organic compounds
(E)-2-[3-(Trifluoromethyl)phenyliminomethyl]benzene-1,4-diol
aDepartment of Physics, Faculty of Arts and Sciences, Ondokuz Mayıs University, Kurupelit, TR-55139 Samsun, Turkey, and bDepartment of Chemistry, Faculty of Arts and Sciences, Ondokuz Mayıs University, TR-55139 Samsun, Turkey
*Correspondence e-mail: sgul@omu.edu.tr
In the title compound, C14H10F3NO2, the two benzene rings are oriented at a dihedral angle of 31.94 (14)°. An intramolecular O—H⋯N hydrogen bond helps to stabilize the molecular structure. In the crystal, intermolecular O—H⋯O hydrogen bonding links the molecules, forming chains running along the crystallographic a axis. The F atoms of the trifluoromethyl group are disordered over two positions with refined site occupancies of 0.488 (5) and 0.512 (5).
Related literature
For the biological properties of et al. (1975). For Schiff base see: Şahin et al. (2005); Hadjoudis et al. (1987). For the structure of a similar compound, see: Temel et al. (2007). For classification of hydrogen-bonding patterns, see: Bernstein et al. (1995). For related structural studies of see: (Gül et al., 2007; Şahin et al., 2009a,b,c).
see: LozierExperimental
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/S1600536809041610/xu2631sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536809041610/xu2631Isup2.hkl
The compound (E)-2-[(3-(trifluoromethyl)phenylimino)methyl]-4-hydroxyphenol was prepared by reflux a mixture of a solution containing 2,5-dihydroxybenzaldehyde (0.0184 g, 0.13 mmol) in 20 ml ethanol and a solution containing 3- trifluoromethylaniline (0.0214 g, 0.13 mmol) in 20 ml ethanol. The reaction mixture was stirred for 1 h under reflux. The crystals of (E)-2-[(3-(trifluoromethyl)phenylimino)methyl]-4-hydroxyphenol suitable for X-ray analysis were obtained from ethylalcohol by slow evaporation (yield % 76; m.p. 404–407 K).
The H1 atom was located in a difference map and refined freely (distances given in Table 1). All other H atoms were placed in calculated positions and constrained to ride on their parents atoms, with C—H=0.93Å and 0.82Å (hydroxyl) and Uiso(H)=1.2Ueq(C) and 1.2Ueq(O). Fluorine atoms are disordered over two alternative positions with refined site occupancies of 0.488 (5) and 0.512 (5).
The present work is part of a structral study of
(Gül et al., 2007; Şahin et al., 2009a,b,c) and we report here the structure of (E)-2-[(3- (trifluoromethyl) phenylimino)methyl]-4-hydroxyphenol,(I). The molecular structure of (I) is shown in Figure 1.Schiff bases often exhibit various biological activities and in many cases were shown to have antibacterial, anticancer, anti-inflammatory and antitoxic properties (Lozier et al., 1975). There are two types of intramolecular hydrogen bonds in
