organic compounds
2-[(2-Bromophenyl)iminomethyl]-6-methylphenol
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, Yüzüncü Yıl Univercity, 65250 Van, Turkey
*Correspondence e-mail: asli.karadag@omu.edu.tr
In the title compound, C14H12BrNO, is a Schiff base which adopts the phenol–imine tautomeric form in the solid state. The dihedral angle between the two aromatic rings is 34.26 (9)° and an intramolecular O—H⋯N hydrogen bond generates an S(6) ring.
Related literature
For et al. (1972); Singh et al. (1975). For a related structure, see: Temel et al. (2007).
and their applications, see: CalligarisExperimental
Crystal data
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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/S1600536810043072/bt5384sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810043072/bt5384Isup2.hkl
The compound 2-[(2-Bromophenylimino) methyl]-6- methylphenol was prepared by reflux a mixture of a solution containing 3-Methylsalicylaldehyde (0.05 g 0.36 mmol) in 20 ml e thanol and a solution containing 2-Bromoaniline(0.062 g 0.36 mmol) in 20 ml e thanol. The reaction mixture was stirred for 1 hunder reflux. The crystals of 2-[(2-Bromophenylimino) methyl]-6- methylphenol suitable for X-ray analysis were obtained from ethylalcohol by slow evaporation (yield % 63; m.p.418–420 K).
H atoms were positioned geometrically with distances 0.93 Å for aromatic C—H, 0.97 Å for methylene C—H, 0.86 Å for O—H hydroxyl group and refined a riding model with Uiso(H) = 1.2Ueq(C,O).
Schiff bases have been used extensively as ligands in the field of coordination chemistry (Calligaris et al., 1972).
derived from aromatic and aromatic have a wide variety of applications in many fields, e.g., biological, inorganic and analytical chemistry (Singh et al., 1975).Schiff base compounds show
and thermochromism in the solid state by proton transfer from the hydroxyl O atom to the imine N atom.The overall behaviour of these compounds has been ascribed to a proton-transfer reaction between a phenol-imine and a keto-amine tautomer. In solution, the existence of this
which depends on the formation of intramolecular hydrogen bonds, is possible.X-ray investigation of the title compound, (I), has indicated that the phenol-imine tautomer is favoured over the keto-amine tautomer. Bond lengths (Fig. 1) C2—O1 [1.364 (3) Å], C7—N1 [1.285 (3) Å], C1—C7 [1.451 (4) Å] and C1—C2 [1.403 (4) Å]. The C2—O1 bond length of 1.364 (3) Å indicates a single-bond character, whereas the C7—N1 bond length of 1.285 (3) Å indicates a high degree of double-bond character. Similar results were observed for (E)-3-[(2- fluorophenylimino)methyl]benzene-1,2-diol [C—O = 1.354 (19) Å, C—N = 1.285 (2) Å; Temel et al., 2007].
N···H—O hydrogen bond generate an S(6) ring motif (Fig. 1).
