organic compounds
2-[(E)-(Naphthalen-2-ylimino)methyl]-4-(trifluoromethoxy)phenol
aDepartment of Physics, Faculty of Arts and Sciences, Ondokuz Mayıs University, Kurupelit, TR-55139 Samsun, Turkey, bDepartment of Chemistry, Art and Science Faculty, Ondokuz Mayıs University, Kurupelit, TR-55139 Samsun, Turkey, cDepartment of Physics, Faculty of Sciences, Erciyes University, 38039 Kayseri, Turkey, and dHoward University, College of Arts & Sciences, Department of Chemistry, 525 College Street NW, Washington, DC 20059, USA
*Correspondence e-mail: merve.pekdemir@oposta.omu.edu.tr
In the title compound, C18H12F3NO2, the planes of the benzene ring and the naphthalene system form a dihedral angle of 47.21 (3)°. The hydroxy group is involved in an intramolecular O—H⋯N hydrogen bond. In the crystal, weak C—H⋯O and C—H⋯F interactions link the molecules related by translations along the c and a axes, respectively, into sheets.
Related literature
For background to photochromic and thermochromic characteristics and et al. (1964); Hadjoudis et al. (1987). For related structures, see: Gül et al. (2007); Yüce et al. (2004). For classification of hydrogen-bonding patterns, see: Bernstein et al. (1995).
of see: CohenExperimental
Crystal data
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Refinement
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Data collection: CrysAlis PRO (Oxford Diffraction, 2007); cell CrysAlis PRO (Oxford Diffraction, 2007); data reduction: CrysAlis PRO (Oxford Diffraction, 2007); 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
10.1107/S1600536812009361/cv5250sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536812009361/cv5250Isup2.hkl
Supporting information file. DOI: 10.1107/S1600536812009361/cv5250Isup3.cml
The title compound, (I), was prepared by reflux a mixture of a solution containing 2-hydroxy-5-(trifluoromethoxy)benzaldehyde (0.045 g 0.23 mmol) in 20 ml e thanol and a solution containing 2-Naphthyamine (0.033 g 0.23 mmol) in 20 ml e thanol. The reaction mixture was stirred for 1 hunder reflux. The crystals of (I) suitable for X-ray analysis were obtained from ethylalcohol by slow evaporation (yield % 68; m.p.369–371 K).
The H1 atom was located in a difference map, and isotropically refined with restraint of O—H=0.82 (2) Å. All other H atoms were placed in calculated positions and constrained to ride on their parents atoms, with C—H=0.93 Å and Uiso(H)=1.2Ueq(C).
There are two characteristic properties of
viz. and thermochromism (Cohen et al., 1964). These properties result from proton transfer from the hydroxyl O atom to the imine N atom (Hadjoudis et al., 1987). There are two types of intramolecular hydrogen bonds in which may be stabilized in keto-amine (N—H···O hydrogen bond) or phenol-imine (N···H—O hydrogen bond) tautomeric forms (Hadjoudis et al., 1987). Herewith we present the title compound (I), which exhibits the phenol-imine tautomeric form (Fig. 1).In (I), the C1—N1 bond length of 1.417 (2) Å agrees with the matching distance in 1-{4-[2-hydroxy-benzylidene)amino]phenyl}ethanone [1.4138 (17) Å; Yüce et al., 2004]. The N1═C11 bond length of 1.284 (2) Å is typical of a double bond, like to the matching bond length in (E)-2-[(3-trifluoromenthylphenylimino)methyl]-4-methylphenol [1.280 (2) Å; Gül et al., 2007]. The O1—C17 distance of 1.349 (2) Å is similar to the worth of 1.352 (3) Å in (E)-2-[(3-trifluoromenthylphenylimino)methyl]-4-methylphenol (Gül et al., 2007). Fig.1 additionally shows a strong intramolecular hyrogen bond (O1—H1···N1) can be defined as an S(6) motif (Bernstein et al., 1995). The O1—N1 distance of 2.590 (2) Å is comparable to those observed for same hydrogen bonds in 1-{4-[(2-hydroxy-benzylidene)amino]phenyl}ethanone [2.594 (2) Å; Yüce et al., 2004].
