organic compounds
2-Hydroxy-4-(prop-2-ynyloxy)benzaldehyde
aChemistry Research Centre, National Engineering College, K.R. Nagar, Kovilpatti 628 503, India, and bCAS in Crystallography and Biophysics, University of Madras, Guindy Campus, Chennai-25, India
*Correspondence e-mail: drmaneelakantan@gmail.com
The 10H8O3, contains two independent molecules, both of which are almost planar (r.m.s deviations for all non-H atoms of 0.044 and 0.053 Å). The dihedral angles between the benzene ring and the prop-1-yne group are 3.47 (1) and 3.07 (1)° in the two molecules, and the prop-1-yne groups adopt extended conformations. In each molecule, an intramolecular O—H⋯O hydrogen bond involving the OH and aldehyde substituents forms an S(6) ring. In the crystal, molecules are linked into cyclic centrosymmetric dimers via C—H⋯O hydrogen bonds, generating R22(14) ring motifs. The is further stabilized by aromatic π–π stacking interactions between the benzene rings [centroid–centroid distances = 3.813 (2) and 3.843 (2) Å]
of the title compound, CRelated literature
For the biological activity of benzaldehyde derivatives, see: Zhao et al. (2007); Ley & Bertram (2001); Delogu et al. (2010). For a related structure see: Esakkiammal et al. (2012). For standard bond lengths, see: Allen et al. (1987) and for hydrogen-bond motifs, see: Bernstein et al. (1995).
Experimental
Crystal data
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Data collection
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Refinement
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Data collection: APEX2 (Bruker, 2008); cell SAINT (Bruker, 2008); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 2012); software used to prepare material for publication: SHELXL97 and PLATON (Spek, 2009).
Supporting information
https://doi.org/10.1107/S1600536812049598/sj5285sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536812049598/sj5285Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S1600536812049598/sj5285Isup3.cml
Equimolar amounts of 3-bromopropyne (10 mmol), 2,4-dihydroxybenzaldehyde (10 mmol) and potassium carbonate (15 mmol) were suspended in acetonitrile (30 ml) and refluxed for 30 h in presence of KI (0.1 g) as a catalyst. The reaction mixture was filtered while hot to remove insoluble impurities, neutralized with dil.HCl (3 M), extracted with chloroform and dried with Na2SO4. The extracts were concentrated to obtain a brown solid which was then purified by
over SiO2 by eluting with a mixture of 4% ethyl acetate in n-hexane. Evaporation of the purified extract yielded 2-hydroxy-4-(prop-2-ynyloxy)benzaldehyde in the form of a pure white solid in 85% yield. Crystals suitable for X-ray analysis were obtined by the slow evaporation method.The acetylenic H atoms H10 and H20 were located in a difference Fourier map and refined freely. Other H atoms were positioned geometrically (C–H = 0.93–0.97 Å; O–H = 0.82 Å) and allowed to ride on their parent atoms, with Uiso(H) = 1.5Ueq(O) for hydroxyl H atoms and 1.2Ueq(C) for all other H atoms.
