organic compounds
6,6′-Diethoxy-2,2′-[4-methyl-1,2-phenylenebis(nitrilomethanylylidene)]diphenol acetonitrile monosolvate
aLiaocheng University, Department of Chemistry, Liaocheng, Shandong Province 252059, People's Republic of China
*Correspondence e-mail: drzengsy@163.com
The title solvated Schiff base compound, C25H26N2O4·CH3CN, possesses an O2N2 donor set affording a potentially tetradentate metal complex ligand. The central ring makes dihedral angles of 6.7 (3) and 48.4 (2)° with the pendant rings. Intramolecular N—H⋯O hydrogen-bonding interactions are observed.
CCDC reference: 967518
Related literature
For background to the properties of tetradentate Schiff-base ligands with O2N2 donor sets, see Zhang et al. (2009); Nayka et al. (2006). For related crystal structures, see Liu et al. (2006); Kargar et al. (2009).
Experimental
Crystal data
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Data collection: APEX2 (Bruker, 2004); cell SAINT-Plus (Bruker, 2001); data reduction: SAINT-Plus; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008b; program(s) used to refine structure: SHELXL97 (Sheldrick, 2008b); molecular graphics: SHELXTL (Sheldrick, 2008b); software used to prepare material for publication: SHELXTL.
Supporting information
CCDC reference: 967518
10.1107/S1600536813028845/hg5352sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536813028845/hg5352Isup2.hkl
The Schiff base ligand was prepared by condensation 4-methyl-1,2-phenylenediamine (10 mmol, 1.22 g) and 2-hydroxy-3-ethoxybenzaldehyde (20 mmol, 3.32 g) in a mixture of ethanol and acetonitrile(1:1). The mixture formed was allowed to partial evaporate in air for about one week to produce crystals suitable for X-ray diffraction.
All the H atoms bonded to C atoms were placed using the HFIX commands in SHELXL-97, with C—H distances of 0.93, 0.96, 0.97Å, and were allowed for as riding atoms with Uiso(H) = 1.2Ueq(C) and Uiso(H) = 1.5Ueq(C) (methyl) respectively. The hydroxyl protons were located from difference Fourier maps with the O—H bond length restrained to 0.82 Å and was allowed for as riding atoms with Uiso(H) = 1.2Ueq(O).
Data collection: APEX2 (Bruker, 2004); cell
SAINT-Plus (Bruker, 2001); data reduction: SAINT-Plus (Bruker, 2001); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008b; program(s) used to refine structure: SHELXL97 (Sheldrick, 2008b); molecular graphics: SHELXTL (Sheldrick, 2008b); software used to prepare material for publication: SHELXTL (Sheldrick, 2008b).Fig. 1. The structure of the title compound with the atom-labelling scheme. Displacement ellipsoids are drawn at the 30% probability level. The solvent molecule has been omitted for clarity. |