The molecules are linked into sheets by a combination of C—H···O and C—H···F interactions (Table 1). The atom C10 in the reference molecule at (x, y, z) acts as a hydrogen-bond donor, via H10, to atom O1 in the molecule at (x, y, z + 1), so forming a C(8) chain running parallel to the [001] direction. Similarly, atom C5 in the molecule at (x, y, z) acts as a hydrogen-bond donor, via H5, to atom F2 in the molecule at (x + 1, y, z), so forming a C(14) chain running parallel to the [100] direction. The combination of the C(8) and C(14) chains generates a chain edge-fused R55(36) rings running parallel to the ac plane (Fig.2)
For background to photochromic and thermochromic characteristics and
of see: Cohen et al. (1964); Hadjoudis et al. (1987). For related structures, see: Gül et al. (2007); Yüce et al. (2004). For classification of hydrogen-bonding patterns, see: Bernstein et al. (1995).Data collection: CrysAlis PRO (Oxford Diffraction, 2007); cell
CrysAlis PRO (Oxford Diffraction, 2007); data reduction: CrysAlis PRO (Oxford Diffraction, 2007); 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).C18H12F3NO2 | F(000) = 680 |
Mr = 331.29 | Dx = 1.495 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 5076 reflections |
a = 17.0813 (10) Å | θ = 3.1–34.9° |
b = 14.1248 (8) Å | µ = 0.12 mm−1 |
c = 6.1900 (5) Å | T = 123 K |
β = 99.669 (6)° | Plate, yellow |
V = 1472.25 (17) Å3 | 0.50 × 0.40 × 0.18 mm |
Z = 4 |
Oxford Diffraction Gemini-R diffractometer | 2892 independent reflections |
Radiation source: Enhance (Mo) X-ray Source | 2497 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.050 |
Detector resolution: 10.5081 pixels mm-1 | θmax = 26.0°, θmin = 3.1° |
ω scans | h = −20→21 |
Absorption correction: analytical [CrysAlis RED (Oxford Diffraction, 2007) based on Clark & Reid (1995) | k = −17→17 |
Tmin = 0.941, Tmax = 0.978 | l = −7→6 |
15270 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)] = 0.049 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.130 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.09 | w = 1/[σ2(Fo2) + (0.062P)2 + 0.5277P] where P = (Fo2 + 2Fc2)/3 |
2892 reflections | (Δ/σ)max < 0.001 |
221 parameters | Δρmax = 0.31 e Å−3 |
0 restraints | Δρmin = −0.22 e Å−3 |
C18H12F3NO2 | V = 1472.25 (17) Å3 |
Mr = 331.29 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 17.0813 (10) Å | µ = 0.12 mm−1 |
b = 14.1248 (8) Å | T = 123 K |
c = 6.1900 (5) Å | 0.50 × 0.40 × 0.18 mm |
β = 99.669 (6)° |
Oxford Diffraction Gemini-R diffractometer | 2892 independent reflections |
Absorption correction: analytical [CrysAlis RED (Oxford Diffraction, 2007) based on Clark & Reid (1995) | 2497 reflections with I > 2σ(I) |
Tmin = 0.941, Tmax = 0.978 | Rint = 0.050 |
15270 measured reflections |
R[F2 > 2σ(F2)] = 0.049 | 0 restraints |
