organic compounds
(E)-2-[(2-Ethylphenyl)iminomethyl]-6-methoxyphenol
aDepartment of Physics, Faculty of Arts and Sciences, Ondokuz Mayıs University, TR-55139 Kurupelit–Samsun, Turkey, bSinop Faculty of Education, Sinop University, TR-57000 Sinop, Turkey, and cDepartment of Chemistry, Ondokuz Mayıs University, TR-55139 Kurupelit–Samsun, Turkey
*Correspondence e-mail: yserap@omu.edu.tr
The molecule of the title compound, C16H17NO2, adopts the phenol–imine tautomeric form with a strong intramolecular O—H⋯N hydrogen bond and an E conformation with respect to the azomethine C=N bond. The dihedral angle between the aromatic rings is 21.23 (9)°. The ethyl group is disordered over two orientations with occupancies of 0.598 (6) and 0.402 (6). In the crystal, the molecules are linked into chains along the b axis by C—H⋯π interactions.
Related literature
For general background to o-hydroxy see: Stewart & Lingafelter (1959); Calligaris et al. (1972); Maslen & Waters (1975). For the photochromic and thermochromic characteristics of Schiff base compounds, see: Cohen et al. (1964); Moustakali-Mavridis et al. (1980); Hadjoudis et al. (1987); Xu et al. (1994). For a related structure, see: Yüce et al. (2004).
Experimental
Crystal data
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Refinement
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Data collection: X-AREA (Stoe & Cie, 2002); cell X-AREA; data reduction: X-RED32 (Stoe & Cie, 2002); 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); software used to prepare material for publication: WinGX (Farrugia, 1999).
Supporting information
https://doi.org/10.1107/S1600536809055573/ci5005sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536809055573/ci5005Isup2.hkl
A solution of 3-methoxysalicylaldehyde (0.5 g 3.3 mmol) in ethanol (20 ml) was added to a solution of 2-ethylaniline (0.4 g 3.3 mmol) in ethanol (20 ml). The reaction mixture was stirred for 1 h under reflux. Single crystals of the title compound were obtained by slow evaporation of an ethanol solution (yield 72%, m.p. 339-340 K).
The ethyl group is disordered over two orientations with occupancies of 0.598 (6) and 0.402 (6). Atom H1 was located in a difference map and refined freely. The remaining H atoms were placed in calculated positions and constrained to ride on their parents atoms, with C-H = 0.93–0.96 Å and Uiso(H) = 1.2Ueq(C) and 1.5Ueq(Cmethyl).
o-Hydroxy
derived from the reaction of o-hydroxyaldehydes with aniline have been examined extensively (Steward & Lingafelter, 1959; Calligaris et al., 1972; Maslen & Waters, 1975). Schiff base compounds display interesting photochromic and thermochromic features and can be classified in terms of these (Cohen et al., 1964; Moustakali-Mavridis et al., 1980; Hadjoudis et al., 1987). Photo- and thermochromism arise via H atom transfer from the hydroxy O atom to the N atom (Hadjoudis et al., 1987; Xu et al., 1994).The molecule of the title compound (Fig. 1) exists in the phenol-imine form which is confirmed by C13—O1 and C7—N1 bond distances. These distances agree with the corresponding distances in 1-{4-[(2-hydroxybenzylidene)amino]phenyl}ethanone, a related structure [C—O = 1.3500 (17) and C—N = 1.2772 (16) Å; Yüce et al., 2004].
The title molecule is not planar; the dihedral angle between the two benzene rings is 21.23 (9)°. An intramolecular O1—H1···N1 hydrogen bond (Fig. 1) generates an S(6) ring-motif.