Schiff bases derived from
and substituted benzaldehydes exhibit antibacterial, anticancer and antitumour activities (Zhao et al., 2007). Several benzaldoximes, benzaldehyde-O-ethyloximes and acetophenone were synthesized and evaluated as tyrosinase inhibitors (Ley & Bertram, 2001). Bis-salicylaldehydes exhibited greater inhibitory activity than salicylaldehyde (Delogu et al., 2010). In view of these potential applications and in continuation of our work on the crystal structures of benzaldehyde derivatives, the structure of the title compound has been carried out and the results are presented here.X-ray analysis confirms the molecular structure and atom connectivity as illustrated in Fig. 1. The bond distances are normal (Allen et al., 1987) and are comparable with those found in related structures (Esakkiammal et al., 2012). The
contains two crystallographically independent molecules. In both molecules, the dihedral angles between the benzene rings and the prop-1-yne groups are 3.47 (1)° and 3.07 (1)°, respectively. Both molecules are almost planar, with r.m.s deviations of 0.044 and 0.053 Å from the best fit plane through all non-hydrogen atoms in the molecules. The prop-1-yne groups adopt extended conformations as can be seen from the torsion angles C15—O4—C18—C19 = -177.04 (12)° and C5—O1—C8—C9 = 179.39 (13)°. Atoms O2 and O5 deviate by 0.013 (1) and -0.004 (1) Å from the least squares plane of the benzene rings. Intramolecular O2–H2···O3 and O5–H5···O6 hydrogen bonds form S(6) rings in both molecules (Bernstein et al., 1995).Molecules are linked into cyclic centrosymmetric dimers via C–H···O hydrogen bonds with R22(14) ring motifs (Bernstein et al., 1995). The π–π stacking interaction between the benzene rings of adjacent molecules, with centroid to centroid distances Cg1···Cg2i = 3.813 (2) Å; Cg2···Cg1ii = 3.843 (2) Å [(i)1 - x, 1 - y,1 - z and (ii) 2 - x,1 - y,1 - z]. (Cg1 and Cg2 are the centroids of the C1—C6 and C11—C16 rings respectively).
is further stabilized by an aromaticFor the biological activity of benzaldehyde derivatives, see: Zhao et al. (2007); Ley & Bertram (2001); Delogu et al. (2010). For a related structure see: Esakkiammal et al. (2012). For standard bond lengths, see: Allen et al. (1987) and for hydrogen-bond motifs, see: Bernstein et al. (1995).
Data collection: APEX2 (Bruker, 2008); cell
SAINT (Bruker, 2008); data reduction: SAINT (Bruker, 2008); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 2012); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008) and PLATON (Spek, 2009).C10H8O3 | Z = 4 |
Mr = 176.16 | F(000) = 368 |
Triclinic, P1 | Dx = 1.346 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
a = 7.0835 (5) Å | Cell parameters from 4347 reflections |