C25H26N2O4·C2H3N | F(000) = 976 |
Mr = 459.53 | Dx = 1.225 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 1236 reflections |
a = 11.580 (3) Å | θ = 2.3–26.3° |
b = 24.999 (7) Å | µ = 0.08 mm−1 |
c = 8.995 (3) Å | T = 293 K |
β = 106.891 (6)° | Block, orange |
V = 2491.7 (12) Å3 | 0.17 × 0.11 × 0.09 mm |
Z = 4 |
Bruker APEXII CCD area-detector diffractometer | 4387 independent reflections |
Radiation source: fine-focus sealed tube | 2242 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.122 |
ϕ and ω scans | θmax = 25.0°, θmin = 1.8° |
Absorption correction: multi-scan (SADABS; Sheldrick, 2008a) | h = −13→12 |
Tmin = 0.986, Tmax = 0.993 | k = −29→29 |
12206 measured reflections | l = −4→10 |
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)] = 0.061 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.171 | H-atom parameters constrained |
S = 0.91 | w = 1/[σ2(Fo2) + (0.0517P)2] where P = (Fo2 + 2Fc2)/3 |
4387 reflections | (Δ/σ)max = 0.011 |
313 parameters | Δρmax = 0.14 e Å−3 |
0 restraints | Δρmin = −0.17 e Å−3 |
C25H26N2O4·C2H3N | V = 2491.7 (12) Å3 |
Mr = 459.53 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 11.580 (3) Å | µ = 0.08 mm−1 |
b = 24.999 (7) Å | T = 293 K |
c = 8.995 (3) Å | 0.17 × 0.11 × 0.09 mm |
β = 106.891 (6)° |
Bruker APEXII CCD area-detector diffractometer | 4387 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 2008a) | 2242 reflections with I > 2σ(I) |
Tmin = 0.986, Tmax = 0.993 | Rint = 0.122 |
12206 measured reflections |
R[F2 > 2σ(F2)] = 0.061 | 0 restraints |
wR(F2) = 0.171 | H-atom parameters constrained |
S = 0.91 | Δρmax = 0.14 e Å−3 |
4387 reflections | Δρmin = −0.17 e Å−3 |
313 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 | ||
O1 | 0.7285 (3) | 0.11495 (14) | 0.4282 (4) | 0.0813 (10) | |
H1 | 0.7486 | 0.0945 | 0.3688 | 0.122* | |
O2 | 0.5747 (3) | 0.09311 (14) | 0.0478 (4) | 0.0904 (11) | |
H2 | 0.6313 | 0.0732 | 0.0889 | 0.136* | |
O3 | 0.6804 (4) | 0.19431 (15) | 0.5910 (4) | 0.1040 (13) | |
O4 | 0.3638 (3) | 0.13571 (16) | −0.0824 (4) | 0.1035 (13) | |
N1 | 0.8803 (3) | 0.06746 (18) | 0.3066 (4) | 0.0636 (11) | |
N2 | 0.7374 (3) | 0.02192 (14) | 0.0410 (4) | 0.0625 (11) | |
N3 | 0.2332 (5) | 0.1357 (3) | 0.3047 (7) | 0.163 (3) | |
C1 | 0.9221 (5) | 0.1516 (2) | 0.4400 (5) | 0.0645 (13) | |
C2 | 0.8122 (5) | 0.1537 (2) | 0.4743 (6) | 0.0672 (13) | |
C3 | 0.7888 (6) | 0.1968 (2) | 0.5600 (6) | 0.0740 (15) | |
C4 | 0.8739 (6) | 0.2366 (2) | 0.6093 (6) | 0.0879 (17) | |