The π interactions involving H14C and C8–C13 ring (Fig. 2).
is stabilized by weak C—H···For general background to o-hydroxy
see: Steward & Lingafelter (1959); Calligaris et al. (1972); Maslen & Waters (1975). For the photochromic and thermochromic characteristics of Schiff base compounds, see: Cohen et al. (1964); Moustakali-Mavridis et al. (1980); Hadjoudis et al. (1987); Xu et al. (1994). For a related structure, see: Yüce et al. (2004).Data collection: X-AREA (Stoe & Cie, 2002); cell
X-AREA (Stoe & Cie, 2002); data reduction: X-RED32 (Stoe & Cie, 2002); 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); software used to prepare material for publication: WinGX (Farrugia, 1999).C16H17NO2 | F(000) = 544 |
Mr = 255.31 | Dx = 1.293 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 2353 reflections |
a = 18.2379 (7) Å | θ = 1.5–28.0° |
b = 5.2044 (2) Å | µ = 0.09 mm−1 |
c = 15.0950 (7) Å | T = 150 K |
β = 113.788 (3)° | Plate, brown |
V = 1311.05 (9) Å3 | 0.58 × 0.39 × 0.08 mm |
Z = 4 |
Stoe IPDS II diffractometer | 3014 independent reflections |
Radiation source: fine-focus sealed tube | 2353 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.072 |
Detector resolution: 6.67 pixels mm-1 | θmax = 27.6°, θmin = 2.4° |
ω scan | h = −23→23 |
Absorption correction: integration (X-RED32; Stoe & Cie, 2002) | k = −6→6 |
Tmin = 0.961, Tmax = 0.993 | l = −19→19 |
18335 measured reflections |
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)] = 0.044 | H atoms treated by a mixture of independent and constrained refinement |
wR(F2) = 0.115 | w = 1/[σ2(Fo2) + (0.052P)2 + 0.279P] where P = (Fo2 + 2Fc2)/3 |
S = 1.03 | (Δ/σ)max = 0.001 |
3014 reflections | Δρmax = 0.26 e Å−3 |
196 parameters | Δρmin = −0.32 e Å−3 |
0 restraints | Extinction correction: SHELXL97 (Sheldrick, 2008), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
Primary atom site location: structure-invariant direct methods | Extinction coefficient: 0.024 (3) |
C16H17NO2 | V = 1311.05 (9) Å3 |
Mr = 255.31 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 18.2379 (7) Å | µ = 0.09 mm−1 |
b = 5.2044 (2) Å | T = 150 K |
c = 15.0950 (7) Å | 0.58 × 0.39 × 0.08 mm |
β = 113.788 (3)° |
Stoe IPDS II diffractometer | 3014 independent reflections |
Absorption correction: integration (X-RED32; Stoe & Cie, 2002) | 2353 reflections with I > 2σ(I) |
Tmin = 0.961, Tmax = 0.993 | Rint = 0.072 |
18335 measured reflections |
R[F2 > 2σ(F2)] = 0.044 | 0 restraints |
wR(F2) = 0.115 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.03 | Δρmax = 0.26 e Å−3 |
3014 reflections | Δρmin = −0.32 e Å−3 |
196 parameters |
Experimental. 320 frames, detector distance = 100 mm |
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 | Occ. (<1) | |
