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Acta Cryst. (2012). E68, o175    [ doi:10.1107/S1600536811052275 ]

4-[(E)-(4-Fluorobenzylidene)amino]benzoic acid

B. M. Muñoz-Flores, V. M. J. Pérez, R. L. Santillan, M. E. Ochoa and N. Waksman

Abstract top

In the title compound, C14H10FNO2, the benzene rings make a dihedral angle of 57.50 (13)°, and the molecule has an E configuration about the C=N bond. In the crystal, molecules are linked via pairs of O-H...O hydrogen bonds, forming inversion dimers.

Comment top

Hugo Josef Schiff discovered the condensation a primary amine and a carbonyl compounds (Schiff 1864) afford the corresponding azomethine group. This organic compounds show an important synthetic advantages such as: high yields, simple synthetic route, short-time reactions, and easy isolation. Schiff base compounds have been of great importance in coordination chemistry (Borisova et al. 2007) due to the lone pair of electrons in an sp2 hybridized orbital of nitrogen atom of the azomethine group. On the other hand, it has been reported that organic compounds containing donor and acceptor groups linked through to pi-system delocalized exhibit promising nonlinear optical properties (Innocenzi & Lebeau 2005). We have been focused our attention on synthesis of push-pull organic molecules with no linear optical potential properties (Muñoz-Flores et al. 2008). In continuous with our research, we synthesized the title compound (E)-4-(4-fluorobenzylideneamino)benzoic acid by condensation of 4-fluorobenzaldehyde and 4-aminobenzoic acid. In the present article, the crystal structure of (I) is being reported as shown in Fig 1. The compound, (E)-4-(4-fluorbenzylideneamino)benzoic acid (C14H10N2O2F), displays C1 symmetry. The aromatic rings are not in the same plane, with a dihedral angle of 15.59° between mean planes. The carboxylic group represents a delocalized system with C(14)—O(1) and C(14)—O(2) bond lengths are 1.275 (4) and 1.293 (4) Å, respectively. The azomethine group are in the same plane as the monofluorated ring, probably because the short contact between the C(5)—H(5)···N(1) 2.633 (4) Å, [〈 C—H···N: 96.8°]. The intermolecular O(2)—H(2)···O(1) [2.621 (5)Å (angleO-H···O: 156.30°], hydrogen bond form a dimer with a inversion center as shown in Fig 2.

Related literature top

For the synthesis, properties and uses of 4-(benzylideneamino)benzoic acid, see: Borisova et al. (2007); Schiff (1864); Innocenzi & Lebeau (2005); Muñoz-Flores et al. (2008).

Experimental top

A solution of 4-fluorobenzaldehyde (0.5 g, 4 mmol) and 4-aminobenzoic acid (0.55 g, 4 mmol) in benzene (50 ml) was heated under reflux for 6 h, with a Dean-Stark apparatus used for the azeotropic removal of water and allowed to cool to room temperature. Removal of solvent yielded a pale yellow solid, which was recrystallized from hot benzene (10 ml). Yield: 0.74 g 76%. M. p. 191 °C. 1H NMR (400.13 MHz, MeOD): δ = 4.9 (bs, 1H, OH), 6.62 (d, 3J = 8.4 Hz, 2H, H-11/H-12), 6.80 (d, 3J = 8.4 Hz, 2H, H-9/H-13), 7.10 (t, 3J = 8.4 Hz, 2H, H-2/H-4), 8.05 (d, 3J = 78.4 Hz, 2H, H-1/H-5), 8.53 (s, 1H, H-7). MS (DIP 20 eV) for C14H10N2O2F (f. w: 243.24 g/mol) m/z (%): 243 (100) [M+], 226 (3) [M+—H2O], 198 (3) [M+—CO2], 137 (4) [M+—FC6H8], 121 [M+—C7H6O2].

