) | 2.703 (2) | 162 (2) |
C20—H20A···O1ii | 0.97 | 2.66 | 3.457 (3) | 140 |
Symmetry codes: (i) −x, −y, −z+2; (ii) −x+1, −y, −z+2. |
Experimental details
Crystal data | |
Chemical formula | C12H24N+·C8H7O3− |
Mr | 333.46 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 293 |
a, b, c (Å) | 9.2798 (5), 17.7978 (9), 12.1513 (7) |
β (°) | 104.720 (5) |
V (Å3) | 1941.04 (18) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.08 |
Crystal size (mm) | 0.62 × 0.41 × 0.35 |
Data collection | |
Diffractometer | Oxford Diffraction Xcalibur CCD diffractometer |
Absorption correction | – |
No. of measured, independent and observed [I > 2σ(I)] reflections | 19673, 3789, 2750 |
Rint | 0.042 |
(sin θ/λ)max (Å−1) | 0.617 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.068, 0.175, 1.03 |
No. of reflections | 3789 |
No. of parameters | 225 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.37, −0.17 |
Computer programs: CrysAlis CCD (Oxford Diffraction, 2003), CrysAlis RED (Oxford Diffraction, 2003), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 for Windows (Farrugia, 1997); Mercury (Macrae et al., 2006); RasTop (Valadon, 2000–2003); POV-RAY (Persistence of Vision, 2004), WinGX (Farrugia, 1999).
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H2···O1 | 0.92 (3) | 1.84 (3) | 2.735 (3) | 163 (2) |
N1—H1···O2i | 0.88 (2) | 1.85 (3) | 2.703 (2) | 162 (2) |
C20—H20A···O1ii | 0.97 | 2.66 | 3.457 (3) | 140.1 |
Symmetry codes: (i) −x, −y, −z+2; (ii) −x+1, −y, −z+2. |
Acknowledgements
Financial support by the Ministry of Science, Education and Sport of the Republic of Croatia is gratefully acknowledged (grant Nos. 098–0982914-2935 and 119–1193079-1084).
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This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
The title compound was synthesized as a model for the purposes of a workshop on parallel synthesis and combinatorial chemistry. The compound was selected because of its resemblance to dicyclohexylammonium salts of substituted cinnamic acids, that are widely known as gelators of organic fluids (Ballabh et al., 2005; Trivedi et al., 2005, Trivedi et al., 2004).
The molecular structure of the title compound is shown in Fig. 1. The asymmetric unit consist of a dicyclohexylammonium cation and a 2-methoxybenzoate anion. The carboxylate group of the anion is twisted with respect to the parent benzene ring by 65.1 (2)°. All bond lengths fall within normal ranges (Allen et al., 1987).
Two cations and two anions self-assemble into a tetrameric structural unit by two hydrogen bonds; N1—H2···O1 and N1—H1···O2i (Fig. 2, Table 1.).
Weak C20—H20···O1ii hydrogen bonds (Fig. 3, Table 1) link these tetrameric units into chains that are stacked together in a zipper-like manner, so as to produce narrow channels between them (Fig. 4a). The appearance of the channels is consistent with the relatively low calculated density of the title compound (1.14 g cm-3).
The zipper-like stacking is achieved by the interdigitation of protruding benzene groups in each chain (Fig. 4 b), thus maximizing the intermolecular contacts.