For
and their applications, see: Calligaris et al. (1972); Singh et al. (1975). For a related structure, see: Temel et al. (2007).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).Fig. 1. The molecular structure of the title compound, showing the atom-numbering scheme. Displacement ellipsoids are drawn at the 50% probability. |
C14H12BrNO | F(000) = 584 |
Mr = 290.16 | Dx = 1.575 Mg m−3 |
Orthorhombic, P212121 | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: P 2ac 2ab | Cell parameters from 23647 reflections |
a = 7.9407 (4) Å | θ = 2.3–28.0° |
b = 11.6754 (8) Å | µ = 3.34 mm−1 |
c = 13.1960 (6) Å | T = 296 K |
V = 1223.41 (12) Å3 | Prism, yellow |
Z = 4 | 0.47 × 0.39 × 0.24 mm |
Stoe IPDS 2 diffractometer | 2929 independent reflections |
Radiation source: fine-focus sealed tube | 2427 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.067 |
Detector resolution: 6.67 pixels mm-1 | θmax = 28.0°, θmin = 2.3° |
rotation method scans | h = −10→10 |
Absorption correction: integration (X-RED32; Stoe & Cie, 2002) | k = −15→15 |
Tmin = 0.358, Tmax = 0.525 | l = −17→17 |
21115 measured reflections |
Refinement on F2 | Hydrogen site location: inferred from neighbouring sites |
Least-squares matrix: full | H atoms treated by a mixture of independent and constrained refinement |
R[F2 > 2σ(F2)] = 0.035 | w = 1/[σ2(Fo2) + (0.0416P)2 + 0.0403P] where P = (Fo2 + 2Fc2)/3 |
wR(F2) = 0.080 | (Δ/σ)max = 0.001 |
S = 1.07 | Δρmax = 0.64 e Å−3 |
2929 reflections | Δρmin = −0.27 e Å−3 |
160 parameters | Extinction correction: SHELXL97 (Sheldrick, 2008), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
0 restraints | Extinction coefficient: 0.0200 (16) |
Primary atom site location: structure-invariant direct methods | Absolute structure: Flack (1983), 1229 Friedel pairs |
Secondary atom site location: difference Fourier map | Absolute structure parameter: −0.003 (10) |
C14H12BrNO | V = 1223.41 (12) Å3 |
Mr = 290.16 | Z = 4 |
Orthorhombic, P212121 | Mo Kα radiation |
a = 7.9407 (4) Å | µ = 3.34 mm−1 |
b = 11.6754 (8) Å | T = 296 K |
c = 13.1960 (6) Å | 0.47 × 0.39 × 0.24 mm |
Stoe IPDS 2 diffractometer | 2929 independent reflections |
Absorption correction: integration (X-RED32; Stoe & Cie, 2002) | 2427 reflections with I > 2σ(I) |
Tmin = 0.358, Tmax = 0.525 | Rint = 0.067 |
21115 measured reflections |
R[F2 > 2σ(F2)] = 0.035 | H atoms treated by a mixture of independent and constrained refinement |
wR(F2) = 0.080 | Δρmax = 0.64 e Å−3 |
S = 1.07 | Δρmin = −0.27 e Å−3 |
2929 reflections | Absolute structure: Flack (1983), 1229 Friedel pairs |
160 parameters | Absolute structure parameter: −0.003 (10) |
0 restraints |
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 | ||
H1 | 0.744 (4) | 0.652 (3) | 0.652 (3) | 0.062 (9)* | |