b = 10.4059 (7) Å | θ = 1.7–28.4° |
c = 12.8461 (8) Å | µ = 0.10 mm−1 |
α = 73.910 (3)° | T = 293 K |
β = 89.756 (4)° | Block, colourless |
γ = 73.436 (4)° | 0.20 × 0.20 × 0.20 mm |
V = 869.16 (10) Å3 |
Bruker SMART APEXII area-detector diffractometer | 2880 reflections with I > 2σ(I) |
Radiation source: fine-focus sealed tube | Rint = 0.029 |
Graphite monochromator | θmax = 28.4°, θmin = 1.7° |
ω and φ scans | h = −9→9 |
15699 measured reflections | k = −13→13 |
4347 independent reflections | l = −17→17 |
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)] = 0.044 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.132 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.05 | w = 1/[σ2(Fo2) + (0.0595P)2 + 0.0997P] where P = (Fo2 + 2Fc2)/3 |
4347 reflections | (Δ/σ)max < 0.001 |
243 parameters | Δρmax = 0.15 e Å−3 |
0 restraints | Δρmin = −0.20 e Å−3 |
C10H8O3 | γ = 73.436 (4)° |
Mr = 176.16 | V = 869.16 (10) Å3 |
Triclinic, P1 | Z = 4 |
a = 7.0835 (5) Å | Mo Kα radiation |
b = 10.4059 (7) Å | µ = 0.10 mm−1 |
c = 12.8461 (8) Å | T = 293 K |
α = 73.910 (3)° | 0.20 × 0.20 × 0.20 mm |
β = 89.756 (4)° |
Bruker SMART APEXII area-detector diffractometer | 2880 reflections with I > 2σ(I) |
15699 measured reflections | Rint = 0.029 |
4347 independent reflections |
R[F2 > 2σ(F2)] = 0.044 | 0 restraints |
wR(F2) = 0.132 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.05 | Δρmax = 0.15 e Å−3 |
4347 reflections | Δρmin = −0.20 e Å−3 |
243 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 | ||
O4 | 0.23016 (15) | 0.81458 (9) | 0.55793 (7) | 0.0528 (3) | |
C14 | 0.2775 (2) | 0.69318 (13) | 0.41998 (10) | 0.0473 (3) | |
H14 | 0.3173 | 0.6058 | 0.4713 | 0.057* | |
O5 | 0.31664 (18) | 0.58412 (11) | 0.28152 (9) | 0.0699 (3) | |
H5 | 0.3065 | 0.6028 | 0.2151 | 0.105* | |
C16 | 0.1668 (2) | 0.94571 (13) | 0.37621 (11) | 0.0498 (3) | |
H16 | 0.1326 | 1.0264 | 0.3987 | 0.060* | |
C15 | 0.22699 (19) | 0.81361 (13) | 0.45238 (10) | 0.0423 (3) | |
C12 | 0.2087 (2) | 0.83519 (14) | 0.23261 (10) | 0.0473 (3) | |
O6 | 0.2396 (2) | 0.74928 (15) | 0.07950 (9) | 0.0831 (4) | |
C13 | 0.2683 (2) | 0.70387 (14) | 0.31045 (11) | 0.0467 (3) | |
C11 | 0.1590 (2) | 0.95453 (14) | 0.26846 (11) | 0.0511 (3) | |
H11 | 0.1196 | 1.0423 | 0.2175 | 0.061* | |
C18 | 0.2822 (3) | 0.68218 (15) | 0.63841 (11) | 0.0639 (4) | |
H18A | 0.4161 | 0.6290 | 0.6314 | 0.077* | |
H18B | 0.1940 | 0.6296 | 0.6284 | 0.077* | |
C19 | 0.2680 (2) | 0.70303 (15) | 0.74570 (12) | 0.0546 (4) | |
C17 | 0.1995 (2) | 0.84683 (19) | 0.11911 (12) | 0.0643 (4) | |
H17 | 0.1594 | 0.9367 | 0.0712 | 0.077* | |
C20 | 0.2593 (3) | 0.71369 (18) | 0.83353 (13) | 0.0652 (4) | |
O1 | 0.27472 (15) | 0.21006 (10) | 0.97384 (7) | 0.0556 (3) | |