H4 | 0.8591 | 0.2649 | 0.6682 | 0.105* | |
C5 | 0.9807 (6) | 0.2343 (3) | 0.5712 (7) | 0.0958 (19) | |
H5 | 1.0361 | 0.2621 | 0.6017 | 0.115* | |
C6 | 1.0070 (5) | 0.1926 (2) | 0.4900 (6) | 0.0831 (16) | |
H6 | 1.0806 | 0.1912 | 0.4679 | 0.100* | |
C7 | 0.9526 (4) | 0.1072 (2) | 0.3588 (5) | 0.0668 (14) | |
H7 | 1.0283 | 0.1068 | 0.3424 | 0.080* | |
C8 | 0.6624 (6) | 0.2277 (3) | 0.7098 (7) | 0.136 (2) | |
H8A | 0.6499 | 0.2643 | 0.6729 | 0.163* | |
H8B | 0.7333 | 0.2268 | 0.7995 | 0.163* | |
C9 | 0.5578 (7) | 0.2092 (3) | 0.7534 (9) | 0.161 (3) | |
H9A | 0.4886 | 0.2086 | 0.6632 | 0.242* | |
H9B | 0.5428 | 0.2330 | 0.8296 | 0.242* | |
H9C | 0.5727 | 0.1738 | 0.7961 | 0.242* | |
C10 | 0.3962 (5) | 0.0948 (2) | −0.1623 (7) | 0.0775 (15) | |
C11 | 0.5093 (4) | 0.0717 (2) | −0.0890 (6) | 0.0646 (13) | |
C12 | 0.5510 (4) | 0.0303 (2) | −0.1607 (6) | 0.0676 (14) | |
C13 | 0.4802 (5) | 0.0110 (2) | −0.3033 (6) | 0.1016 (19) | |
H13 | 0.5082 | −0.0169 | −0.3521 | 0.122* | |
C14 | 0.3700 (5) | 0.0329 (3) | −0.3710 (7) | 0.1034 (19) | |
H14 | 0.3226 | 0.0196 | −0.4656 | 0.124* | |
C15 | 0.3277 (5) | 0.0744 (2) | −0.3020 (7) | 0.0897 (17) | |
H15 | 0.2520 | 0.0889 | −0.3501 | 0.108* | |
C16 | 0.6679 (5) | 0.00675 (19) | −0.0889 (6) | 0.0761 (15) | |
H16 | 0.6935 | −0.0210 | −0.1406 | 0.091* | |
C17 | 0.2618 (5) | 0.1673 (2) | −0.1656 (7) | 0.119 (2) | |
H17A | 0.1879 | 0.1467 | −0.1840 | 0.142* | |
H17B | 0.2705 | 0.1785 | −0.2650 | 0.142* | |
C18 | 0.2581 (6) | 0.2146 (3) | −0.0671 (8) | 0.164 (3) | |
H18A | 0.2607 | 0.2029 | 0.0355 | 0.246* | |
H18B | 0.1851 | 0.2343 | −0.1116 | 0.246* | |
H18C | 0.3264 | 0.2371 | −0.0615 | 0.246* | |
C19 | 0.9238 (4) | 0.0225 (2) | 0.2448 (6) | 0.0616 (13) | |
C20 | 0.8512 (4) | −0.0026 (2) | 0.1097 (6) | 0.0606 (13) | |
C21 | 0.8941 (4) | −0.0476 (2) | 0.0549 (5) | 0.0726 (14) | |
H21 | 0.8461 | −0.0644 | −0.0338 | 0.087* | |
C22 | 1.0074 (5) | −0.0684 (2) | 0.1290 (6) | 0.0714 (15) | |
C23 | 1.0780 (5) | −0.0442 (2) | 0.2597 (7) | 0.0825 (16) | |
H23 | 1.1537 | −0.0582 | 0.3102 | 0.099* | |
C24 | 1.0373 (4) | 0.0007 (2) | 0.3168 (5) | 0.0755 (15) | |
H24 | 1.0866 | 0.0171 | 0.4056 | 0.091* | |
C25 | 1.0510 (4) | −0.1184 (2) | 0.0656 (6) | 0.1002 (18) | |
H25A | 1.1363 | −0.1158 | 0.0802 | 0.150* | |
H25B | 1.0097 | −0.1218 | −0.0432 | 0.150* | |
H25C | 1.0345 | −0.1493 | 0.1197 | 0.150* | |
C26 | 0.4564 (5) | 0.1408 (2) | 0.3195 (7) | 0.142 (3) | |
H26A | 0.4775 | 0.1771 | 0.3037 | 0.213* | |
H26B | 0.4710 | 0.1184 | 0.2402 | 0.213* | |
H26C | 0.5046 | 0.1287 | 0.4196 | 0.213* | |