Br1 | 0.79638 (5) | 0.84452 (3) | 0.81971 (3) | 0.07572 (15) | |
C4 | 0.7065 (4) | 0.5259 (2) | 0.3545 (2) | 0.0582 (7) | |
H4 | 0.6400 | 0.4945 | 0.3036 | 0.070* | |
N1 | 0.9650 (3) | 0.68078 (17) | 0.67303 (16) | 0.0487 (5) | |
C7 | 1.0181 (3) | 0.6620 (2) | 0.58252 (19) | 0.0477 (5) | |
H7 | 1.1302 | 0.6768 | 0.5669 | 0.057* | |
C5 | 0.8731 (4) | 0.5467 (3) | 0.3351 (2) | 0.0609 (7) | |
H5 | 0.9181 | 0.5292 | 0.2719 | 0.073* | |
C1 | 0.9072 (3) | 0.6182 (2) | 0.50413 (18) | 0.0452 (5) | |
O1 | 0.6641 (2) | 0.62056 (19) | 0.61369 (15) | 0.0596 (5) | |
C2 | 0.7361 (3) | 0.5966 (2) | 0.52228 (18) | 0.0457 (6) | |
C10 | 1.3450 (4) | 0.7113 (3) | 0.8347 (3) | 0.0666 (8) | |
H10 | 1.4553 | 0.6848 | 0.8380 | 0.080* | |
C13 | 1.0198 (4) | 0.7883 (2) | 0.8254 (2) | 0.0527 (6) | |
C9 | 1.2424 (4) | 0.6774 (2) | 0.7555 (2) | 0.0569 (7) | |
H9 | 1.2843 | 0.6284 | 0.7060 | 0.068* | |
C6 | 0.9732 (4) | 0.5931 (3) | 0.40857 (19) | 0.0568 (7) | |
H6 | 1.0860 | 0.6080 | 0.3949 | 0.068* | |
C3 | 0.6334 (4) | 0.5500 (2) | 0.4475 (2) | 0.0503 (6) | |
C8 | 1.0769 (3) | 0.7162 (2) | 0.7491 (2) | 0.0482 (6) | |
C11 | 1.2857 (5) | 0.7834 (3) | 0.9084 (3) | 0.0683 (8) | |
H11 | 1.3557 | 0.8059 | 0.9613 | 0.082* | |
C14 | 0.4513 (4) | 0.5289 (3) | 0.4673 (3) | 0.0710 (8) | |
H14A | 0.4396 | 0.4770 | 0.5233 | 0.106* | |
H14B | 0.4003 | 0.4960 | 0.4081 | 0.106* | |
H14C | 0.3967 | 0.6000 | 0.4832 | 0.106* | |
C12 | 1.1230 (5) | 0.8226 (3) | 0.9041 (2) | 0.0626 (8) | |
H12 | 1.0823 | 0.8718 | 0.9538 | 0.075* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Br1 | 0.0655 (2) | 0.0941 (2) | 0.06760 (19) | 0.01958 (17) | 0.00516 (17) | −0.00921 (17) |
C4 | 0.0647 (17) | 0.0583 (15) | 0.0515 (13) | 0.0010 (15) | −0.0149 (14) | −0.0035 (11) |
N1 | 0.0488 (11) | 0.0516 (11) | 0.0456 (10) | −0.0009 (8) | −0.0020 (10) | −0.0013 (10) |
C7 | 0.0435 (12) | 0.0506 (12) | 0.0490 (13) | −0.0016 (12) | 0.0018 (11) | 0.0009 (12) |
C5 | 0.0707 (18) | 0.0695 (17) | 0.0425 (14) | 0.0056 (15) | 0.0005 (13) | −0.0047 (13) |
C1 | 0.0471 (13) | 0.0462 (13) | 0.0422 (11) | 0.0007 (10) | 0.0007 (11) | 0.0048 (9) |
O1 | 0.0456 (10) | 0.0832 (14) | 0.0500 (10) | −0.0008 (9) | 0.0042 (9) | −0.0049 (9) |
C2 | 0.0469 (14) | 0.0450 (12) | 0.0450 (12) | 0.0035 (10) | 0.0006 (10) | 0.0046 (10) |
C10 | 0.0527 (16) | 0.0665 (17) | 0.081 (2) | −0.0055 (13) | −0.0152 (15) | −0.0016 (16) |
C13 | 0.0576 (15) | 0.0524 (13) | 0.0482 (13) | −0.0044 (12) | 0.0004 (14) | 0.0009 (13) |
C9 | 0.0486 (15) | 0.0564 (16) | 0.0657 (16) | −0.0019 (11) | −0.0052 (12) | −0.0064 (12) |
C6 | 0.0542 (15) | 0.0695 (17) | 0.0467 (14) | 0.0024 (13) | 0.0078 (13) | 0.0004 (13) |
C3 | 0.0466 (13) | 0.0507 (13) | 0.0536 (14) | 0.0009 (11) | −0.0083 (12) | 0.0049 (11) |