C4 | 0.2102 (2) | 0.31928 (13) | 0.77968 (10) | 0.0480 (3) | |
H4 | 0.1643 | 0.4086 | 0.7881 | 0.058* | |
C6 | 0.3435 (2) | 0.06902 (13) | 0.85818 (11) | 0.0475 (3) | |
H6 | 0.3856 | −0.0081 | 0.9192 | 0.057* | |
C5 | 0.27430 (19) | 0.20366 (13) | 0.86926 (10) | 0.0426 (3) | |
C3 | 0.2154 (2) | 0.30031 (13) | 0.67725 (10) | 0.0458 (3) | |
C2 | 0.28516 (19) | 0.16624 (13) | 0.66383 (10) | 0.0442 (3) | |
C1 | 0.3487 (2) | 0.05198 (14) | 0.75674 (11) | 0.0480 (3) | |
H1 | 0.3956 | −0.0377 | 0.7491 | 0.058* | |
O2 | 0.15146 (18) | 0.41492 (10) | 0.59107 (7) | 0.0675 (3) | |
H2 | 0.1609 | 0.3914 | 0.5349 | 0.101* | |
O3 | 0.2389 (2) | 0.23901 (13) | 0.47217 (8) | 0.0756 (4) | |
C7 | 0.2915 (2) | 0.14587 (18) | 0.55809 (12) | 0.0594 (4) | |
H7 | 0.3396 | 0.0544 | 0.5542 | 0.071* | |
C9 | 0.2226 (2) | 0.32905 (16) | 1.10635 (12) | 0.0576 (4) | |
C8 | 0.2136 (3) | 0.34536 (16) | 0.99018 (12) | 0.0664 (4) | |
H8A | 0.0797 | 0.3946 | 0.9582 | 0.080* | |
H8B | 0.2996 | 0.3995 | 0.9556 | 0.080* | |
C10 | 0.2270 (3) | 0.3192 (2) | 1.19909 (14) | 0.0684 (5) | |
H10 | 0.230 (3) | 0.3082 (19) | 1.2682 (16) | 0.088 (6)* | |
H20 | 0.253 (2) | 0.7250 (17) | 0.9014 (15) | 0.078 (5)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O4 | 0.0719 (7) | 0.0437 (5) | 0.0408 (5) | −0.0109 (4) | 0.0031 (4) | −0.0153 (4) |
C14 | 0.0586 (8) | 0.0379 (6) | 0.0406 (7) | −0.0080 (6) | 0.0023 (6) | −0.0100 (5) |
O5 | 0.0999 (9) | 0.0533 (6) | 0.0531 (6) | −0.0056 (6) | 0.0018 (6) | −0.0275 (5) |
C16 | 0.0560 (8) | 0.0390 (7) | 0.0518 (8) | −0.0098 (6) | 0.0033 (6) | −0.0134 (6) |
C15 | 0.0445 (7) | 0.0427 (7) | 0.0397 (6) | −0.0110 (5) | 0.0038 (5) | −0.0137 (5) |
C12 | 0.0456 (7) | 0.0545 (8) | 0.0400 (7) | −0.0149 (6) | 0.0048 (6) | −0.0106 (6) |
O6 | 0.1047 (10) | 0.1030 (10) | 0.0461 (6) | −0.0269 (8) | 0.0113 (6) | −0.0326 (7) |
C13 | 0.0496 (8) | 0.0453 (7) | 0.0448 (7) | −0.0095 (6) | 0.0041 (6) | −0.0170 (6) |
C11 | 0.0547 (8) | 0.0428 (7) | 0.0473 (7) | −0.0116 (6) | 0.0008 (6) | −0.0025 (6) |
C18 | 0.0978 (12) | 0.0474 (8) | 0.0417 (7) | −0.0147 (8) | −0.0004 (7) | −0.0118 (6) |
C19 | 0.0653 (9) | 0.0533 (8) | 0.0459 (8) | −0.0192 (7) | 0.0014 (7) | −0.0134 (6) |
C17 | 0.0681 (10) | 0.0793 (11) | 0.0416 (8) | −0.0221 (8) | 0.0062 (7) | −0.0110 (8) |
C20 | 0.0841 (12) | 0.0716 (10) | 0.0446 (8) | −0.0277 (9) | 0.0068 (8) | −0.0195 (8) |
O1 | 0.0775 (7) | 0.0464 (5) | 0.0335 (5) | −0.0063 (5) | −0.0011 (4) | −0.0091 (4) |
C4 | 0.0655 (9) | 0.0367 (6) | 0.0382 (7) | −0.0110 (6) | −0.0009 (6) | −0.0093 (5) |
C6 | 0.0544 (8) | 0.0390 (6) | 0.0422 (7) | −0.0094 (6) | 0.0008 (6) | −0.0051 (5) |
C5 | 0.0475 (7) | 0.0426 (7) | 0.0342 (6) | −0.0106 (5) | 0.0010 (5) | −0.0083 (5) |
C3 | 0.0587 (8) | 0.0418 (7) | 0.0359 (6) | −0.0192 (6) | −0.0013 (6) | −0.0051 (5) |