which may be stabilized either in keto-amine (N—H···O hydrogen bond) (Şahin et al., 2005) or phenol-imine (N···H—O hydrogen bond) tautomeric forms (Hadjoudis et al., 1987). The H1 atom in title compound (I) is located on O1 atom, thus the phenol-imine tautomer is favored over the keto-amine form, as indicated by the C5—O1 [1.365 (5) Å], C7—N1 [1.281 (6) Å], C6—C7 [1.448 (6) Å], C5—C6 [1.399 (6) Å] bond lengths. The O1···N1 distance of 2.569 (5)Å is comparable to those observed for analogous hydrogen bond in (E)-3-[2-(Trifluoromethyl)phenyliminomethyl]- benzene-1,2-diol [2.568 (3) Å; Temel et al., 2007]. The N1—C7 [1.281 (6) Å] bond length is consistent with significant double-bond character of these bonds. It is known that may exhibit thermochromism or depending on the planarity or non-planarity of the molecule, respectively. Therefore, one can expect photochromic properties in (I) caused by non-planarity of the molecules; the dihedral angle the aromatic rings 31.94 (14)°. Molecules are linked into sheets by a combination of O—H···O hydrogen bonds (Table 1). Atom O2 in the acts as hydrogen-bond donor, via H2, connecting this molecule to O1 in a symmetry related molecule at (1 + x,y,z), forming a C(7) chain running parallel to the [100] direction (Fig. 2).For the biological properties of
see: Lozier et al. (1975). For Schiff base see: Şahin et al. (2005); Hadjoudis et al. (1987). For the structure of a similar compound, see: Temel et al. (2007). For classification of hydrogen-bonding patterns, see: Bernstein et al. (1995). For related structural studies of see: (Gül et al., 2007; Şahin et al., 2009a,b,c).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).C14H10F3NO2 | Z = 2 |
Mr = 281.23 | F(000) = 288 |
Triclinic, P1 | Dx = 1.501 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
a = 7.1019 (8) Å | Cell parameters from 6675 reflections |
b = 8.5910 (8) Å | θ = 2.0–27.4° |
c = 11.0412 (11) Å | µ = 0.13 mm−1 |
α = 73.862 (8)° | T = 296 K |
β = 74.133 (7)° | Plate, brown |
γ = 87.431 (8)° | 0.49 × 0.32 × 0.02 mm |
V = 622.10 (11) Å3 |
Stoe IPDS II diffractometer | 2548 independent reflections |
Radiation source: fine-focus sealed tube | 1490 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.073 |
Detector resolution: 6.67 pixels mm-1 | θmax = 26.5°, θmin = 2.0° |
ω scans | h = −8→8 |
Absorption correction: multi-scan (X-RED32; Stoe & Cie, 2002) | k = −10→10 |
Tmin = 0.934, Tmax = 0.995 | l = −13→13 |
6675 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)] = 0.100 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.293 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.07 | w = 1/[σ2(Fo2) + (0.131P)2 + 0.6957P] where P = (Fo2 + 2Fc2)/3 |
2548 reflections | (Δ/σ)max < 0.001 |
183 parameters | Δρmax = 0.62 e Å−3 |
0 restraints | Δρmin = −0.56 e Å−3 |
