(E)-2-Meth­­oxy-6-[(5-methyl­isoxazol-3-yl)imino­meth­yl]phenol

In the title mol­ecule, C₁₂H₁₂N₂O₃, the benzene and isoxazole rings form a dihedral angle of 5.9 (6)°. The hydr­oxy group is involved in an intra­molecular O—H⋯N hydrogen bond [O⋯N = 2.616 (5) Å], resulting in approximate planarity of the mol­ecular skeleton. In the crystal structure, mol­ecules related by translation along the c axis are stacked into columns, the shortest inter­molecular C⋯C distance being 3.298 (6) Å.

Related literature

For related crystal structures, see Li et al. (2007). For general background, see Garnovskii et al. (1993).

Experimental

Crystal data

• C₁₂H₁₂N₂O₃

• M_r = 232.24

• Orthorhombic, P n a 2₁

• a = 22.254 (5) Å

• b = 10.178 (5) Å

• c = 4.836 (2) Å

• V = 1095.4 (8) ų

• Z = 4

• Mo Kα radiation

• μ = 0.10 mm⁻¹

• T = 273 (2) K

• 0.12 × 0.10 × 0.08 mm

Data collection

• Bruker SMART CCD area-detector diffractometer

• Absorption correction: multi-scan (SADABS; Sheldrick, 1996) T_min = 0.988, T_max = 0.992

• 3720 measured reflections

• 1079 independent reflections

• 651 reflections with I > 2σ(I)

• R_int = 0.069

Refinement

• R[F² > 2σ(F²)] = 0.050

• wR(F²) = 0.122

• S = 1.02

• 1079 reflections

• 156 parameters

• H-atom parameters constrained

• Δρ_max = 0.24 e Å⁻³

• Δρ_min = −0.19 e Å⁻³

Table 1
Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O1—H1⋯N1	0.82	1.89	2.616 (5)	147

Data collection: SMART (Siemens, 1996); cell refinement: SMART; data reduction: SAINT (Siemens, 1996); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.

Supporting information

S1. Comment

Recently, a number of Schiff-bases have been investigated in terms of their crystallography and coordination chemistry (Garnovskii et al., 1993). In continuation of our studies of Schiff-bases, we report here the synthesis and crystal structure of the title compound, (I).

In (I) (Fig. 1), the geometric parameters are in good agreement with those found in 2,4-di-tert-butyl-6-(4-chlorophenyliminomethyl)phenol (Li et al., 2007). The benzene and the isoxazole rings make a dihedral angle of 5.9 (6)°. The hydroxy group is involved in intramolecular O—H···N hydrogen bond (Table 2). In the crystal, the molecules related by translation along c axis are stacked into columns with the shortest intermolecular C···C distance of 3.298 (6) Å (Table 1), suggesting an existence of π···π interactions.

Related literature

For related crystal structures, see Li et al. (2007). For general background, see Garnovskii et al. (1993).

S2. Experimental

The title compound was synthesized by the reaction of 2-hydroxy-3-methoxybenzaldehyde (0.152 g, 1 mmol) and 5-methylisoxazol-3-amine (0.098 g, 1 mmol) in ethanol solution and stirred under reflux conditions (353 K) for 6 h. When cooled to room temperature the solution was filtered and after a week orange crystals suitable for X-ray diffraction study were obtained. Yield, 0.186 g, 80%. m.p. 365–367 K.

Analysis found: C 61.98, H 5.25, N 12.04%; C₁₂H₁₂N₂O₃ requires: C 62.02, H 5.21, N 12.06%.

S3. Refinement

The H atoms were geometrically positioned (C—H 0.93–0.96 Å, O—H = 0.82 Å) and refined in a riding-model approximation with U_iso(H) = 1.2U_eq(C-aromatic) and U_iso(H) = 1.5U_eq(C-methyl and O). Due to the absence of any significant anomalous scatterers in the molecule, the 758 Friedel pairs were merged before the final refinement.