C2 | 0.0495 (7) | 0.0477 (7) | 0.0412 (7) | −0.0213 (6) | 0.0059 (6) | −0.0150 (5) |
C1 | 0.0528 (8) | 0.0392 (7) | 0.0524 (8) | −0.0121 (6) | 0.0050 (6) | −0.0154 (6) |
O2 | 0.1155 (10) | 0.0468 (6) | 0.0338 (5) | −0.0239 (6) | −0.0080 (5) | −0.0015 (4) |
O3 | 0.1107 (10) | 0.0851 (8) | 0.0383 (6) | −0.0384 (7) | 0.0061 (6) | −0.0197 (6) |
C7 | 0.0737 (10) | 0.0662 (9) | 0.0500 (8) | −0.0290 (8) | 0.0105 (7) | −0.0264 (7) |
C9 | 0.0645 (10) | 0.0590 (9) | 0.0495 (8) | −0.0133 (7) | 0.0022 (7) | −0.0212 (7) |
C8 | 0.0962 (12) | 0.0514 (8) | 0.0438 (8) | −0.0067 (8) | 0.0006 (8) | −0.0167 (6) |
C10 | 0.0784 (12) | 0.0844 (12) | 0.0474 (9) | −0.0227 (9) | 0.0045 (8) | −0.0286 (8) |
O4—C15 | 1.3591 (14) | O1—C5 | 1.3634 (14) |
O4—C18 | 1.4237 (16) | O1—C8 | 1.4245 (16) |
C14—C15 | 1.3798 (17) | C4—C5 | 1.3797 (17) |
C14—C13 | 1.3806 (18) | C4—C3 | 1.3825 (18) |
C14—H14 | 0.9300 | C4—H4 | 0.9300 |
O5—C13 | 1.3493 (15) | C6—C1 | 1.3619 (18) |
O5—H5 | 0.8200 | C6—C5 | 1.3935 (17) |
C16—C11 | 1.3619 (18) | C6—H6 | 0.9300 |
C16—C15 | 1.3974 (17) | C3—O2 | 1.3481 (15) |
C16—H16 | 0.9300 | C3—C2 | 1.3999 (18) |
C12—C11 | 1.3944 (19) | C2—C1 | 1.3977 (18) |
C12—C13 | 1.4010 (19) | C2—C7 | 1.4304 (18) |
C12—C17 | 1.4295 (19) | C1—H1 | 0.9300 |
O6—C17 | 1.221 (2) | O2—H2 | 0.8200 |
C11—H11 | 0.9300 | O3—C7 | 1.2251 (19) |
C18—C19 | 1.4522 (19) | C7—H7 | 0.9300 |
C18—H18A | 0.9700 | C9—C10 | 1.167 (2) |
C18—H18B | 0.9700 | C9—C8 | 1.454 (2) |
C19—C20 | 1.164 (2) | C8—H8A | 0.9700 |
C17—H17 | 0.9300 | C8—H8B | 0.9700 |
C20—H20 | 0.911 (18) | C10—H10 | 0.862 (19) |
C15—O4—C18 | 116.91 (10) | C5—O1—C8 | 117.38 (10) |
C15—C14—C13 | 119.27 (12) | C5—C4—C3 | 119.00 (12) |
C15—C14—H14 | 120.4 | C5—C4—H4 | 120.5 |
C13—C14—H14 | 120.4 | C3—C4—H4 | 120.5 |
C13—O5—H5 | 109.5 | C1—C6—C5 | 119.09 (11) |
C11—C16—C15 | 118.97 (12) | C1—C6—H6 | 120.5 |
C11—C16—H16 | 120.5 | C5—C6—H6 | 120.5 |
C15—C16—H16 | 120.5 | O1—C5—C4 | 123.96 (11) |
O4—C15—C14 | 123.91 (11) | O1—C5—C6 | 114.78 (10) |
O4—C15—C16 | 115.03 (11) | C4—C5—C6 | 121.26 (12) |
C14—C15—C16 | 121.06 (12) | O2—C3—C4 | 117.85 (12) |
C11—C12—C13 | 118.41 (12) | O2—C3—C2 | 121.27 (11) |
C11—C12—C17 | 120.70 (13) | C4—C3—C2 | 120.88 (12) |
C13—C12—C17 | 120.89 (13) | C1—C2—C3 | 118.26 (11) |
O5—C13—C14 | 117.79 (12) | C1—C2—C7 | 120.55 (12) |
O5—C13—C12 | 121.53 (12) | C3—C2—C7 | 121.19 (12) |
C14—C13—C12 | 120.67 (12) | C6—C1—C2 | 121.50 (12) |
C16—C11—C12 | 121.62 (12) | C6—C1—H1 | 119.2 |
C16—C11—H11 | 119.2 | C2—C1—H1 | 119.2 |
C12—C11—H11 | 119.2 | C3—O2—H2 | 109.5 |
O4—C18—C19 | 109.46 (11) | O3—C7—C2 | 125.35 (14) |
O4—C18—H18A | 109.8 | O3—C7—H7 | 117.3 |
C19—C18—H18A | 109.8 | C2—C7—H7 | 117.3 |