wR(F2) = 0.130 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.09 | Δρmax = 0.31 e Å−3 |
2892 reflections | Δρmin = −0.22 e Å−3 |
221 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 | ||
C1 | 0.52707 (9) | 0.88417 (11) | 0.3403 (3) | 0.0225 (4) | |
C2 | 0.59465 (10) | 0.90836 (11) | 0.2604 (3) | 0.0225 (3) | |
H2 | 0.5903 | 0.9338 | 0.1203 | 0.027* | |
C3 | 0.67071 (9) | 0.89512 (10) | 0.3876 (3) | 0.0222 (3) | |
C4 | 0.74184 (10) | 0.91509 (11) | 0.3061 (3) | 0.0268 (4) | |
H4 | 0.7390 | 0.9413 | 0.1672 | 0.032* | |
C5 | 0.81420 (10) | 0.89635 (12) | 0.4287 (3) | 0.0313 (4) | |
H5 | 0.8601 | 0.9103 | 0.3729 | 0.038* | |
C6 | 0.82014 (11) | 0.85608 (12) | 0.6391 (3) | 0.0320 (4) | |
H6 | 0.8698 | 0.8424 | 0.7201 | 0.038* | |
C7 | 0.75296 (10) | 0.83705 (11) | 0.7244 (3) | 0.0275 (4) | |
H7 | 0.7573 | 0.8114 | 0.8642 | 0.033* | |
C8 | 0.67680 (10) | 0.85604 (11) | 0.6021 (3) | 0.0232 (4) | |
C9 | 0.60574 (10) | 0.83457 (11) | 0.6822 (3) | 0.0246 (4) | |
H9 | 0.6089 | 0.8110 | 0.8237 | 0.029* | |
C10 | 0.53290 (10) | 0.84767 (11) | 0.5564 (3) | 0.0244 (4) | |
H10 | 0.4871 | 0.8327 | 0.6121 | 0.029* | |
C11 | 0.38798 (10) | 0.90319 (11) | 0.2662 (3) | 0.0241 (4) | |
H11 | 0.3894 | 0.9215 | 0.4112 | 0.029* | |
C12 | 0.31186 (10) | 0.89349 (11) | 0.1221 (3) | 0.0236 (4) | |
C13 | 0.24206 (10) | 0.92206 (11) | 0.1940 (3) | 0.0246 (4) | |
H13 | 0.2443 | 0.9475 | 0.3334 | 0.030* | |
C14 | 0.17025 (10) | 0.91238 (11) | 0.0580 (3) | 0.0265 (4) | |
C15 | 0.16428 (10) | 0.87238 (12) | −0.1487 (3) | 0.0285 (4) | |
H15 | 0.1150 | 0.8661 | −0.2381 | 0.034* | |
C16 | 0.23260 (10) | 0.84183 (12) | −0.2206 (3) | 0.0279 (4) | |
H16 | 0.2290 | 0.8130 | −0.3570 | 0.034* | |
C17 | 0.30663 (10) | 0.85398 (11) | −0.0901 (3) | 0.0248 (4) | |
C18 | 0.05121 (10) | 0.89134 (14) | 0.1960 (3) | 0.0335 (4) | |
F1 | 0.08590 (7) | 0.83013 (9) | 0.3436 (2) | 0.0551 (4) | |
F2 | −0.00045 (7) | 0.94076 (10) | 0.2849 (2) | 0.0537 (4) | |
F3 | 0.01029 (7) | 0.84060 (11) | 0.0357 (2) | 0.0614 (4) | |
N1 | 0.45326 (8) | 0.88684 (9) | 0.1961 (2) | 0.0241 (3) | |
O1 | 0.37203 (7) | 0.82747 (9) | −0.1701 (2) | 0.0301 (3) | |
O2 | 0.10202 (7) | 0.95092 (8) | 0.1277 (2) | 0.0328 (3) | |
H1 | 0.4140 (16) | 0.8422 (18) | −0.067 (5) | 0.066 (8)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.0276 (8) | 0.0185 (8) | 0.0218 (8) | 0.0017 (6) | 0.0051 (7) | −0.0016 (6) |
C2 | 0.0325 (9) | 0.0176 (7) | 0.0184 (8) | 0.0003 (6) | 0.0072 (7) | 0.0002 (6) |
C3 | 0.0282 (8) | 0.0162 (7) | 0.0228 (8) | 0.0003 (6) | 0.0060 (7) | −0.0030 (6) |
C4 | 0.0327 (9) | 0.0225 (8) | 0.0268 (9) | −0.0017 (7) | 0.0095 (7) | −0.0011 (7) |
C5 | 0.0279 (9) | 0.0273 (9) | 0.0402 (10) | −0.0031 (7) | 0.0102 (8) | −0.0038 (8) |
C6 | 0.0299 (9) | 0.0266 (9) | 0.0370 (10) | 0.0026 (7) | −0.0018 (8) | −0.0041 (8) |