Refinement top

All C-bonded H atoms were placed in calculated positions and refined as riding to their carrier atoms, with bond lengths fixed to 0.93 (aromatic CH). Isotropic displacement parameters for H atoms were calculated as Uiso(H) = 1.5Ueq(carrier atom.

Computing details top

Data collection: COLLECT (Nonius, 1998); cell refinement: XSCANS (Bruker, 2000); data reduction: XSCANS (Bruker, 2000); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: Mercury (Macrae et al., 2006); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).

Figures top
[Figure 1] Fig. 1. The molecular structure of (I), with atom labels and 50% probability displacement ellipsoids for non-H atoms.
[Figure 2] Fig. 2. Intermolecular interaction via hydrogen bonds.
4-[(E)-(4-Fluorobenzylidene)amino]benzoic acid top
Crystal data top
C14H10FNO2F(000) = 504
Mr = 243.24Dx = 1.406 Mg m−3
Monoclinic, P21/nMelting point: 464 K
Hall symbol: -P 2ynMo Kα radiation, λ = 0.71073 Å
a = 12.2787 (5) ÅCell parameters from 4962 reflections
b = 5.6264 (2) Åθ = 2.9–27.5°
c = 17.2874 (8) ŵ = 0.11 mm−1
β = 105.833 (2)°T = 293 K
V = 1148.99 (8) Å3Prism, yellow
Z = 40.23 × 0.2 × 0.15 mm
Data collection top
Nonius KappaCCD
diffractometer		1226 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tubeRint = 0.186
graphiteθmax = 25.0°, θmin = 3.7°
CCD rotation images, thick slices scansh = −14→14
9975 measured reflectionsk = −6→6
2002 independent reflectionsl = −17→20
Refinement top
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.062Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.191H atoms treated by a mixture of independent and constrained refinement
S = 1.04 w = 1/[σ2(Fo2) + (0.0979P)2 + 0.0699P]
where P = (Fo2 + 2Fc2)/3
2002 reflections(Δ/σ)max < 0.001
166 parametersΔρmax = 0.18 e Å−3
1 restraintΔρmin = −0.21 e Å−3
Crystal data top
C14H10FNO2V = 1148.99 (8) Å3
Mr = 243.24Z = 4
Monoclinic, P21/nMo Kα radiation
a = 12.2787 (5) ŵ = 0.11 mm−1
b = 5.6264 (2) ÅT = 293 K
c = 17.2874 (8) Å0.23 × 0.2 × 0.15 mm
β = 105.833 (2)°
Data collection top
Nonius KappaCCD
diffractometer		1226 reflections with I > 2σ(I)
9975 measured reflectionsRint = 0.186
2002 independent reflectionsθmax = 25.0°
Refinement top
R[F2 > 2σ(F2)] = 0.062H atoms treated by a mixture of independent and constrained refinement
wR(F2) = 0.191Δρmax = 0.18 e Å−3
S = 1.04Δρmin = −0.21 e Å−3
2002 reflectionsAbsolute structure: ?
166 parametersFlack parameter: ?