C27 | 0.3299 (7) | 0.1382 (2) | 0.3121 (7) | 0.107 (2) |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.062 (2) | 0.089 (3) | 0.090 (3) | −0.013 (2) | 0.0185 (18) | −0.025 (2) |
O2 | 0.078 (3) | 0.113 (3) | 0.068 (2) | 0.030 (2) | 0.001 (2) | −0.010 (2) |
O3 | 0.091 (3) | 0.121 (3) | 0.103 (3) | −0.009 (2) | 0.032 (2) | −0.045 (2) |
O4 | 0.088 (3) | 0.118 (3) | 0.095 (3) | 0.047 (2) | 0.013 (2) | 0.004 (3) |
N1 | 0.059 (3) | 0.070 (3) | 0.060 (3) | 0.003 (2) | 0.013 (2) | 0.004 (2) |
N2 | 0.052 (3) | 0.068 (3) | 0.061 (3) | 0.004 (2) | 0.006 (2) | 0.004 (2) |
N3 | 0.094 (4) | 0.244 (7) | 0.155 (5) | −0.029 (5) | 0.045 (5) | 0.001 (5) |
C1 | 0.073 (4) | 0.066 (4) | 0.046 (3) | −0.008 (3) | 0.006 (3) | −0.002 (3) |
C2 | 0.059 (4) | 0.072 (4) | 0.063 (3) | 0.000 (3) | 0.006 (3) | 0.006 (3) |
C3 | 0.079 (4) | 0.080 (4) | 0.055 (4) | 0.008 (4) | 0.007 (3) | −0.008 (3) |
C4 | 0.106 (5) | 0.069 (4) | 0.074 (4) | −0.003 (4) | 0.003 (4) | −0.011 (3) |
C5 | 0.085 (5) | 0.090 (5) | 0.096 (5) | −0.025 (4) | 0.000 (4) | 0.009 (4) |
C6 | 0.082 (4) | 0.083 (4) | 0.075 (4) | −0.008 (4) | 0.008 (3) | 0.012 (3) |
C7 | 0.057 (3) | 0.089 (4) | 0.052 (3) | −0.001 (3) | 0.011 (3) | 0.008 (3) |
C8 | 0.141 (6) | 0.161 (7) | 0.106 (5) | 0.008 (6) | 0.035 (5) | −0.044 (5) |
C9 | 0.178 (7) | 0.151 (7) | 0.192 (7) | −0.023 (5) | 0.112 (6) | −0.049 (5) |
C10 | 0.065 (4) | 0.089 (4) | 0.074 (4) | 0.007 (3) | 0.014 (3) | 0.012 (4) |
C11 | 0.053 (3) | 0.081 (4) | 0.053 (4) | −0.002 (3) | 0.005 (3) | 0.006 (3) |
C12 | 0.065 (4) | 0.073 (4) | 0.060 (4) | 0.006 (3) | 0.011 (3) | −0.002 (3) |
C13 | 0.093 (4) | 0.110 (5) | 0.077 (4) | 0.016 (4) | −0.015 (4) | −0.018 (4) |
C14 | 0.088 (5) | 0.116 (5) | 0.080 (4) | 0.006 (4) | −0.016 (4) | −0.012 (4) |
C15 | 0.069 (4) | 0.110 (5) | 0.075 (5) | 0.002 (4) | −0.003 (4) | 0.017 (4) |
C16 | 0.070 (4) | 0.085 (4) | 0.070 (4) | 0.015 (3) | 0.015 (3) | −0.009 (3) |
C17 | 0.099 (5) | 0.125 (6) | 0.121 (5) | 0.047 (4) | 0.014 (4) | 0.035 (5) |
C18 | 0.164 (7) | 0.154 (7) | 0.158 (7) | 0.094 (5) | 0.023 (5) | −0.004 (6) |
C19 | 0.050 (3) | 0.083 (4) | 0.052 (3) | 0.009 (3) | 0.015 (3) | 0.012 (3) |
C20 | 0.059 (3) | 0.066 (4) | 0.059 (4) | 0.009 (3) | 0.021 (3) | 0.011 (3) |
C21 | 0.073 (4) | 0.067 (4) | 0.077 (4) | 0.003 (3) | 0.020 (3) | 0.002 (3) |
C22 | 0.082 (4) | 0.067 (4) | 0.078 (4) | 0.027 (3) | 0.043 (3) | 0.021 (3) |
C23 | 0.070 (4) | 0.100 (5) | 0.072 (4) | 0.016 (4) | 0.012 (3) | 0.022 (4) |
C24 | 0.058 (4) | 0.101 (5) | 0.067 (4) | 0.004 (3) | 0.017 (3) | 0.006 (3) |
C25 | 0.095 (4) | 0.100 (4) | 0.105 (4) | 0.023 (4) | 0.027 (4) | 0.014 (4) |