Computing details

Data collection: SMART (Siemens, 1996); cell refinement: SMART (Siemens, 1996); data reduction: SAINT (Siemens, 1996); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).

Figures

Fig. 1. The molecular structure showing 30% probability displacement ellipsoids and the atom-numbering scheme.

(E)-2-Methoxy-6-[(5-methylisoxazol-3-yl)iminomethyl]phenol

Crystal data

C12H12N2O3	F(000) = 488
Mr = 232.24	Dx = 1.408 Mg m^−3 Dm = 1.408 Mg m^−3 Dm measured by not measured
Orthorhombic, Pna21	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: P 2c -2n	Cell parameters from 401 reflections
a = 22.254 (5) Å	θ = 2.7–18.4°
b = 10.178 (5) Å	µ = 0.10 mm^−1
c = 4.836 (2) Å	T = 273 K
V = 1095.4 (8) Å^3	Block, orange
Z = 4	0.12 × 0.10 × 0.08 mm

Data collection

Bruker SMART CCD area-detector diffractometer	1079 independent reflections
Radiation source: sealed tube	651 reflections with I > 2σ(I)
Graphite monochromator	Rint = 0.069
ϕ and ω scans	θmax = 25.1°, θmin = 1.8°
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	h = −26→12
Tmin = 0.988, Tmax = 0.992	k = −11→10
3720 measured reflections	l = −5→5

Refinement

Refinement on F^2	Secondary atom site location: difference Fourier map
Least-squares matrix: full	Hydrogen site location: inferred from neighbouring sites
R[F^2 > 2σ(F^2)] = 0.050	H-atom parameters constrained
wR(F^2) = 0.122	w = 1/[σ^2(Fo^2) + (0.052P)^2] where P = (Fo^2 + 2Fc^2)/3
S = 1.02	(Δ/σ)max < 0.001
1079 reflections	Δρmax = 0.24 e Å^−3
156 parameters	Δρmin = −0.19 e Å^−3
0 restraints	Extinction correction: SHELXL97 (Sheldrick, 2008), Fc^*=kFc[1+0.001xFc^2λ^3/sin(2θ)]^-1/4
Primary atom site location: structure-invariant direct methods	Extinction coefficient: 0.009 (3)

Special details

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.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Ų)

	x	y	z	Uiso*/Ueq
O1	0.38927 (16)	0.1624 (3)	0.1475 (8)	0.0589 (12)
H1	0.3605	0.1711	0.0433	0.088*
O2	0.47481 (17)	0.1609 (3)	0.5178 (8)	0.0642 (12)
O3	0.19927 (17)	0.2331 (3)	−0.6386 (9)	0.0630 (12)
N1	0.30586 (18)	0.2894 (4)	−0.1253 (10)	0.0435 (11)
N2	0.2451 (2)	0.1937 (4)	−0.4528 (11)	0.0600 (14)
C1	0.3990 (2)	0.2760 (5)	0.2836 (10)	0.0439 (14)
C2	0.4440 (2)	0.2775 (5)	0.4844 (12)	0.0493 (15)
C3	0.4554 (2)	0.3904 (5)	0.6332 (11)	0.0507 (14)
H3	0.4856	0.3913	0.7660	0.061*
C4	0.4214 (2)	0.5035 (5)	0.5842 (12)	0.0521 (15)
H4	0.4286	0.5792	0.6867	0.062*
C5	0.3773 (2)	0.5031 (5)	0.3843 (12)	0.0488 (13)
H5	0.3551	0.5790	0.3520	0.059*
C6	0.3655 (2)	0.3901 (5)	0.2295 (10)	0.0408 (13)
C7	0.5192 (3)	0.1552 (6)	0.7308 (13)	0.0709 (19)
H7A	0.5505	0.2174	0.6920	0.106*
H7B	0.5359	0.0683	0.7384	0.106*
H7C	0.5009	0.1760	0.9054	0.106*
C8	0.3197 (2)	0.3922 (5)	0.0215 (11)	0.0448 (13)
H8	0.2990	0.4702	−0.0098	0.054*
C9	0.2608 (2)	0.3021 (5)	−0.3245 (11)	0.0457 (14)
C10	0.2266 (2)	0.4109 (5)	−0.4155 (12)	0.0512 (15)
H10	0.2295	0.4971	−0.3536	0.061*
C11	0.1892 (2)	0.3643 (5)	−0.6087 (11)	0.0464 (14)
C12	0.1426 (2)	0.4195 (6)	−0.7923 (12)	0.0658 (18)
H12A	0.1372	0.3628	−0.9489	0.099*
H12B	0.1548	0.5050	−0.8544	0.099*
H12C	0.1054	0.4266	−0.6928	0.099*