C8 | 0.0492 (14) | 0.0464 (13) | 0.0489 (13) | −0.0062 (11) | −0.0030 (12) | 0.0016 (11) |
C11 | 0.073 (2) | 0.0618 (17) | 0.0697 (18) | −0.0122 (16) | −0.0224 (18) | 0.0005 (14) |
C14 | 0.0507 (17) | 0.083 (2) | 0.079 (2) | −0.0072 (15) | −0.0082 (16) | −0.0021 (18) |
C12 | 0.077 (2) | 0.0556 (17) | 0.0554 (15) | −0.0096 (15) | −0.0013 (15) | −0.0058 (13) |
Br1—C13 | 1.893 (3) | C10—C11 | 1.370 (5) |
C4—C5 | 1.370 (5) | C10—C9 | 1.383 (4) |
C4—C3 | 1.386 (4) | C10—H10 | 0.9300 |
C4—H4 | 0.9300 | C13—C12 | 1.382 (4) |
N1—C7 | 1.285 (3) | C13—C8 | 1.388 (4) |
N1—C8 | 1.402 (3) | C9—C8 | 1.392 (4) |
C7—C1 | 1.451 (4) | C9—H9 | 0.9300 |
C7—H7 | 0.9300 | C6—H6 | 0.9300 |
C5—C6 | 1.366 (4) | C3—C14 | 1.490 (4) |
C5—H5 | 0.9300 | C11—C12 | 1.372 (5) |
C1—C6 | 1.397 (4) | C11—H11 | 0.9300 |
C1—C2 | 1.403 (4) | C14—H14A | 0.9600 |
O1—C2 | 1.364 (3) | C14—H14B | 0.9600 |
O1—H1 | 0.89 (4) | C14—H14C | 0.9600 |
C2—C3 | 1.390 (4) | C12—H12 | 0.9300 |
C5—C4—C3 | 122.3 (3) | C10—C9—H9 | 119.7 |
C5—C4—H4 | 118.9 | C8—C9—H9 | 119.7 |
C3—C4—H4 | 118.9 | C5—C6—C1 | 120.4 (3) |
C7—N1—C8 | 120.5 (2) | C5—C6—H6 | 119.8 |
N1—C7—C1 | 121.6 (2) | C1—C6—H6 | 119.8 |
N1—C7—H7 | 119.2 | C4—C3—C2 | 117.5 (3) |
C1—C7—H7 | 119.2 | C4—C3—C14 | 121.8 (3) |
C6—C5—C4 | 120.0 (3) | C2—C3—C14 | 120.7 (3) |
C6—C5—H5 | 120.0 | C13—C8—C9 | 117.4 (3) |
C4—C5—H5 | 120.0 | C13—C8—N1 | 119.4 (3) |
C6—C1—C2 | 118.7 (2) | C9—C8—N1 | 123.1 (2) |
C6—C1—C7 | 119.3 (3) | C10—C11—C12 | 119.9 (3) |
C2—C1—C7 | 122.0 (2) | C10—C11—H11 | 120.0 |
C2—O1—H1 | 107 (2) | C12—C11—H11 | 120.0 |
O1—C2—C3 | 117.5 (2) | C3—C14—H14A | 109.5 |
O1—C2—C1 | 121.3 (2) | C3—C14—H14B | 109.5 |
C3—C2—C1 | 121.2 (2) | H14A—C14—H14B | 109.5 |
C11—C10—C9 | 120.7 (3) | C3—C14—H14C | 109.5 |
C11—C10—H10 | 119.7 | H14A—C14—H14C | 109.5 |
C9—C10—H10 | 119.7 | H14B—C14—H14C | 109.5 |
C12—C13—C8 | 121.8 (3) | C11—C12—C13 | 119.5 (3) |
C12—C13—Br1 | 119.0 (2) | C11—C12—H12 | 120.2 |
C8—C13—Br1 | 119.2 (2) | C13—C12—H12 | 120.2 |
C10—C9—C8 | 120.6 (3) | ||
C8—N1—C7—C1 | 176.0 (2) | C1—C2—C3—C4 | 0.0 (4) |
C3—C4—C5—C6 | −0.2 (5) | O1—C2—C3—C14 | 0.7 (4) |
N1—C7—C1—C6 | −176.4 (3) | C1—C2—C3—C14 | −179.2 (3) |
N1—C7—C1—C2 | 1.4 (4) | C12—C13—C8—C9 | 1.1 (4) |
C6—C1—C2—O1 | −179.3 (2) | Br1—C13—C8—C9 | 179.5 (2) |
C7—C1—C2—O1 | 2.9 (4) | C12—C13—C8—N1 | 177.7 (2) |
C6—C1—C2—C3 | 0.6 (4) | Br1—C13—C8—N1 | −4.0 (3) |
C7—C1—C2—C3 | −177.2 (2) | C10—C9—C8—C13 | −0.7 (4) |
C11—C10—C9—C8 | 0.1 (5) | C10—C9—C8—N1 | −177.1 (3) |
C4—C5—C6—C1 | 0.8 (5) | C7—N1—C8—C13 | 147.8 (2) |
C2—C1—C6—C5 | −1.0 (4) | C7—N1—C8—C9 | −35.8 (4) |
C7—C1—C6—C5 | 176.9 (3) | C9—C10—C11—C12 | 0.1 (5) |
C5—C4—C3—C2 | −0.2 (4) | C10—C11—C12—C13 | 0.3 (5) |
C5—C4—C3—C14 | 179.0 (3) | C8—C13—C12—C11 | −0.9 (4) |
O1—C2—C3—C4 | 179.9 (2) | Br1—C13—C12—C11 | −179.3 (2) |