C7 | 0.0349 (9) | 0.0205 (8) | 0.0256 (9) | 0.0014 (6) | 0.0013 (7) | −0.0025 (6) |
C8 | 0.0317 (9) | 0.0158 (7) | 0.0220 (8) | 0.0005 (6) | 0.0043 (7) | −0.0026 (6) |
C9 | 0.0345 (9) | 0.0215 (8) | 0.0185 (8) | 0.0009 (6) | 0.0070 (7) | 0.0011 (6) |
C10 | 0.0282 (8) | 0.0223 (8) | 0.0253 (9) | −0.0004 (6) | 0.0118 (7) | −0.0016 (6) |
C11 | 0.0304 (9) | 0.0207 (8) | 0.0222 (8) | 0.0005 (6) | 0.0069 (7) | −0.0012 (6) |
C12 | 0.0292 (8) | 0.0191 (8) | 0.0231 (8) | −0.0001 (6) | 0.0063 (7) | 0.0026 (6) |
C13 | 0.0323 (9) | 0.0191 (8) | 0.0235 (8) | 0.0006 (6) | 0.0076 (7) | −0.0003 (6) |
C14 | 0.0277 (8) | 0.0224 (8) | 0.0303 (9) | 0.0020 (6) | 0.0080 (7) | 0.0031 (7) |
C15 | 0.0291 (9) | 0.0270 (8) | 0.0282 (9) | −0.0026 (7) | 0.0014 (7) | 0.0036 (7) |
C16 | 0.0350 (9) | 0.0264 (8) | 0.0221 (8) | −0.0016 (7) | 0.0041 (7) | 0.0003 (7) |
C17 | 0.0303 (9) | 0.0213 (8) | 0.0245 (9) | −0.0010 (6) | 0.0092 (7) | 0.0010 (6) |
C18 | 0.0257 (9) | 0.0413 (11) | 0.0330 (10) | 0.0012 (7) | 0.0035 (8) | −0.0022 (8) |
F1 | 0.0503 (7) | 0.0630 (8) | 0.0554 (8) | 0.0110 (6) | 0.0188 (6) | 0.0264 (6) |
F2 | 0.0386 (7) | 0.0587 (8) | 0.0701 (9) | 0.0065 (5) | 0.0274 (6) | −0.0067 (6) |
F3 | 0.0440 (7) | 0.0829 (10) | 0.0581 (8) | −0.0267 (7) | 0.0108 (6) | −0.0259 (7) |
N1 | 0.0275 (7) | 0.0215 (7) | 0.0236 (7) | −0.0009 (5) | 0.0052 (6) | 0.0006 (5) |
O1 | 0.0299 (7) | 0.0375 (7) | 0.0244 (6) | 0.0001 (5) | 0.0085 (5) | −0.0058 (5) |
O2 | 0.0283 (6) | 0.0289 (7) | 0.0428 (8) | 0.0036 (5) | 0.0103 (5) | −0.0008 (5) |
C1—C2 | 1.373 (2) | C11—N1 | 1.284 (2) |
C1—N1 | 1.417 (2) | C11—C12 | 1.454 (2) |
C1—C10 | 1.421 (2) | C11—H11 | 0.9300 |
C2—C3 | 1.414 (2) | C12—C13 | 1.400 (2) |
C2—H2 | 0.9300 | C12—C17 | 1.416 (2) |
C3—C4 | 1.420 (2) | C13—C14 | 1.373 (2) |
C3—C8 | 1.425 (2) | C13—H13 | 0.9300 |
C4—C5 | 1.363 (2) | C14—C15 | 1.387 (2) |
C4—H4 | 0.9300 | C14—O2 | 1.4176 (19) |
C5—C6 | 1.409 (3) | C15—C16 | 1.386 (2) |
C5—H5 | 0.9300 | C15—H15 | 0.9300 |
C6—C7 | 1.368 (3) | C16—C17 | 1.392 (2) |
C6—H6 | 0.9300 | C16—H16 | 0.9300 |
C7—C8 | 1.416 (2) | C17—O1 | 1.349 (2) |
C7—H7 | 0.9300 | C18—F2 | 1.316 (2) |
C8—C9 | 1.419 (2) | C18—F1 | 1.324 (2) |
C9—C10 | 1.365 (2) | C18—F3 | 1.324 (2) |
C9—H9 | 0.9300 | C18—O2 | 1.328 (2) |
C10—H10 | 0.9300 | O1—H1 | 0.90 (3) |
C2—C1—N1 | 118.63 (14) | N1—C11—C12 | 120.90 (15) |
C2—C1—C10 | 119.94 (15) | N1—C11—H11 | 119.5 |
N1—C1—C10 | 121.10 (14) | C12—C11—H11 | 119.5 |
C1—C2—C3 | 121.05 (15) | C13—C12—C17 | 118.92 (15) |
C1—C2—H2 | 119.5 | C13—C12—C11 | 119.96 (15) |
C3—C2—H2 | 119.5 | C17—C12—C11 | 121.11 (15) |
C2—C3—C4 | 122.47 (15) | C14—C13—C12 | 119.83 (15) |
C2—C3—C8 | 119.10 (14) | C14—C13—H13 | 120.1 |
C4—C3—C8 | 118.35 (15) | C12—C13—H13 | 120.1 |
C5—C4—C3 | 120.90 (16) | C13—C14—C15 | 121.73 (15) |
C5—C4—H4 | 119.6 | C13—C14—O2 | 118.08 (15) |
C3—C4—H4 | 119.6 | C15—C14—O2 | 120.04 (15) |