C14H10F3NO2 | γ = 87.431 (8)° |
Mr = 281.23 | V = 622.10 (11) Å3 |
Triclinic, P1 | Z = 2 |
a = 7.1019 (8) Å | Mo Kα radiation |
b = 8.5910 (8) Å | µ = 0.13 mm−1 |
c = 11.0412 (11) Å | T = 296 K |
α = 73.862 (8)° | 0.49 × 0.32 × 0.02 mm |
β = 74.133 (7)° |
Stoe IPDS II diffractometer | 2548 independent reflections |
Absorption correction: multi-scan (X-RED32; Stoe & Cie, 2002) | 1490 reflections with I > 2σ(I) |
Tmin = 0.934, Tmax = 0.995 | Rint = 0.073 |
6675 measured reflections |
R[F2 > 2σ(F2)] = 0.100 | 0 restraints |
wR(F2) = 0.293 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.07 | Δρmax = 0.62 e Å−3 |
2548 reflections | Δρmin = −0.56 e Å−3 |
183 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 | Occ. (<1) | |
C1 | 0.8807 (6) | 0.4507 (5) | 0.3828 (4) | 0.0464 (11) | |
H6 | 0.9747 | 0.5267 | 0.3765 | 0.056* | |
C2 | 0.9124 (6) | 0.2884 (5) | 0.4264 (4) | 0.0463 (11) | |
C3 | 0.7727 (6) | 0.1751 (5) | 0.4348 (5) | 0.0499 (11) | |
H3 | 0.7950 | 0.0650 | 0.4627 | 0.060* | |
C4 | 0.6009 (6) | 0.2243 (5) | 0.4020 (5) | 0.0527 (12) | |
H4 | 0.5075 | 0.1474 | 0.4089 | 0.063* | |
C5 | 0.5675 (6) | 0.3880 (5) | 0.3588 (4) | 0.0447 (10) | |
C6 | 0.7087 (6) | 0.5034 (5) | 0.3475 (4) | 0.0429 (10) | |
C7 | 0.6778 (7) | 0.6751 (5) | 0.3017 (4) | 0.0476 (11) | |
H7 | 0.7704 | 0.7493 | 0.3002 | 0.057* | |
C8 | 0.5029 (7) | 0.8960 (5) | 0.2113 (5) | 0.0510 (11) | |
C9 | 0.3124 (7) | 0.9517 (6) | 0.2334 (5) | 0.0589 (13) | |
H9 | 0.2073 | 0.8798 | 0.2822 | 0.071* | |
C10 | 0.2797 (8) | 1.1122 (7) | 0.1834 (5) | 0.0677 (15) | |
H10 | 0.1525 | 1.1489 | 0.1997 | 0.081* | |
C11 | 0.4334 (8) | 1.2195 (6) | 0.1095 (5) | 0.0650 (15) | |
H11 | 0.4104 | 1.3281 | 0.0747 | 0.078* | |
C12 | 0.6225 (7) | 1.1646 (5) | 0.0873 (5) | 0.0558 (12) | |
C13 | 0.6580 (7) | 1.0035 (5) | 0.1379 (5) | 0.0539 (12) | |
H13 | 0.7856 | 0.9676 | 0.1228 | 0.065* | |
C14 | 0.7854 (9) | 1.2793 (6) | 0.0089 (6) | 0.0711 (16) | |
N1 | 0.5264 (5) | 0.7276 (4) | 0.2631 (4) | 0.0506 (10) | |
O1 | 0.3968 (4) | 0.4333 (4) | 0.3267 (4) | 0.0603 (10) | |
H1 | 0.405 (9) | 0.543 (8) | 0.297 (6) | 0.09 (2)* | |
O2 | 1.0773 (4) | 0.2313 (4) | 0.4650 (4) | 0.0630 (10) | |
H2 | 1.1482 | 0.3081 | 0.4575 | 0.094* | |
F1A | 0.9366 (14) | 1.2094 (11) | −0.0622 (10) | 0.1040 (13) | 0.488 (5) |
F2A | 0.8727 (14) | 1.3390 (11) | 0.0824 (9) | 0.1040 (13) | 0.488 (5) |
F3A | 0.7488 (14) | 1.4075 (12) | −0.0793 (10) | 0.1040 (13) | 0.488 (5) |
F1B | 0.9660 (13) | 1.2261 (10) | 0.0118 (10) | 0.1040 (13) | 0.512 (5) |
F2B | 0.7781 (13) | 1.4179 (10) | 0.0474 (9) | 0.1040 (13) | 0.512 (5) |
F3B | 0.7846 (14) | 1.3397 (11) | −0.1146 (10) | 0.1040 (13) | 0.512 (5) |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.042 (2) | 0.038 (2) | 0.055 (3) | −0.0027 (17) | −0.0144 (19) | −0.0047 (18) |