O4—C18—H18B | 109.8 | C10—C9—C8 | 178.40 (17) |
C19—C18—H18B | 109.8 | O1—C8—C9 | 108.67 (12) |
H18A—C18—H18B | 108.2 | O1—C8—H8A | 110.0 |
C20—C19—C18 | 177.13 (16) | C9—C8—H8A | 110.0 |
O6—C17—C12 | 125.79 (15) | O1—C8—H8B | 110.0 |
O6—C17—H17 | 117.1 | C9—C8—H8B | 110.0 |
C12—C17—H17 | 117.1 | H8A—C8—H8B | 108.3 |
C19—C20—H20 | 178.1 (11) | C9—C10—H10 | 177.5 (13) |
C18—O4—C15—C14 | −2.4 (2) | C8—O1—C5—C4 | −3.0 (2) |
C18—O4—C15—C16 | 177.32 (13) | C8—O1—C5—C6 | 177.38 (12) |
C13—C14—C15—O4 | 179.71 (12) | C3—C4—C5—O1 | −179.63 (12) |
C13—C14—C15—C16 | 0.0 (2) | C3—C4—C5—C6 | 0.0 (2) |
C11—C16—C15—O4 | −179.91 (12) | C1—C6—C5—O1 | 180.00 (12) |
C11—C16—C15—C14 | −0.2 (2) | C1—C6—C5—C4 | 0.4 (2) |
C15—C14—C13—O5 | −179.31 (12) | C5—C4—C3—O2 | 179.81 (13) |
C15—C14—C13—C12 | 0.0 (2) | C5—C4—C3—C2 | −0.3 (2) |
C11—C12—C13—O5 | 179.36 (13) | O2—C3—C2—C1 | −179.83 (13) |
C17—C12—C13—O5 | −0.9 (2) | C4—C3—C2—C1 | 0.3 (2) |
C11—C12—C13—C14 | 0.0 (2) | O2—C3—C2—C7 | 0.1 (2) |
C17—C12—C13—C14 | 179.81 (13) | C4—C3—C2—C7 | −179.79 (13) |
C15—C16—C11—C12 | 0.3 (2) | C5—C6—C1—C2 | −0.4 (2) |
C13—C12—C11—C16 | −0.2 (2) | C3—C2—C1—C6 | 0.1 (2) |
C17—C12—C11—C16 | −179.99 (13) | C7—C2—C1—C6 | −179.87 (13) |
C15—O4—C18—C19 | −177.04 (12) | C1—C2—C7—O3 | 179.84 (15) |
O4—C18—C19—C20 | −179 (100) | C3—C2—C7—O3 | −0.1 (2) |
C11—C12—C17—O6 | −179.95 (16) | C5—O1—C8—C9 | 179.39 (13) |
C13—C12—C17—O6 | 0.3 (3) | C10—C9—C8—O1 | −162 (7) |
D—H···A | D—H | H···A | D···A | D—H···A |
O2—H2···O3 | 0.82 | 1.92 | 2.6387 (16) | 146 |
O5—H5···O6 | 0.82 | 1.93 | 2.6441 (16) | 146 |
C10—H10···O3i | 0.86 (2) | 2.51 (2) | 3.369 (2) | 171.4 (2) |
C18—H18A···O5ii | 0.97 | 2.45 | 3.281 (2) | 144 |
C20—H20···O6i | 0.91 (2) | 2.37 (2) | 3.280 (2) | 178.8 (2) |
Symmetry codes: (i) x, y, z+1; (ii) −x+1, −y+1, −z+1. |
Experimental details
Crystal data | |
Chemical formula | C10H8O3 |
Mr | 176.16 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 293 |
a, b, c (Å) | 7.0835 (5), 10.4059 (7), 12.8461 (8) |
α, β, γ (°) | 73.910 (3), 89.756 (4), 73.436 (4) |
V (Å3) | 869.16 (10) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.10 |
Crystal size (mm) | 0.20 × 0.20 × 0.20 |
Data collection | |
Diffractometer | Bruker SMART APEXII area-detector |
Absorption correction | – |
No. of measured, independent and observed [I > 2σ(I)] reflections | 15699, 4347, 2880 |
Rint | 0.029 |
(sin θ/λ)max (Å−1) | 0.669 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.044, 0.132, 1.05 |
No. of reflections | 4347 |
No. of parameters | 243 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.15, −0.20 |
Computer programs: APEX2 (Bruker, 2008), SAINT (Bruker, 2008), SHELXS97 (Sheldrick, 2008), ORTEP-3 (Farrugia, 2012), SHELXL97 (Sheldrick, 2008) and PLATON (Spek, 2009).
