N,N'-Bis(2-hydr-oxy-3-eth-oxybenzyl-idene)butane-1,4-diamine.

The title Schiff base compound, C(22)H(28)N(2)O(4), lies across a crystallographic inversion centre and adopts an E configuration with respect to the C=N bond. Pairs of weak inter-molecular C-H⋯O inter-actions link neighbouring mol-ecules into dimers with an R(2) (2)(28) ring motif. The crystal structure is stabilized by inter-molecular C-H⋯π inter-actions. An intramolecular O-H⋯N hydrogen bond occurs.

Related literature

For hydrogen-bond motifs, see: Bernstein et al. (1995 ▶). For information on Schiff base ligands and complexes and their applications, see, for example: Calligaris & Randaccio (1987 ▶); Casellato & Vigato (1977 ▶); Fun & Kia (2008 ▶). For the stability of the temperature controller used for the data collection, see: Cosier & Glazer (1986 ▶).

Experimental

Crystal data

C22H28N2O4

M = 384.46

Triclinic,

a = 6.8647 (2) Å

b = 6.9052 (2) Å

c = 10.8083 (3) Å

α = 92.779 (2)°

β = 99.908 (2)°

γ = 101.239 (2)°

V = 493.23 (2) Å3

Z = 1

Mo Kα radiation

μ = 0.09 mm−1

T = 100 K

0.45 × 0.19 × 0.07 mm

Data collection

Bruker SMART APEXII CCD area-detector diffractometer

Absorption correction: multi-scan (SADABS; Bruker, 2005 ▶) T min = 0.961, T max = 0.994

8962 measured reflections

2954 independent reflections

2157 reflections with I > 2σ(I)

R int = 0.033

Refinement

R[F 2 > 2σ(F 2)] = 0.049

wR(F 2) = 0.131

S = 1.04

2954 reflections

129 parameters

H-atom parameters constrained

Δρmax = 0.43 e Å−3

Δρmin = −0.27 e Å−3

Data collection: APEX2 (Bruker, 2005 ▶); cell refinement: SAINT (Bruker, 2005 ▶); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008 ▶); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL and PLATON (Spek, 2009 ▶).

Crystal structure: contains datablocks global, I. DOI: 10.1107/S1600536809007545/at2734sup1.cif

Structure factors: contains datablocks I. DOI: 10.1107/S1600536809007545/at2734Isup2.hkl

Additional supplementary materials: crystallographic information; 3D view; checkCIF report

C22H28N2O4	Z = 1
Mr = 384.46	F(000) = 206
Triclinic, P1	Dx = 1.294 Mg m−3
Hall symbol: -P 1	Mo Kα radiation, λ = 0.71073 Å
a = 6.8647 (2) Å	Cell parameters from 2475 reflections
b = 6.9052 (2) Å	θ = 2.5–29.4°
c = 10.8083 (3) Å	µ = 0.09 mm−1
α = 92.779 (2)°	T = 100 K
β = 99.908 (2)°	Plate, yellow
γ = 101.239 (2)°	0.45 × 0.19 × 0.07 mm
V = 493.23 (2) Å3

Bruker SMART APEXII CCD area-detector diffractometer	2954 independent reflections
Radiation source: fine-focus sealed tube	2157 reflections with I > 2σ(I)
graphite	Rint = 0.033
φ and ω scans	θmax = 30.4°, θmin = 1.9°
Absorption correction: multi-scan (SADABS; Bruker, 2005)	h = −9→9
Tmin = 0.961, Tmax = 0.994	k = −9→9
8962 measured reflections	l = −14→15

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) = 0.131	H-atom parameters constrained
S = 1.04	w = 1/[σ2(Fo2) + (0.0681P)2 + 0.047P] where P = (Fo2 + 2Fc2)/3
2954 reflections	(Δ/σ)max < 0.001
129 parameters	Δρmax = 0.43 e Å−3
0 restraints	Δρmin = −0.27 e Å−3

Experimental. The crystal was placed in the cold stream of an Oxford Cyrosystems Cobra open-flow nitrogen cryostat (Cosier & Glazer, 1986) operating at 100.0 (1)K.

Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds 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 > 2sigma(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
O1	0.69496 (13)	0.51130 (12)	0.23213 (9)	0.0191 (2)
H1	0.5792	0.4902	0.1870	0.029*
O2	1.05734 (12)	0.52787 (12)	0.36073 (8)	0.0178 (2)
N1	0.35928 (15)	0.30726 (15)	0.10848 (10)	0.0181 (2)
C1	0.75200 (17)	0.33702 (16)	0.25124 (11)	0.0149 (2)
C2	0.94642 (17)	0.34181 (16)	0.32117 (11)	0.0157 (2)
C3	1.00920 (18)	0.16571 (17)	0.34438 (12)	0.0177 (2)
H3A	1.1398	0.1690	0.3921	0.021*
C4	0.88179 (18)	−0.01729 (17)	0.29812 (12)	0.0188 (3)
H4A	0.9259	−0.1372	0.3146	0.023*
C5	0.69162 (18)	−0.02237 (17)	0.22845 (12)	0.0178 (2)
H5A	0.6058	−0.1462	0.1964	0.021*
C6	0.62455 (17)	0.15406 (16)	0.20476 (11)	0.0157 (2)
C7	0.42169 (18)	0.14831 (17)	0.13323 (11)	0.0169 (2)
H7A	0.3346	0.0238	0.1046	0.020*
C8	0.15522 (17)	0.29668 (17)	0.03663 (12)	0.0185 (3)
H8A	0.0561	0.2041	0.0735	0.022*
H8B	0.1478	0.2459	−0.0517	0.022*
C9	0.10389 (17)	0.50109 (17)	0.03934 (11)	0.0170 (2)
H9A	0.2076	0.5946	0.0065	0.020*
H9B	0.1064	0.5488	0.1276	0.020*
C10	1.26442 (17)	0.54481 (17)	0.42136 (12)	0.0182 (3)
H10A	1.3370	0.4755	0.3676	0.022*
H10B	1.2713	0.4857	0.5032	0.022*
C11	1.35712 (19)	0.76329 (19)	0.44083 (13)	0.0227 (3)
H11A	1.5003	0.7823	0.4795	0.034*
H11B	1.2866	0.8291	0.4964	0.034*
H11C	1.3448	0.8205	0.3593	0.034*

	U11	U22	U33	U12	U13	U23
O1	0.0164 (4)	0.0136 (4)	0.0265 (5)	0.0048 (3)	−0.0003 (3)	0.0029 (3)
O2	0.0134 (4)	0.0146 (4)	0.0234 (5)	0.0009 (3)	0.0006 (3)	0.0005 (3)
N1	0.0145 (5)	0.0188 (5)	0.0215 (5)	0.0055 (4)	0.0021 (4)	0.0024 (4)
C1	0.0163 (6)	0.0129 (5)	0.0168 (6)	0.0040 (4)	0.0054 (4)	0.0031 (4)
C2	0.0154 (6)	0.0149 (5)	0.0172 (6)	0.0021 (4)	0.0051 (4)	0.0015 (4)
C3	0.0143 (6)	0.0190 (6)	0.0203 (6)	0.0050 (4)	0.0023 (5)	0.0029 (4)
C4	0.0194 (6)	0.0149 (5)	0.0237 (6)	0.0069 (4)	0.0044 (5)	0.0039 (4)
C5	0.0175 (6)	0.0133 (5)	0.0223 (6)	0.0030 (4)	0.0029 (5)	0.0015 (4)
C6	0.0142 (6)	0.0157 (5)	0.0176 (6)	0.0038 (4)	0.0033 (4)	0.0021 (4)
C7	0.0154 (6)	0.0154 (5)	0.0192 (6)	0.0019 (4)	0.0027 (5)	0.0011 (4)
C8	0.0137 (6)	0.0187 (6)	0.0221 (6)	0.0043 (4)	0.0001 (5)	0.0009 (5)
C9	0.0157 (6)	0.0176 (5)	0.0186 (6)	0.0055 (4)	0.0032 (5)	0.0025 (4)
C10	0.0128 (6)	0.0193 (6)	0.0221 (6)	0.0029 (4)	0.0030 (5)	0.0009 (4)
C11	0.0150 (6)	0.0219 (6)	0.0291 (7)	0.0006 (4)	0.0021 (5)	0.0027 (5)