C2 | 0.038 (2) | 0.043 (2) | 0.052 (2) | 0.0029 (17) | −0.0122 (18) | −0.0050 (19) |
C3 | 0.047 (2) | 0.034 (2) | 0.062 (3) | 0.0019 (17) | −0.012 (2) | −0.0048 (19) |
C4 | 0.045 (2) | 0.042 (2) | 0.068 (3) | −0.0042 (19) | −0.017 (2) | −0.009 (2) |
C5 | 0.035 (2) | 0.042 (2) | 0.053 (2) | 0.0005 (17) | −0.0104 (18) | −0.0088 (18) |
C6 | 0.039 (2) | 0.037 (2) | 0.051 (2) | 0.0042 (16) | −0.0117 (18) | −0.0098 (17) |
C7 | 0.053 (2) | 0.038 (2) | 0.050 (2) | 0.0008 (18) | −0.015 (2) | −0.0083 (18) |
C8 | 0.055 (3) | 0.044 (2) | 0.054 (3) | 0.013 (2) | −0.021 (2) | −0.009 (2) |
C9 | 0.058 (3) | 0.060 (3) | 0.058 (3) | 0.016 (2) | −0.020 (2) | −0.013 (2) |
C10 | 0.059 (3) | 0.070 (3) | 0.072 (3) | 0.027 (3) | −0.020 (3) | −0.019 (3) |
C11 | 0.080 (4) | 0.050 (3) | 0.065 (3) | 0.029 (3) | −0.026 (3) | −0.015 (2) |
C12 | 0.071 (3) | 0.041 (2) | 0.057 (3) | 0.013 (2) | −0.026 (2) | −0.010 (2) |
C13 | 0.052 (2) | 0.046 (2) | 0.060 (3) | 0.014 (2) | −0.014 (2) | −0.011 (2) |
C14 | 0.084 (4) | 0.045 (3) | 0.076 (4) | 0.015 (3) | −0.025 (3) | −0.001 (3) |
N1 | 0.051 (2) | 0.042 (2) | 0.056 (2) | 0.0084 (16) | −0.0164 (17) | −0.0072 (16) |
O1 | 0.0447 (17) | 0.0469 (19) | 0.086 (2) | 0.0006 (14) | −0.0290 (16) | −0.0024 (17) |
O2 | 0.0441 (17) | 0.0491 (19) | 0.091 (3) | 0.0037 (14) | −0.0281 (17) | −0.0018 (17) |
F1A | 0.109 (3) | 0.078 (3) | 0.103 (3) | −0.015 (2) | −0.019 (2) | 0.002 (2) |
F2A | 0.109 (3) | 0.078 (3) | 0.103 (3) | −0.015 (2) | −0.019 (2) | 0.002 (2) |
F3A | 0.109 (3) | 0.078 (3) | 0.103 (3) | −0.015 (2) | −0.019 (2) | 0.002 (2) |
F1B | 0.109 (3) | 0.078 (3) | 0.103 (3) | −0.015 (2) | −0.019 (2) | 0.002 (2) |
F2B | 0.109 (3) | 0.078 (3) | 0.103 (3) | −0.015 (2) | −0.019 (2) | 0.002 (2) |
F3B | 0.109 (3) | 0.078 (3) | 0.103 (3) | −0.015 (2) | −0.019 (2) | 0.002 (2) |
C1—C2 | 1.374 (6) | C9—C10 | 1.370 (7) |
C1—C6 | 1.400 (6) | C9—H9 | 0.9300 |
C1—H6 | 0.9300 | C10—C11 | 1.376 (8) |
C2—O2 | 1.378 (5) | C10—H10 | 0.9300 |
C2—C3 | 1.388 (6) | C11—C12 | 1.383 (7) |
C3—C4 | 1.382 (6) | C11—H11 | 0.9300 |
C3—H3 | 0.9300 | C12—C13 | 1.381 (6) |
C4—C5 | 1.386 (6) | C12—C14 | 1.463 (8) |
C4—H4 | 0.9300 | C13—H13 | 0.9300 |
C5—O1 | 1.365 (5) | C14—F3B | 1.319 (11) |
C5—C6 | 1.399 (6) | C14—F3A | 1.321 (11) |
C6—C7 | 1.448 (6) | C14—F1B | 1.348 (11) |
C7—N1 | 1.281 (6) | C14—F2A | 1.357 (12) |
C7—H7 | 0.9300 | C14—F2B | 1.365 (11) |
C8—C13 | 1.382 (7) | C14—F1A | 1.369 (11) |
C8—C9 | 1.395 (6) | O1—H1 | 0.91 (7) |
C8—N1 | 1.421 (5) | O2—H2 | 0.8200 |
C2—C1—C6 | 120.9 (4) | C10—C11—C12 | 119.4 (4) |
C2—C1—H6 | 119.6 | C10—C11—H11 | 120.3 |
C6—C1—H6 | 119.6 | C12—C11—H11 | 120.3 |
C1—C2—O2 | 122.8 (4) | C13—C12—C11 | 120.7 (5) |
C1—C2—C3 | 119.5 (4) | C13—C12—C14 | 120.1 (4) |
O2—C2—C3 | 117.7 (4) | C11—C12—C14 | 119.2 (4) |