C26 | 0.061 (4) | 0.164 (6) | 0.192 (7) | −0.002 (4) | 0.024 (4) | −0.054 (5) |
C27 | 0.099 (5) | 0.119 (5) | 0.103 (5) | −0.009 (5) | 0.029 (5) | −0.013 (4) |
O1—C2 | 1.347 (5) | C11—C12 | 1.381 (6) |
O1—H1 | 0.8200 | C12—C13 | 1.393 (6) |
O2—C11 | 1.353 (5) | C12—C16 | 1.444 (6) |
O2—H2 | 0.8200 | C13—C14 | 1.361 (6) |
O3—C3 | 1.364 (6) | C13—H13 | 0.9300 |
O3—C8 | 1.418 (6) | C14—C15 | 1.369 (6) |
O4—C10 | 1.364 (5) | C14—H14 | 0.9300 |
O4—C17 | 1.437 (5) | C15—H15 | 0.9300 |
N1—C7 | 1.296 (5) | C16—H16 | 0.9300 |
N1—C19 | 1.411 (5) | C17—C18 | 1.486 (7) |
N2—C16 | 1.269 (5) | C17—H17A | 0.9700 |
N2—C20 | 1.421 (5) | C17—H17B | 0.9700 |
N3—C27 | 1.105 (6) | C18—H18A | 0.9600 |
C1—C2 | 1.394 (6) | C18—H18B | 0.9600 |
C1—C6 | 1.400 (6) | C18—H18C | 0.9600 |
C1—C7 | 1.428 (6) | C19—C24 | 1.396 (6) |
C2—C3 | 1.397 (6) | C19—C20 | 1.407 (6) |
C3—C4 | 1.379 (6) | C20—C21 | 1.378 (5) |
C4—C5 | 1.377 (6) | C21—C22 | 1.388 (6) |
C4—H4 | 0.9300 | C21—H21 | 0.9300 |
C5—C6 | 1.359 (6) | C22—C23 | 1.362 (6) |
C5—H5 | 0.9300 | C22—C25 | 1.521 (6) |
C6—H6 | 0.9300 | C23—C24 | 1.375 (6) |
C7—H7 | 0.9300 | C23—H23 | 0.9300 |
C8—C9 | 1.453 (7) | C24—H24 | 0.9300 |
C8—H8A | 0.9700 | C25—H25A | 0.9600 |
C8—H8B | 0.9700 | C25—H25B | 0.9600 |
C9—H9A | 0.9600 | C25—H25C | 0.9600 |
C9—H9B | 0.9600 | C26—C27 | 1.448 (7) |
C9—H9C | 0.9600 | C26—H26A | 0.9600 |
C10—C15 | 1.375 (6) | C26—H26B | 0.9600 |
C10—C11 | 1.407 (6) | C26—H26C | 0.9600 |
C2—O1—H1 | 109.5 | C13—C14—H14 | 119.5 |
C11—O2—H2 | 109.5 | C15—C14—H14 | 119.5 |
C3—O3—C8 | 118.2 (5) | C14—C15—C10 | 120.5 (5) |
C10—O4—C17 | 116.6 (4) | C14—C15—H15 | 119.7 |
C7—N1—C19 | 119.2 (4) | C10—C15—H15 | 119.7 |
C16—N2—C20 | 122.1 (4) | N2—C16—C12 | 123.5 (5) |
C2—C1—C6 | 120.2 (5) | N2—C16—H16 | 118.3 |
C2—C1—C7 | 121.3 (5) | C12—C16—H16 | 118.3 |
C6—C1—C7 | 118.5 (6) | O4—C17—C18 | 106.7 (5) |
O1—C2—C1 | 121.8 (5) | O4—C17—H17A | 110.4 |
O1—C2—C3 | 119.1 (5) | C18—C17—H17A | 110.4 |
C1—C2—C3 | 119.1 (5) | O4—C17—H17B | 110.4 |
O3—C3—C4 | 125.5 (6) | C18—C17—H17B | 110.4 |
O3—C3—C2 | 114.6 (5) | H17A—C17—H17B | 108.6 |
C4—C3—C2 | 119.9 (6) | C17—C18—H18A | 109.5 |
C5—C4—C3 | 120.0 (6) | C17—C18—H18B | 109.5 |
C5—C4—H4 | 120.0 | H18A—C18—H18B | 109.5 |
C3—C4—H4 | 120.0 | C17—C18—H18C | 109.5 |
C6—C5—C4 | 121.5 (6) | H18A—C18—H18C | 109.5 |
C6—C5—H5 | 119.3 | H18B—C18—H18C | 109.5 |
C4—C5—H5 | 119.3 | C24—C19—C20 | 118.3 (5) |
C5—C6—C1 | 119.3 (6) | C24—C19—N1 | 121.5 (5) |
C5—C6—H6 | 120.4 | C20—C19—N1 | 120.2 (4) |
C1—C6—H6 | 120.4 | C21—C20—C19 | 119.0 (5) |