C16A | 0.0701 (3) | 0.3212 (10) | 0.5111 (3) | 0.0532 (15) | 0.402 (6) |
H16A | 0.0628 | 0.3425 | 0.5702 | 0.080* | 0.402 (6) |
H16B | 0.0188 | 0.3027 | 0.4581 | 0.080* | 0.402 (6) |
H16C | 0.0970 | 0.4691 | 0.5006 | 0.080* | 0.402 (6) |
C15A | 0.1206 (3) | 0.0813 (10) | 0.5183 (4) | 0.0411 (12) | 0.402 (6) |
H15A | 0.0944 | −0.0727 | 0.5274 | 0.049* | 0.402 (6) |
H15B | 0.1734 | 0.0953 | 0.5705 | 0.049* | 0.402 (6) |
C15B | 0.09657 (17) | 0.2040 (7) | 0.4866 (2) | 0.0380 (9) | 0.598 (6) |
H15C | 0.1114 | 0.3839 | 0.4967 | 0.046* | 0.598 (6) |
H15D | 0.0388 | 0.1903 | 0.4639 | 0.046* | 0.598 (6) |
C16B | 0.13777 (19) | 0.0531 (6) | 0.5796 (3) | 0.0470 (9) | 0.598 (6) |
H16D | 0.1220 | 0.1202 | 0.6285 | 0.070* | 0.598 (6) |
H16E | 0.1948 | 0.0681 | 0.6009 | 0.070* | 0.598 (6) |
H16F | 0.1226 | −0.1244 | 0.5682 | 0.070* | 0.598 (6) |
H1 | 0.2630 (14) | 0.462 (4) | 0.5862 (17) | 0.077 (7)* | |
O1 | 0.29046 (6) | 0.5645 (2) | 0.64484 (7) | 0.0387 (3) | |
N1 | 0.23740 (7) | 0.3745 (3) | 0.47070 (8) | 0.0376 (3) | |
C12 | 0.38182 (8) | 0.9118 (3) | 0.68144 (9) | 0.0314 (3) | |
O2 | 0.37858 (6) | 0.9107 (2) | 0.77070 (7) | 0.0386 (3) | |
C9 | 0.38032 (8) | 0.8881 (3) | 0.49637 (10) | 0.0344 (3) | |
H9 | 0.3798 | 0.8812 | 0.4345 | 0.041* | |
C13 | 0.33418 (7) | 0.7266 (3) | 0.61589 (9) | 0.0306 (3) | |
C8 | 0.33213 (7) | 0.7187 (3) | 0.52183 (9) | 0.0315 (3) | |
C14 | 0.42206 (9) | 1.1110 (3) | 0.83509 (10) | 0.0406 (3) | |
H14A | 0.4162 | 1.0939 | 0.8952 | 0.061* | |
H14B | 0.4015 | 1.2747 | 0.8066 | 0.061* | |
H14C | 0.4777 | 1.0989 | 0.8468 | 0.061* | |
C11 | 0.42846 (8) | 1.0776 (3) | 0.65443 (10) | 0.0338 (3) | |
H11 | 0.4602 | 1.1993 | 0.6982 | 0.041* | |
C7 | 0.27988 (8) | 0.5403 (3) | 0.45018 (10) | 0.0346 (3) | |
H7 | 0.2772 | 0.5468 | 0.3874 | 0.042* | |
C2 | 0.20659 (9) | 0.1179 (3) | 0.32266 (10) | 0.0407 (3) | |
H2 | 0.2493 | 0.1925 | 0.3133 | 0.049* | |
C10 | 0.42817 (8) | 1.0634 (3) | 0.56190 (10) | 0.0347 (3) | |
H10 | 0.4605 | 1.1732 | 0.5447 | 0.042* | |
C3 | 0.16088 (10) | −0.0684 (3) | 0.25904 (11) | 0.0474 (4) | |
H3 | 0.1729 | −0.1186 | 0.2073 | 0.057* | |
C1 | 0.18945 (8) | 0.1950 (3) | 0.40048 (10) | 0.0378 (3) | |
C4 | 0.09745 (10) | −0.1796 (3) | 0.27231 (11) | 0.0479 (4) | |
H4 | 0.0666 | −0.3053 | 0.2298 | 0.057* | |
C6 | 0.12496 (10) | 0.0848 (4) | 0.41384 (13) | 0.0594 (5) | |
C5 | 0.08014 (10) | −0.1034 (4) | 0.34882 (13) | 0.0568 (5) | |
H5 | 0.0373 | −0.1794 | 0.3575 | 0.068* |
U11 | U22 | U33 | U12 | U13 | U23 | |
C16A | 0.049 (2) | 0.056 (3) | 0.061 (3) | 0.001 (2) | 0.028 (2) | −0.013 (2) |
C15A | 0.041 (2) | 0.041 (3) | 0.043 (4) | −0.007 (2) | 0.019 (2) | 0.004 (2) |
C15B | 0.0310 (13) | 0.0355 (19) | 0.0482 (16) | 0.0008 (13) | 0.0168 (12) | 0.0063 (14) |