C4—C5—C6 | 120.71 (16) | C16—C15—C14 | 119.18 (16) |
C4—C5—H5 | 119.6 | C16—C15—H15 | 120.4 |
C6—C5—H5 | 119.6 | C14—C15—H15 | 120.4 |
C7—C6—C5 | 120.07 (16) | C15—C16—C17 | 120.49 (16) |
C7—C6—H6 | 120.0 | C15—C16—H16 | 119.8 |
C5—C6—H6 | 120.0 | C17—C16—H16 | 119.8 |
C6—C7—C8 | 120.76 (16) | O1—C17—C16 | 118.72 (15) |
C6—C7—H7 | 119.6 | O1—C17—C12 | 121.51 (15) |
C8—C7—H7 | 119.6 | C16—C17—C12 | 119.77 (15) |
C7—C8—C9 | 122.39 (15) | F2—C18—F1 | 108.15 (15) |
C7—C8—C3 | 119.20 (15) | F2—C18—F3 | 107.09 (14) |
C9—C8—C3 | 118.38 (15) | F1—C18—F3 | 106.41 (17) |
C10—C9—C8 | 121.55 (15) | F2—C18—O2 | 108.49 (16) |
C10—C9—H9 | 119.2 | F1—C18—O2 | 113.14 (14) |
C8—C9—H9 | 119.2 | F3—C18—O2 | 113.28 (15) |
C9—C10—C1 | 119.93 (15) | C11—N1—C1 | 121.55 (14) |
C9—C10—H10 | 120.0 | C17—O1—H1 | 106.7 (17) |
C1—C10—H10 | 120.0 | C18—O2—C14 | 117.93 (13) |
N1—C1—C2—C3 | −171.57 (13) | C17—C12—C13—C14 | −0.7 (2) |
C10—C1—C2—C3 | 1.8 (2) | C11—C12—C13—C14 | −179.68 (14) |
C1—C2—C3—C4 | 176.90 (14) | C12—C13—C14—C15 | 1.8 (2) |
C1—C2—C3—C8 | 0.0 (2) | C12—C13—C14—O2 | −173.65 (14) |
C2—C3—C4—C5 | −176.17 (15) | C13—C14—C15—C16 | −0.4 (2) |
C8—C3—C4—C5 | 0.8 (2) | O2—C14—C15—C16 | 174.97 (14) |
C3—C4—C5—C6 | 0.4 (3) | C14—C15—C16—C17 | −2.1 (2) |
C4—C5—C6—C7 | −1.3 (3) | C15—C16—C17—O1 | −176.85 (14) |
C5—C6—C7—C8 | 1.0 (3) | C15—C16—C17—C12 | 3.2 (2) |
C6—C7—C8—C9 | 178.00 (15) | C13—C12—C17—O1 | 178.27 (14) |
C6—C7—C8—C3 | 0.2 (2) | C11—C12—C17—O1 | −2.7 (2) |
C2—C3—C8—C7 | 175.98 (14) | C13—C12—C17—C16 | −1.8 (2) |
C4—C3—C8—C7 | −1.1 (2) | C11—C12—C17—C16 | 177.22 (14) |
C2—C3—C8—C9 | −1.9 (2) | C12—C11—N1—C1 | −171.85 (13) |
C4—C3—C8—C9 | −178.95 (14) | C2—C1—N1—C11 | −151.42 (15) |
C7—C8—C9—C10 | −175.68 (15) | C10—C1—N1—C11 | 35.3 (2) |
C3—C8—C9—C10 | 2.1 (2) | F2—C18—O2—C14 | 170.19 (14) |
C8—C9—C10—C1 | −0.4 (2) | F1—C18—O2—C14 | 50.2 (2) |
C2—C1—C10—C9 | −1.6 (2) | F3—C18—O2—C14 | −71.0 (2) |
N1—C1—C10—C9 | 171.60 (14) | C13—C14—O2—C18 | −105.77 (18) |
N1—C11—C12—C13 | −172.63 (14) | C15—C14—O2—C18 | 78.7 (2) |
N1—C11—C12—C17 | 8.4 (2) |
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1···N1 | 0.90 (3) | 1.77 (3) | 2.5904 (18) | 150 (2) |
C10—H10···O1i | 0.93 | 2.57 | 3.473 (2) | 165 |
C5—H5···F2ii | 0.93 | 2.57 | 3.487 (2) | 170 |
Symmetry codes: (i) x, y, z+1; (ii) x+1, y, z. |
Experimental details
Crystal data | |
Chemical formula | C18H12F3NO2 |
Mr | 331.29 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 123 |
a, b, c (Å) | 17.0813 (10), 14.1248 (8), 6.1900 (5) |
β (°) | 99.669 (6) |
V (Å3) | 1472.25 (17) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.12 |
Crystal size (mm) | 0.50 × 0.40 × 0.18 |
Data collection | |
Diffractometer | Oxford Diffraction Gemini-R |
Absorption correction | Analytical [CrysAlis RED (Oxford Diffraction, 2007) based on Clark & Reid (1995) |