Atomic displacement parameters (Ų)

	U^11	U^22	U^33	U^12	U^13	U^23
O1	0.069 (3)	0.040 (2)	0.068 (3)	0.0036 (19)	−0.016 (2)	−0.009 (2)
O2	0.068 (3)	0.056 (2)	0.069 (3)	0.016 (2)	−0.019 (2)	−0.004 (2)
O3	0.070 (3)	0.049 (2)	0.070 (3)	−0.006 (2)	−0.013 (2)	−0.007 (2)
N1	0.045 (3)	0.036 (2)	0.049 (2)	−0.002 (2)	−0.002 (2)	−0.003 (2)
N2	0.068 (3)	0.041 (3)	0.071 (3)	−0.009 (2)	−0.027 (3)	0.002 (3)
C1	0.046 (3)	0.041 (3)	0.045 (3)	−0.009 (3)	−0.004 (3)	0.000 (3)
C2	0.049 (4)	0.044 (3)	0.056 (4)	0.003 (3)	0.007 (3)	−0.001 (3)
C3	0.048 (3)	0.055 (3)	0.049 (3)	−0.003 (3)	−0.002 (3)	−0.005 (3)
C4	0.060 (4)	0.044 (3)	0.052 (3)	−0.009 (3)	0.006 (3)	−0.002 (3)
C5	0.056 (3)	0.036 (3)	0.055 (3)	−0.001 (3)	0.000 (4)	−0.004 (3)
C6	0.041 (3)	0.034 (3)	0.047 (3)	0.002 (3)	0.003 (3)	0.001 (2)
C7	0.069 (4)	0.078 (4)	0.065 (4)	0.027 (3)	−0.011 (4)	−0.002 (4)
C8	0.042 (3)	0.038 (3)	0.055 (3)	0.004 (3)	0.004 (3)	0.000 (3)
C9	0.050 (4)	0.038 (3)	0.049 (3)	−0.007 (3)	0.008 (3)	−0.003 (3)
C10	0.056 (4)	0.039 (3)	0.059 (4)	0.007 (3)	−0.003 (3)	−0.007 (3)
C11	0.047 (4)	0.045 (3)	0.048 (3)	−0.001 (3)	0.007 (3)	−0.006 (3)
C12	0.064 (4)	0.073 (4)	0.061 (4)	0.008 (3)	−0.011 (4)	−0.005 (4)

Geometric parameters (Å, º)