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1···N1 | 0.89 (4) | 1.81 (3) | 2.611 (3) | 149 (3) |
Experimental details
Crystal data | |
Chemical formula | C14H12BrNO |
Mr | 290.16 |
Crystal system, space group | Orthorhombic, P212121 |
Temperature (K) | 296 |
a, b, c (Å) | 7.9407 (4), 11.6754 (8), 13.1960 (6) |
V (Å3) | 1223.41 (12) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 3.34 |
Crystal size (mm) | 0.47 × 0.39 × 0.24 |
Data collection | |
Diffractometer | Stoe IPDS 2 |
Absorption correction | Integration (X-RED32; Stoe & Cie, 2002) |
Tmin, Tmax | 0.358, 0.525 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 21115, 2929, 2427 |
Rint | 0.067 |
(sin θ/λ)max (Å−1) | 0.659 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.035, 0.080, 1.07 |
No. of reflections | 2929 |
No. of parameters | 160 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.64, −0.27 |
Absolute structure | Flack (1983), 1229 Friedel pairs |
Absolute structure parameter | −0.003 (10) |
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 |
O1—H1···N1 | 0.89 (4) | 1.81 (3) | 2.611 (3) | 149 (3) |
Acknowledgements
The authors wish to acknowledge the Faculty of Arts and Sciences of Ondokuz Mayıs University, Turkey, for the use of the Stoe IPDS 2 diffractometer (purchased under grant No. F279 of the University Research Grant of Ondokuz Mayıs University).
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 have been used extensively as ligands in the field of coordination chemistry (Calligaris et al., 1972). Schiff bases derived from aromatic amines and aromatic aldehydes have a wide variety of applications in many fields, e.g., biological, inorganic and analytical chemistry (Singh et al., 1975).
Schiff base compounds show photochromism and thermochromism in the solid state by proton transfer from the hydroxyl O atom to the imine N atom.
The overall behaviour of these compounds has been ascribed to a proton-transfer reaction between a phenol-imine and a keto-amine tautomer. In solution, the existence of this tautomerism, which depends on the formation of intramolecular hydrogen bonds, is possible.
X-ray investigation of the title compound, (I), has indicated that the phenol-imine tautomer is favoured over the keto-amine tautomer. Bond lengths (Fig. 1) C2—O1 [1.364 (3) Å], C7—N1 [1.285 (3) Å], C1—C7 [1.451 (4) Å] and C1—C2 [1.403 (4) Å]. The C2—O1 bond length of 1.364 (3) Å indicates a single-bond character, whereas the C7—N1 bond length of 1.285 (3) Å indicates a high degree of double-bond character. Similar results were observed for (E)-3-[(2- fluorophenylimino)methyl]benzene-1,2-diol [C—O = 1.354 (19) Å, C—N = 1.285 (2) Å; Temel et al., 2007].
N···H—O hydrogen bond generate an S(6) ring motif (Fig. 1).