D—H···A | D—H | H···A | D···A | D—H···A |
O2—H2···O3 | 0.82 | 1.92 | 2.6387 (16) | 146 |
O5—H5···O6 | 0.82 | 1.93 | 2.6441 (16) | 146 |
C10—H10···O3i | 0.86 (2) | 2.51 (2) | 3.369 (2) | 171.4 (2) |
C18—H18A···O5ii | 0.97 | 2.45 | 3.281 (2) | 144 |
C20—H20···O6i | 0.91 (2) | 2.37 (2) | 3.280 (2) | 178.8 (2) |
Symmetry codes: (i) x, y, z+1; (ii) −x+1, −y+1, −z+1. |
Acknowledgements
VS and DV thank the TBI X-ray facility, CAS in Crystallography and Biophysics, University of Madras, India, for the data collection and the UGC SAP for the facilities provided to the department.
References
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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.
Schiff bases derived from amines and substituted benzaldehydes exhibit antibacterial, anticancer and antitumour activities (Zhao et al., 2007). Several benzaldoximes, benzaldehyde-O-ethyloximes and acetophenone oximes were synthesized and evaluated as tyrosinase inhibitors (Ley & Bertram, 2001). Bis-salicylaldehydes exhibited greater inhibitory activity than salicylaldehyde (Delogu et al., 2010). In view of these potential applications and in continuation of our work on the crystal structures of benzaldehyde derivatives, the structure of the title compound has been carried out and the results are presented here.
X-ray analysis confirms the molecular structure and atom connectivity as illustrated in Fig. 1. The bond distances are normal (Allen et al., 1987) and are comparable with those found in related structures (Esakkiammal et al., 2012). The asymmetric unit contains two crystallographically independent molecules. In both molecules, the dihedral angles between the benzene rings and the prop-1-yne groups are 3.47 (1)° and 3.07 (1)°, respectively. Both molecules are almost planar, with r.m.s deviations of 0.044 and 0.053 Å from the best fit plane through all non-hydrogen atoms in the molecules. The prop-1-yne groups adopt extended conformations as can be seen from the torsion angles C15—O4—C18—C19 = -177.04 (12)° and C5—O1—C8—C9 = 179.39 (13)°. Atoms O2 and O5 deviate by 0.013 (1) and -0.004 (1) Å from the least squares plane of the benzene rings. Intramolecular O2–H2···O3 and O5–H5···O6 hydrogen bonds form S(6) rings in both molecules (Bernstein et al., 1995).
Molecules are linked into cyclic centrosymmetric dimers via C–H···O hydrogen bonds with R22(14) ring motifs (Bernstein et al., 1995). The crystal structure is further stabilized by an aromatic π–π stacking interaction between the benzene rings of adjacent molecules, with centroid to centroid distances Cg1···Cg2i = 3.813 (2) Å; Cg2···Cg1ii = 3.843 (2) Å [(i)1 - x, 1 - y,1 - z and (ii) 2 - x,1 - y,1 - z]. (Cg1 and Cg2 are the centroids of the C1—C6 and C11—C16 rings respectively).