C16B | 0.0583 (17) | 0.0449 (16) | 0.042 (2) | −0.0002 (13) | 0.0248 (15) | 0.0062 (13) |
O1 | 0.0388 (5) | 0.0449 (6) | 0.0382 (5) | −0.0100 (5) | 0.0216 (4) | −0.0055 (5) |
N1 | 0.0279 (5) | 0.0472 (7) | 0.0369 (6) | −0.0015 (5) | 0.0124 (5) | −0.0066 (5) |
C12 | 0.0324 (6) | 0.0346 (7) | 0.0296 (6) | 0.0033 (6) | 0.0151 (5) | 0.0015 (5) |
O2 | 0.0447 (5) | 0.0440 (6) | 0.0327 (5) | −0.0101 (5) | 0.0214 (4) | −0.0068 (4) |
C9 | 0.0384 (7) | 0.0358 (7) | 0.0318 (6) | 0.0057 (6) | 0.0169 (6) | 0.0043 (5) |
C13 | 0.0271 (6) | 0.0332 (7) | 0.0338 (6) | 0.0025 (5) | 0.0146 (5) | 0.0020 (5) |
C8 | 0.0290 (6) | 0.0337 (7) | 0.0315 (6) | 0.0053 (5) | 0.0117 (5) | 0.0016 (5) |
C14 | 0.0491 (8) | 0.0413 (9) | 0.0362 (7) | −0.0070 (7) | 0.0220 (6) | −0.0083 (6) |
C11 | 0.0358 (7) | 0.0316 (7) | 0.0345 (7) | −0.0002 (6) | 0.0148 (6) | 0.0000 (6) |
C7 | 0.0307 (6) | 0.0404 (8) | 0.0318 (6) | 0.0055 (6) | 0.0116 (5) | −0.0002 (6) |
C2 | 0.0402 (7) | 0.0450 (9) | 0.0350 (7) | −0.0007 (6) | 0.0132 (6) | −0.0004 (6) |
C10 | 0.0381 (7) | 0.0329 (7) | 0.0372 (7) | 0.0013 (6) | 0.0193 (6) | 0.0050 (6) |
C3 | 0.0531 (9) | 0.0507 (10) | 0.0350 (7) | −0.0020 (8) | 0.0143 (7) | −0.0054 (7) |
C1 | 0.0299 (6) | 0.0454 (9) | 0.0340 (7) | −0.0001 (6) | 0.0088 (5) | −0.0047 (6) |
C4 | 0.0426 (8) | 0.0488 (9) | 0.0396 (8) | −0.0027 (7) | 0.0035 (6) | −0.0058 (7) |
C6 | 0.0407 (8) | 0.0860 (14) | 0.0566 (10) | −0.0213 (9) | 0.0248 (8) | −0.0273 (10) |
C5 | 0.0376 (8) | 0.0732 (13) | 0.0584 (10) | −0.0174 (8) | 0.0180 (8) | −0.0171 (9) |
C16A—C15A | 1.529 (7) | C9—C10 | 1.370 (2) |
C16A—H16A | 0.96 | C9—C8 | 1.4035 (19) |
C16A—H16B | 0.96 | C9—H9 | 0.93 |
C16A—H16C | 0.96 | C13—C8 | 1.4058 (17) |
C15A—C6 | 1.611 (5) | C8—C7 | 1.4521 (19) |
C15A—H15A | 0.97 | C14—H14A | 0.96 |
C15A—H15B | 0.97 | C14—H14B | 0.96 |
C15B—C16B | 1.516 (5) | C14—H14C | 0.96 |
C15B—C6 | 1.523 (3) | C11—C10 | 1.3966 (18) |
C15B—H15C | 0.97 | C11—H11 | 0.93 |
C15B—H15D | 0.97 | C7—H7 | 0.93 |
C16B—H16D | 0.96 | C2—C3 | 1.382 (2) |
C16B—H16E | 0.96 | C2—C1 | 1.391 (2) |
C16B—H16F | 0.96 | C2—H2 | 0.93 |
O1—C13 | 1.3490 (16) | C10—H10 | 0.93 |
O1—H1 | 0.98 (2) | C3—C4 | 1.378 (2) |
N1—C7 | 1.2781 (19) | C3—H3 | 0.93 |
N1—C1 | 1.4193 (18) | C1—C6 | 1.394 (2) |
C12—O2 | 1.3722 (15) | C4—C5 | 1.373 (2) |
C12—C11 | 1.3834 (19) | C4—H4 | 0.93 |
C12—C13 | 1.4034 (19) | C6—C5 | 1.394 (2) |
O2—C14 | 1.4274 (17) | C5—H5 | 0.93 |
C15A—C16A—H16A | 109.5 | C9—C8—C7 | 119.54 (12) |
C15A—C16A—H16B | 109.5 | C13—C8—C7 | 120.87 (12) |
H16A—C16A—H16B | 109.5 | O2—C14—H14A | 109.5 |
C15A—C16A—H16C | 109.5 | O2—C14—H14B | 109.5 |
H16A—C16A—H16C | 109.5 | H14A—C14—H14B | 109.5 |
H16B—C16A—H16C | 109.5 | O2—C14—H14C | 109.5 |
C16A—C15A—C6 | 100.8 (4) | H14A—C14—H14C | 109.5 |