C4—C3—C2 | 120.6 (4) | C12—C13—C8 | 119.7 (4) |
C4—C3—H3 | 119.7 | C12—C13—H13 | 120.2 |
C2—C3—H3 | 119.7 | C8—C13—H13 | 120.2 |
C3—C4—C5 | 120.1 (4) | F3B—C14—F1B | 108.3 (7) |
C3—C4—H4 | 120.0 | F3A—C14—F1B | 124.5 (7) |
C5—C4—H4 | 120.0 | F3B—C14—F2A | 129.6 (7) |
O1—C5—C4 | 118.9 (4) | F3A—C14—F2A | 105.4 (7) |
O1—C5—C6 | 121.2 (4) | F1B—C14—F2A | 64.3 (6) |
C4—C5—C6 | 119.9 (4) | F3B—C14—F2B | 100.7 (6) |
C5—C6—C1 | 119.0 (4) | F3A—C14—F2B | 67.7 (6) |
C5—C6—C7 | 120.9 (4) | F1B—C14—F2B | 103.3 (7) |
C1—C6—C7 | 120.1 (4) | F3B—C14—F1A | 74.1 (7) |
N1—C7—C6 | 121.8 (4) | F3A—C14—F1A | 103.5 (7) |
N1—C7—H7 | 119.1 | F2A—C14—F1A | 102.9 (7) |
C6—C7—H7 | 119.1 | F2B—C14—F1A | 131.6 (7) |
C13—C8—C9 | 119.5 (4) | F3B—C14—C12 | 113.9 (7) |
C13—C8—N1 | 123.1 (4) | F3A—C14—C12 | 117.6 (6) |
C9—C8—N1 | 117.3 (4) | F1B—C14—C12 | 116.0 (5) |
C10—C9—C8 | 120.1 (5) | F2A—C14—C12 | 113.3 (6) |
C10—C9—H9 | 119.9 | F2B—C14—C12 | 113.1 (6) |
C8—C9—H9 | 119.9 | F1A—C14—C12 | 112.7 (6) |
C9—C10—C11 | 120.6 (5) | C7—N1—C8 | 121.3 (4) |
C9—C10—H10 | 119.7 | C5—O1—H1 | 106 (4) |
C11—C10—H10 | 119.7 | C2—O2—H2 | 109.5 |
C6—C1—C2—O2 | −178.4 (4) | C10—C11—C12—C14 | −179.8 (6) |
C6—C1—C2—C3 | 0.5 (7) | C11—C12—C13—C8 | 0.2 (8) |
C1—C2—C3—C4 | −1.2 (7) | C14—C12—C13—C8 | −179.7 (5) |
O2—C2—C3—C4 | 177.7 (4) | C9—C8—C13—C12 | −0.2 (7) |
C2—C3—C4—C5 | 0.8 (7) | N1—C8—C13—C12 | 177.8 (5) |
C3—C4—C5—O1 | 179.8 (4) | C13—C12—C14—F3B | 114.4 (7) |
C3—C4—C5—C6 | 0.4 (7) | C11—C12—C14—F3B | −65.5 (8) |
O1—C5—C6—C1 | 179.5 (4) | C13—C12—C14—F3A | 152.7 (7) |
C4—C5—C6—C1 | −1.2 (6) | C11—C12—C14—F3A | −27.2 (10) |
O1—C5—C6—C7 | 0.2 (7) | C13—C12—C14—F1B | −12.3 (10) |
C4—C5—C6—C7 | 179.5 (4) | C11—C12—C14—F1B | 167.8 (7) |
C2—C1—C6—C5 | 0.7 (6) | C13—C12—C14—F2A | −83.9 (8) |
C2—C1—C6—C7 | −180.0 (4) | C11—C12—C14—F2A | 96.2 (7) |
C5—C6—C7—N1 | −3.9 (7) | C13—C12—C14—F2B | −131.4 (7) |
C1—C6—C7—N1 | 176.8 (4) | C11—C12—C14—F2B | 48.7 (8) |
C13—C8—C9—C10 | −0.4 (8) | C13—C12—C14—F1A | 32.4 (9) |
N1—C8—C9—C10 | −178.5 (5) | C11—C12—C14—F1A | −147.5 (7) |
C8—C9—C10—C11 | 1.0 (8) | C6—C7—N1—C8 | −176.4 (4) |
C9—C10—C11—C12 | −0.9 (9) | C13—C8—N1—C7 | 34.0 (7) |
C10—C11—C12—C13 | 0.3 (8) | C9—C8—N1—C7 | −147.9 (5) |
D—H···A | D—H | H···A | D···A | D—H···A |
O2—H2···O1i | 0.82 | 2.07 | 2.735 (5) | 138 |
O1—H1···N1 | 0.91 (7) | 1.74 (7) | 2.569 (5) | 151 (6) |
Symmetry code: (i) x+1, y, z. |
Experimental details
Crystal data | |
Chemical formula | C14H10F3NO2 |
Mr | 281.23 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 296 |
a, b, c (Å) | 7.1019 (8), 8.5910 (8), 11.0412 (11) |
α, β, γ (°) | 73.862 (8), 74.133 (7), 87.431 (8) |
V (Å3) | 622.10 (11) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.13 |
Crystal size (mm) | 0.49 × 0.32 × 0.02 |
Data collection | |