N1—C7—C1 | 123.5 (5) | C21—C20—N2 | 125.5 (5) |
N1—C7—H7 | 118.3 | C19—C20—N2 | 115.5 (5) |
C1—C7—H7 | 118.3 | C20—C21—C22 | 121.5 (5) |
O3—C8—C9 | 109.5 (6) | C20—C21—H21 | 119.2 |
O3—C8—H8A | 109.8 | C22—C21—H21 | 119.2 |
C9—C8—H8A | 109.8 | C23—C22—C21 | 119.6 (5) |
O3—C8—H8B | 109.8 | C23—C22—C25 | 120.4 (5) |
C9—C8—H8B | 109.8 | C21—C22—C25 | 119.9 (6) |
H8A—C8—H8B | 108.2 | C22—C23—C24 | 120.0 (5) |
C8—C9—H9A | 109.5 | C22—C23—H23 | 120.0 |
C8—C9—H9B | 109.5 | C24—C23—H23 | 120.0 |
H9A—C9—H9B | 109.5 | C23—C24—C19 | 121.5 (5) |
C8—C9—H9C | 109.5 | C23—C24—H24 | 119.2 |
H9A—C9—H9C | 109.5 | C19—C24—H24 | 119.2 |
H9B—C9—H9C | 109.5 | C22—C25—H25A | 109.5 |
O4—C10—C15 | 125.9 (5) | C22—C25—H25B | 109.5 |
O4—C10—C11 | 114.9 (5) | H25A—C25—H25B | 109.5 |
C15—C10—C11 | 119.2 (6) | C22—C25—H25C | 109.5 |
O2—C11—C12 | 122.8 (5) | H25A—C25—H25C | 109.5 |
O2—C11—C10 | 117.6 (5) | H25B—C25—H25C | 109.5 |
C12—C11—C10 | 119.6 (5) | C27—C26—H26A | 109.5 |
C11—C12—C13 | 119.9 (5) | C27—C26—H26B | 109.5 |
C11—C12—C16 | 120.4 (5) | H26A—C26—H26B | 109.5 |
C13—C12—C16 | 119.7 (5) | C27—C26—H26C | 109.5 |
C14—C13—C12 | 119.8 (5) | H26A—C26—H26C | 109.5 |
C14—C13—H13 | 120.1 | H26B—C26—H26C | 109.5 |
C12—C13—H13 | 120.1 | N3—C27—C26 | 179.0 (8) |
C13—C14—C15 | 121.0 (6) |
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1···N1 | 0.82 | 1.90 | 2.610 (5) | 145 |
O2—H2···N2 | 0.82 | 1.91 | 2.605 (5) | 142 |
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1···N1 | 0.82 | 1.90 | 2.610 (5) | 145 |
O2—H2···N2 | 0.82 | 1.91 | 2.605 (5) | 142 |
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During the past several decades, tetradentate Schiff-base ligands with O2N2 donor sets have been studied intensively, partially due to the interesting magnetic properties observed for their metal complexes (Zhang et al., 2009; Nayak etal.. Herein, we present the crystal structure of a new tetradentate Schiff base ligand N,N'-Bis(2-hydroxy-3-ethoxybenzylidene)-4-methyl-1,2-phenylenediamine as its acetonitrile solvate.
As shown in Figure 1, the title compound possesses a O2N2 donor set affording the potentially tetradentate ligand. The imide bond lengths 1.296 (5)Å for N1—C7 and 1.269 (5)Å for N2—C16 are slightly shorter than that of related Schiff-base ligands N,N'-Bis(2-hydroxy-3-methoxybenzylidene)-1,2- phenylenediamine (Liu, et al., 2006) and 6,6'-Diethoxy-2,2'- [4,5-dimethyl-o-phenylenebis(nitrilomethylidyne)]diphenol (Kargar, et al. 2009). In this compound, two relative strong O-H···N intramolecular bonds, O1-H1···N1 and O2-H2···N2 are observed (Table 1).