C16A—C15A—H15A | 111.6 | H14B—C14—H14C | 109.5 |
C6—C15A—H15A | 111.6 | C12—C11—C10 | 120.47 (13) |
C16A—C15A—H15B | 111.6 | C12—C11—H11 | 119.8 |
C6—C15A—H15B | 111.6 | C10—C11—H11 | 119.8 |
H15A—C15A—H15B | 109.4 | N1—C7—C8 | 122.06 (12) |
C16B—C15B—C6 | 105.7 (3) | N1—C7—H7 | 119.0 |
C16B—C15B—H15C | 110.6 | C8—C7—H7 | 119.0 |
C6—C15B—H15C | 110.6 | C3—C2—C1 | 120.71 (14) |
C16B—C15B—H15D | 110.6 | C3—C2—H2 | 119.6 |
C6—C15B—H15D | 110.6 | C1—C2—H2 | 119.6 |
H15C—C15B—H15D | 108.7 | C9—C10—C11 | 120.11 (13) |
C15B—C16B—H16D | 109.5 | C9—C10—H10 | 119.9 |
C15B—C16B—H16E | 109.5 | C11—C10—H10 | 119.9 |
H16D—C16B—H16E | 109.5 | C4—C3—C2 | 120.00 (14) |
C15B—C16B—H16F | 109.5 | C4—C3—H3 | 120.0 |
H16D—C16B—H16F | 109.5 | C2—C3—H3 | 120.0 |
H16E—C16B—H16F | 109.5 | C2—C1—C6 | 119.58 (14) |
C13—O1—H1 | 101.6 (13) | C2—C1—N1 | 122.67 (13) |
C7—N1—C1 | 120.97 (12) | C6—C1—N1 | 117.68 (13) |
O2—C12—C11 | 124.55 (12) | C5—C4—C3 | 119.48 (15) |
O2—C12—C13 | 115.46 (11) | C5—C4—H4 | 120.3 |
C11—C12—C13 | 119.99 (12) | C3—C4—H4 | 120.3 |
C12—O2—C14 | 115.69 (10) | C5—C6—C1 | 118.45 (15) |
C10—C9—C8 | 120.50 (12) | C5—C6—C15B | 121.37 (16) |
C10—C9—H9 | 119.7 | C1—C6—C15B | 119.27 (17) |
C8—C9—H9 | 119.7 | C5—C6—C15A | 115.8 (2) |
O1—C13—C12 | 118.68 (11) | C1—C6—C15A | 121.60 (19) |
O1—C13—C8 | 122.03 (12) | C4—C5—C6 | 121.78 (16) |
C12—C13—C8 | 119.27 (12) | C4—C5—H5 | 119.1 |
C9—C8—C13 | 119.58 (12) | C6—C5—H5 | 119.1 |
C11—C12—O2—C14 | 5.35 (19) | C3—C2—C1—N1 | 176.31 (14) |
C13—C12—O2—C14 | −175.41 (12) | C7—N1—C1—C2 | 25.3 (2) |
O2—C12—C13—O1 | −0.49 (18) | C7—N1—C1—C6 | −157.73 (16) |
C11—C12—C13—O1 | 178.79 (12) | C2—C3—C4—C5 | 0.2 (3) |
O2—C12—C13—C8 | 178.24 (11) | C2—C1—C6—C5 | 0.9 (3) |
C11—C12—C13—C8 | −2.48 (19) | N1—C1—C6—C5 | −176.19 (17) |
C10—C9—C8—C13 | −1.1 (2) | C2—C1—C6—C15B | −168.4 (2) |
C10—C9—C8—C7 | 177.95 (13) | N1—C1—C6—C15B | 14.5 (3) |
O1—C13—C8—C9 | −178.51 (12) | C2—C1—C6—C15A | 156.9 (3) |
C12—C13—C8—C9 | 2.80 (19) | N1—C1—C6—C15A | −20.1 (4) |
O1—C13—C8—C7 | 2.45 (19) | C16B—C15B—C6—C5 | 95.4 (3) |
C12—C13—C8—C7 | −176.23 (12) | C16B—C15B—C6—C1 | −95.6 (3) |
O2—C12—C11—C10 | 179.66 (13) | C16B—C15B—C6—C15A | 7.7 (3) |
C13—C12—C11—C10 | 0.4 (2) | C16A—C15A—C6—C5 | −108.3 (3) |
C1—N1—C7—C8 | −177.25 (12) | C16A—C15A—C6—C1 | 95.1 (3) |
C9—C8—C7—N1 | 176.91 (13) | C16A—C15A—C6—C15B | 0.4 (3) |
C13—C8—C7—N1 | −4.1 (2) | C3—C4—C5—C6 | 0.1 (3) |
C8—C9—C10—C11 | −1.0 (2) | C1—C6—C5—C4 | −0.7 (3) |
C12—C11—C10—C9 | 1.3 (2) | C15B—C6—C5—C4 | 168.4 (2) |
C1—C2—C3—C4 | 0.1 (3) | C15A—C6—C5—C4 | −158.1 (3) |
C3—C2—C1—C6 | −0.6 (3) |
Cg1 is the centroid of the C8–C13 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1···N1 | 0.98 (2) | 1.68 (2) | 2.6023 (15) | 156 (2) |