Tmin, Tmax | 0.941, 0.978 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 15270, 2892, 2497 |
Rint | 0.050 |
(sin θ/λ)max (Å−1) | 0.617 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.049, 0.130, 1.09 |
No. of reflections | 2892 |
No. of parameters | 221 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.31, −0.22 |
Computer programs: CrysAlis PRO (Oxford Diffraction, 2007), 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 |
O1—H1···N1 | 0.90 (3) | 1.77 (3) | 2.5904 (18) | 150 (2) |
C10—H10···O1i | 0.93 | 2.57 | 3.473 (2) | 165.4 |
C5—H5···F2ii | 0.93 | 2.57 | 3.487 (2) | 170.1 |
Symmetry codes: (i) x, y, z+1; (ii) x+1, y, z. |
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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.
There are two characteristic properties of Schiff bases, viz. photochromism and thermochromism (Cohen et al., 1964). These properties result from proton transfer from the hydroxyl O atom to the imine N atom (Hadjoudis et al., 1987). There are two types of intramolecular hydrogen bonds in Schiff bases, which may be stabilized in keto-amine (N—H···O hydrogen bond) or phenol-imine (N···H—O hydrogen bond) tautomeric forms (Hadjoudis et al., 1987). Herewith we present the title compound (I), which exhibits the phenol-imine tautomeric form (Fig. 1).
In (I), the C1—N1 bond length of 1.417 (2) Å agrees with the matching distance in 1-{4-[2-hydroxy-benzylidene)amino]phenyl}ethanone [1.4138 (17) Å; Yüce et al., 2004]. The N1═C11 bond length of 1.284 (2) Å is typical of a double bond, like to the matching bond length in (E)-2-[(3-trifluoromenthylphenylimino)methyl]-4-methylphenol [1.280 (2) Å; Gül et al., 2007]. The O1—C17 distance of 1.349 (2) Å is similar to the worth of 1.352 (3) Å in (E)-2-[(3-trifluoromenthylphenylimino)methyl]-4-methylphenol (Gül et al., 2007). Fig.1 additionally shows a strong intramolecular hyrogen bond (O1—H1···N1) can be defined as an S(6) motif (Bernstein et al., 1995). The O1—N1 distance of 2.590 (2) Å is comparable to those observed for same hydrogen bonds in 1-{4-[(2-hydroxy-benzylidene)amino]phenyl}ethanone [2.594 (2) Å; Yüce et al., 2004].
The molecules are linked into sheets by a combination of C—H···O and C—H···F interactions (Table 1). The atom C10 in the reference molecule at (x, y, z) acts as a hydrogen-bond donor, via H10, to atom O1 in the molecule at (x, y, z + 1), so forming a C(8) chain running parallel to the [001] direction. Similarly, atom C5 in the molecule at (x, y, z) acts as a hydrogen-bond donor, via H5, to atom F2 in the molecule at (x + 1, y, z), so forming a C(14) chain running parallel to the [100] direction. The combination of the C(8) and C(14) chains generates a chain edge-fused R55(36) rings running parallel to the ac plane (Fig.2)