1 restraintRogers parameter: ?
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/Ueq
C10.7423 (2)0.3339 (5)−0.03261 (18)0.0515 (8)
H10.76230.4696−0.00120.062*
C20.7740 (2)0.3115 (5)−0.10261 (19)0.0565 (8)
H20.81690.4284−0.11850.068*
C30.7407 (3)0.1119 (5)−0.14822 (19)0.0557 (8)
C40.6800 (2)−0.0683 (5)−0.12777 (19)0.0567 (8)
H40.6588−0.2005−0.16070.068*
C50.6511 (2)−0.0474 (5)−0.05617 (18)0.0528 (7)
H50.6116−0.1698−0.03970.063*
C60.6803 (2)0.1547 (4)−0.00823 (17)0.0479 (7)
C70.6428 (2)0.1789 (5)0.06460 (17)0.0506 (7)
H70.61860.04370.08610.061*
C80.6104 (2)0.3845 (4)0.17270 (17)0.0452 (7)
C90.5490 (2)0.5794 (4)0.1872 (2)0.0563 (8)
H90.52470.69390.14740.068*
C100.5237 (2)0.6054 (5)0.25934 (19)0.0534 (8)
H100.48240.73670.26770.064*
C110.5597 (2)0.4361 (4)0.32045 (17)0.0482 (7)
C120.6204 (2)0.2400 (5)0.30522 (19)0.0554 (8)
H120.64460.12510.34490.066*
C130.6449 (2)0.2136 (5)0.23337 (18)0.0546 (8)
H130.68490.08080.22460.065*
C140.5353 (2)0.4651 (5)0.39801 (18)0.0523 (8)
F10.77081 (18)0.0920 (3)−0.21809 (12)0.0827 (7)
N10.64180 (18)0.3768 (4)0.10000 (15)0.0530 (7)
O10.56240 (18)0.3041 (4)0.45179 (13)0.0679 (7)
O20.48502 (19)0.6570 (4)0.41100 (13)0.0675 (7)
H0.487 (3)0.678 (7)0.4597 (9)0.101*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
C10.0568 (16)0.0450 (14)0.0523 (19)−0.0016 (12)0.0142 (13)−0.0017 (12)
C20.0623 (17)0.0512 (15)0.061 (2)0.0016 (13)0.0245 (15)0.0098 (14)
C30.0649 (18)0.0582 (17)0.0471 (19)0.0168 (14)0.0206 (14)0.0037 (14)
C40.0639 (17)0.0483 (15)0.058 (2)0.0042 (13)0.0177 (15)−0.0075 (14)
C50.0526 (15)0.0457 (14)0.062 (2)−0.0007 (12)0.0191 (13)0.0006 (14)
C60.0455 (14)0.0456 (14)0.0520 (19)0.0034 (11)0.0122 (13)0.0026 (12)
C70.0508 (15)0.0520 (15)0.0516 (18)−0.0003 (12)0.0185 (13)0.0061 (13)
C80.0433 (14)0.0493 (15)0.0436 (17)−0.0052 (11)0.0131 (12)−0.0007 (12)
C90.0569 (16)0.0434 (14)0.066 (2)0.0042 (12)0.0116 (14)0.0095 (13)
C100.0558 (16)0.0470 (14)0.058 (2)0.0056 (12)0.0165 (14)0.0001 (13)
C110.0478 (14)0.0478 (14)0.0477 (18)0.0006 (11)0.0106 (12)0.0016 (13)
C120.0628 (17)0.0532 (16)0.0474 (18)0.0097 (13)0.0106 (14)0.0066 (13)
C130.0551 (16)0.0503 (15)0.056 (2)0.0109 (12)0.0112 (14)0.0044 (13)
C140.0467 (14)0.0511 (15)0.056 (2)0.0011 (13)0.0085 (12)−0.0023 (14)
F10.1162 (16)0.0737 (12)0.0682 (14)0.0116 (11)0.0420 (12)0.0015 (10)
N10.0532 (14)0.0494 (13)0.0564 (16)0.0016 (10)0.0150 (11)0.0027 (11)
O10.0832 (15)0.0652 (13)0.0558 (15)0.0141 (11)0.0198 (11)0.0101 (10)