O1—C1	1.348 (5)	C4—H4	0.9300
O1—H1	0.8200	C5—C6	1.397 (7)
O2—C2	1.379 (6)	C5—H5	0.9300
O2—C7	1.428 (6)	C6—C8	1.433 (7)
O3—C11	1.362 (6)	C7—H7A	0.9600
O3—N2	1.417 (6)	C7—H7B	0.9600
N1—C8	1.301 (6)	C7—H7C	0.9600
N1—C9	1.397 (7)	C8—H8	0.9300
N2—C9	1.313 (5)	C9—C10	1.413 (6)
C1—C2	1.395 (7)	C10—C11	1.338 (7)
C1—C6	1.405 (7)	C10—H10	0.9300
C2—C3	1.379 (7)	C11—C12	1.477 (7)
C3—C4	1.397 (7)	C12—H12A	0.9600
C3—H3	0.9300	C12—H12B	0.9600
C4—C5	1.377 (7)	C12—H12C	0.9600
C4···C8^i	3.298 (6)	C6···C9^i	3.299 (6)
C1—O1—H1	109.5	O2—C7—H7B	109.5
C2—O2—C7	117.5 (4)	H7A—C7—H7B	109.5
C11—O3—N2	109.2 (4)	O2—C7—H7C	109.5
C8—N1—C9	118.2 (4)	H7A—C7—H7C	109.5
C9—N2—O3	104.7 (4)	H7B—C7—H7C	109.5
O1—C1—C2	117.7 (5)	N1—C8—C6	122.6 (5)
O1—C1—C6	122.2 (5)	N1—C8—H8	118.7
C2—C1—C6	120.1 (5)	C6—C8—H8	118.7
O2—C2—C3	124.4 (5)	N2—C9—N1	116.0 (5)
O2—C2—C1	115.4 (5)	N2—C9—C10	111.6 (5)
C3—C2—C1	120.2 (5)	N1—C9—C10	132.3 (5)
C2—C3—C4	119.9 (5)	C11—C10—C9	106.0 (5)
C2—C3—H3	120.0	C11—C10—H10	127.0
C4—C3—H3	120.0	C9—C10—H10	127.0
C5—C4—C3	120.1 (5)	C10—C11—O3	108.6 (5)
C5—C4—H4	119.9	C10—C11—C12	136.3 (5)
C3—C4—H4	119.9	O3—C11—C12	115.1 (5)
C4—C5—C6	120.8 (5)	C11—C12—H12A	109.5
C4—C5—H5	119.6	C11—C12—H12B	109.5
C6—C5—H5	119.6	H12A—C12—H12B	109.5
C5—C6—C1	118.8 (5)	C11—C12—H12C	109.5
C5—C6—C8	119.8 (5)	H12A—C12—H12C	109.5
C1—C6—C8	121.4 (5)	H12B—C12—H12C	109.5
O2—C7—H7A	109.5
C11—O3—N2—C9	−0.8 (5)	O1—C1—C6—C8	−1.2 (7)
C7—O2—C2—C3	3.5 (8)	C2—C1—C6—C8	179.0 (4)
C7—O2—C2—C1	−176.8 (4)	C9—N1—C8—C6	−179.5 (4)
O1—C1—C2—O2	1.2 (7)	C5—C6—C8—N1	−178.6 (5)
C6—C1—C2—O2	−179.0 (5)	C1—C6—C8—N1	1.0 (7)
O1—C1—C2—C3	−179.0 (5)	O3—N2—C9—N1	179.6 (4)
C6—C1—C2—C3	0.8 (7)	O3—N2—C9—C10	0.8 (6)
O2—C2—C3—C4	−179.8 (5)	C8—N1—C9—N2	−175.0 (5)
C1—C2—C3—C4	0.5 (8)	C8—N1—C9—C10	3.5 (8)
C2—C3—C4—C5	−1.1 (8)	N2—C9—C10—C11	−0.5 (6)
C3—C4—C5—C6	0.5 (8)	N1—C9—C10—C11	−179.0 (5)
C4—C5—C6—C1	0.8 (7)	C9—C10—C11—O3	−0.1 (5)
C4—C5—C6—C8	−179.6 (4)	C9—C10—C11—C12	−178.7 (6)
O1—C1—C6—C5	178.4 (5)	N2—O3—C11—C10	0.6 (5)
C2—C1—C6—C5	−1.4 (7)	N2—O3—C11—C12	179.5 (4)

Symmetry code: (i) x, y, z+1.

Hydrogen-bond geometry (Å, º)

D—H···A	D—H	H···A	D···A	D—H···A
O1—H1···N1	0.82	1.89	2.616 (5)	147