C14—H14c···Cg1i | 0.96 | 2.83 | 3.6241 (18) | 141 |
Symmetry code: (i) −x+1, y+1/2, −z+3/2. |
Experimental details
Crystal data | |
Chemical formula | C16H17NO2 |
Mr | 255.31 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 150 |
a, b, c (Å) | 18.2379 (7), 5.2044 (2), 15.0950 (7) |
β (°) | 113.788 (3) |
V (Å3) | 1311.05 (9) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.09 |
Crystal size (mm) | 0.58 × 0.39 × 0.08 |
Data collection | |
Diffractometer | Stoe IPDS II |
Absorption correction | Integration (X-RED32; Stoe & Cie, 2002) |
Tmin, Tmax | 0.961, 0.993 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 18335, 3014, 2353 |
Rint | 0.072 |
(sin θ/λ)max (Å−1) | 0.651 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.044, 0.115, 1.03 |
No. of reflections | 3014 |
No. of parameters | 196 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.26, −0.32 |
Computer programs: X-AREA (Stoe & Cie, 2002), X-RED32 (Stoe & Cie, 2002), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 for Windows (Farrugia, 1997), WinGX (Farrugia, 1999).
Cg1 is the centroid of the C8–C13 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1···N1 | 0.98 (2) | 1.68 (2) | 2.6023 (15) | 156 (2) |
C14—H14c···Cg1i | 0.96 | 2.83 | 3.6241 (18) | 141 |
Symmetry code: (i) −x+1, y+1/2, −z+3/2. |
Acknowledgements
The authors acknowledge the Faculty of Arts and Sciences, Ondokuz Mayıs University, Turkey, for the use of the Stoe IPDS II diffractometer (purchased under grant No. F279 of the University Research Fund).
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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.
o-Hydroxy Schiff bases derived from the reaction of o-hydroxyaldehydes with aniline have been examined extensively (Steward & Lingafelter, 1959; Calligaris et al., 1972; Maslen & Waters, 1975). Schiff base compounds display interesting photochromic and thermochromic features and can be classified in terms of these (Cohen et al., 1964; Moustakali-Mavridis et al., 1980; Hadjoudis et al., 1987). Photo- and thermochromism arise via H atom transfer from the hydroxy O atom to the N atom (Hadjoudis et al., 1987; Xu et al., 1994).
The molecule of the title compound (Fig. 1) exists in the phenol-imine form which is confirmed by C13—O1 and C7—N1 bond distances. These distances agree with the corresponding distances in 1-{4-[(2-hydroxybenzylidene)amino]phenyl}ethanone, a related structure [C—O = 1.3500 (17) and C—N = 1.2772 (16) Å; Yüce et al., 2004].
The title molecule is not planar; the dihedral angle between the two benzene rings is 21.23 (9)°. An intramolecular O1—H1···N1 hydrogen bond (Fig. 1) generates an S(6) ring-motif.
The crystal structure is stabilized by weak C—H···π interactions involving H14C and C8–C13 ring (Fig. 2).