O20.0804 (15)0.0660 (13)0.0549 (15)0.0158 (10)0.0165 (12)−0.0040 (11)
Geometric parameters (Å, °) top
C1—C21.375 (4)C8—C131.400 (4)
C1—C61.396 (4)C8—N11.413 (4)
C1—H10.9300C9—C101.372 (4)
C2—C31.369 (4)C9—H90.9300
C2—H20.9300C10—C111.402 (4)
C3—C41.360 (4)C10—H100.9300
C3—F11.361 (4)C11—C121.396 (4)
C4—C51.383 (4)C11—C141.460 (4)
C4—H40.9300C12—C131.363 (4)
C5—C61.395 (4)C12—H120.9300
C5—H50.9300C13—H130.9300
C6—C71.460 (4)C14—O11.275 (4)
C7—N11.272 (3)C14—O21.294 (3)
C7—H70.9300O2—H0.845 (10)
C8—C91.392 (4)
C2—C1—C6120.6 (3)C9—C8—N1118.5 (2)
C2—C1—H1119.7C13—C8—N1123.0 (2)
C6—C1—H1119.7C10—C9—C8121.0 (3)
C3—C2—C1118.0 (3)C10—C9—H9119.5
C3—C2—H2121.0C8—C9—H9119.5
C1—C2—H2121.0C9—C10—C11120.7 (3)
C4—C3—F1118.0 (3)C9—C10—H10119.7
C4—C3—C2124.1 (3)C11—C10—H10119.7
F1—C3—C2117.9 (3)C12—C11—C10118.0 (3)
C3—C4—C5117.5 (3)C12—C11—C14121.0 (2)
C3—C4—H4121.2C10—C11—C14121.0 (2)
C5—C4—H4121.2C13—C12—C11121.3 (3)
C4—C5—C6120.9 (3)C13—C12—H12119.4
C4—C5—H5119.5C11—C12—H12119.4
C6—C5—H5119.5C12—C13—C8120.7 (3)
C5—C6—C1118.8 (3)C12—C13—H13119.6
C5—C6—C7119.9 (2)C8—C13—H13119.6
C1—C6—C7121.3 (2)O1—C14—O2120.6 (3)
N1—C7—C6122.9 (2)O1—C14—C11120.8 (2)
N1—C7—H7118.5O2—C14—C11118.7 (3)
C6—C7—H7118.5C7—N1—C8119.7 (2)
C9—C8—C13118.3 (3)C14—O2—H114 (3)
C6—C1—C2—C31.6 (4)C9—C10—C11—C12−0.8 (4)
C1—C2—C3—C4−1.4 (4)C9—C10—C11—C14178.6 (2)
C1—C2—C3—F1179.0 (2)C10—C11—C12—C130.4 (4)
F1—C3—C4—C5179.2 (2)C14—C11—C12—C13−179.0 (3)
C2—C3—C4—C5−0.3 (4)C11—C12—C13—C80.5 (4)
C3—C4—C5—C61.9 (4)C9—C8—C13—C12−1.0 (4)
C4—C5—C6—C1−1.8 (4)N1—C8—C13—C12174.3 (2)
C4—C5—C6—C7176.2 (2)C12—C11—C14—O1−4.7 (4)
C2—C1—C6—C50.0 (4)C10—C11—C14—O1175.9 (2)
C2—C1—C6—C7−178.0 (2)C12—C11—C14—O2175.7 (2)
C5—C6—C7—N1−162.4 (3)C10—C11—C14—O2−3.7 (4)
C1—C6—C7—N115.6 (4)C6—C7—N1—C8−176.5 (2)
C13—C8—C9—C100.6 (4)C9—C8—N1—C7−143.9 (3)
N1—C8—C9—C10−174.9 (2)C13—C8—N1—C740.8 (4)
C8—C9—C10—C110.3 (4)
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
O2—H···O1i0.85 (1)1.79 (2)2.601 (3)159 (4)
Symmetry codes: (i) −x+1, −y+1, −z+1.
Table 1
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
O2—H···O1i0.85 (1)1.79 (2)2.601 (3)159 (4)
Symmetry codes: (i) −x+1, −y+1, −z+1.
Acknowledgements top

The authors thank the Programa de Mejoramiento del Profesorado (PROMEP; grant No. 103.5/11/4330) and the Consejo Nacional de Ciencia y Tecnología (CONACYT; grant No. 82605) for financial support.

references
References top

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