O1—C1	1.3507 (12)	C6—C7	1.4641 (15)
O1—H1	0.8400	C7—H7A	0.9500
O2—C2	1.3662 (13)	C8—C9	1.5201 (15)
O2—C10	1.4391 (13)	C8—H8A	0.9900
N1—C7	1.2776 (14)	C8—H8B	0.9900
N1—C8	1.4666 (14)	C9—C9i	1.527 (2)
C1—C6	1.4037 (16)	C9—H9A	0.9900
C1—C2	1.4096 (16)	C9—H9B	0.9900
C2—C3	1.3871 (15)	C10—C11	1.5081 (17)
C3—C4	1.4033 (17)	C10—H10A	0.9900
C3—H3A	0.9500	C10—H10B	0.9900
C4—C5	1.3833 (16)	C11—H11A	0.9800
C4—H4A	0.9500	C11—H11B	0.9800
C5—C6	1.4036 (15)	C11—H11C	0.9800
C5—H5A	0.9500
C1—O1—H1	109.5	N1—C8—C9	109.97 (10)
C2—O2—C10	117.43 (9)	N1—C8—H8A	109.7
C7—N1—C8	120.11 (11)	C9—C8—H8A	109.7
O1—C1—C6	122.32 (10)	N1—C8—H8B	109.7
O1—C1—C2	118.03 (10)	C9—C8—H8B	109.7
C6—C1—C2	119.65 (10)	H8A—C8—H8B	108.2
O2—C2—C3	125.83 (11)	C8—C9—C9i	111.80 (13)
O2—C2—C1	114.48 (9)	C8—C9—H9A	109.3
C3—C2—C1	119.70 (11)	C9i—C9—H9A	109.3
C2—C3—C4	120.70 (11)	C8—C9—H9B	109.3
C2—C3—H3A	119.7	C9i—C9—H9B	109.3
C4—C3—H3A	119.7	H9A—C9—H9B	107.9
C5—C4—C3	119.72 (11)	O2—C10—C11	106.44 (9)
C5—C4—H4A	120.1	O2—C10—H10A	110.4
C3—C4—H4A	120.1	C11—C10—H10A	110.4
C4—C5—C6	120.48 (11)	O2—C10—H10B	110.4
C4—C5—H5A	119.8	C11—C10—H10B	110.4
C6—C5—H5A	119.8	H10A—C10—H10B	108.6
C5—C6—C1	119.75 (10)	C10—C11—H11A	109.5
C5—C6—C7	120.42 (11)	C10—C11—H11B	109.5
C1—C6—C7	119.83 (10)	H11A—C11—H11B	109.5
N1—C7—C6	121.38 (11)	C10—C11—H11C	109.5
N1—C7—H7A	119.3	H11A—C11—H11C	109.5
C6—C7—H7A	119.3	H11B—C11—H11C	109.5
C10—O2—C2—C3	6.39 (17)	C4—C5—C6—C7	−178.73 (11)
C10—O2—C2—C1	−173.76 (10)	O1—C1—C6—C5	−179.51 (11)
O1—C1—C2—O2	−0.84 (16)	C2—C1—C6—C5	0.09 (17)
C6—C1—C2—O2	179.55 (10)	O1—C1—C6—C7	−0.25 (17)
O1—C1—C2—C3	179.02 (10)	C2—C1—C6—C7	179.35 (10)
C6—C1—C2—C3	−0.60 (17)	C8—N1—C7—C6	−179.99 (10)
O2—C2—C3—C4	−179.65 (11)	C5—C6—C7—N1	−178.57 (11)
C1—C2—C3—C4	0.51 (18)	C1—C6—C7—N1	2.18 (18)
C2—C3—C4—C5	0.10 (18)	C7—N1—C8—C9	170.13 (11)
C3—C4—C5—C6	−0.61 (18)	N1—C8—C9—C9i	177.44 (12)
C4—C5—C6—C1	0.51 (18)	C2—O2—C10—C11	173.37 (10)

D—H···A	D—H	H···A	D···A	D—H···A
O1—H1···N1	0.84	1.82	2.5638 (14)	147
C5—H5A···O1ii	0.95	2.59	3.2268 (14)	125
C11—H11B···Cg1iii	0.98	2.96	3.5403 (15)	145

Table 1

Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O1—H1⋯N1	0.84	1.82	2.5638 (14)	147
C5—H5A⋯O1i	0.95	2.59	3.2268 (14)	125
C11—H11B⋯Cg1ii	0.98	2.96	3.5403 (15)	145

Symmetry codes: (i) ; (ii) . Cg1 is the centroid of the C1–C6 benzene ring.