Diffractometer | Stoe IPDS II |
Absorption correction | Multi-scan (X-RED32; Stoe & Cie, 2002) |
Tmin, Tmax | 0.934, 0.995 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 6675, 2548, 1490 |
Rint | 0.073 |
(sin θ/λ)max (Å−1) | 0.627 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.100, 0.293, 1.07 |
No. of reflections | 2548 |
No. of parameters | 183 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.62, −0.56 |
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).
D—H···A | D—H | H···A | D···A | D—H···A |
O2—H2···O1i | 0.82 | 2.07 | 2.735 (5) | 138.3 |
O1—H1···N1 | 0.91 (7) | 1.74 (7) | 2.569 (5) | 151 (6) |
Symmetry code: (i) x+1, y, z. |
Acknowledgements
The authors wish to acknowledge the Faculty of Arts and Sciences, Ondokuz Mayıs University, Turkey, for providing access to the Stoe IPDS II diffractometer (purchased under grant No. F279 of the University Research Fund).
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.
The present work is part of a structral study of Schiff bases (Gül et al., 2007; Şahin et al., 2009a,b,c) and we report here the structure of (E)-2-[(3- (trifluoromethyl) phenylimino)methyl]-4-hydroxyphenol,(I). The molecular structure of (I) is shown in Figure 1.
Schiff bases often exhibit various biological activities and in many cases were shown to have antibacterial, anticancer, anti-inflammatory and antitoxic properties (Lozier et al., 1975). There are two types of intramolecular hydrogen bonds in Schiff bases, which may be stabilized either in keto-amine (N—H···O hydrogen bond) (Şahin et al., 2005) or phenol-imine (N···H—O hydrogen bond) tautomeric forms (Hadjoudis et al., 1987). The H1 atom in title compound (I) is located on O1 atom, thus the phenol-imine tautomer is favored over the keto-amine form, as indicated by the C5—O1 [1.365 (5) Å], C7—N1 [1.281 (6) Å], C6—C7 [1.448 (6) Å], C5—C6 [1.399 (6) Å] bond lengths. The O1···N1 distance of 2.569 (5)Å is comparable to those observed for analogous hydrogen bond in (E)-3-[2-(Trifluoromethyl)phenyliminomethyl]- benzene-1,2-diol [2.568 (3) Å; Temel et al., 2007]. The N1—C7 [1.281 (6) Å] bond length is consistent with significant double-bond character of these bonds. It is known that Schiff bases may exhibit thermochromism or photochromism, depending on the planarity or non-planarity of the molecule, respectively. Therefore, one can expect photochromic properties in (I) caused by non-planarity of the molecules; the dihedral angle the aromatic rings 31.94 (14)°. Molecules are linked into sheets by a combination of O—H···O hydrogen bonds (Table 1). Atom O2 in the asymmetric unit acts as hydrogen-bond donor, via H2, connecting this molecule to O1 in a symmetry related molecule at (1 + x,y,z), forming a C(7) chain running parallel to the [100] direction (Fig. 2).