H. Mohd Ali

(E)-4-Hydr-oxy-N'-(2-hydr-oxy-4-methoxy-benzyl-idene)benzohydrazide N,N-dimethyl-formamide solvate.

The Schiff base molecule of the title compound, C15H14N2O4·C3H7NO, adopts a trans configuration with respect to the C=N double bond; the Schiff base itself is nearly planar (r.m.s. deviation 0.20 Å). The amido N atom is a hydrogen-bond donor to the dimethylformamide solvate molecule. One of the hydroxy groups forms an intramolecular hydrogen bond to the N atom of the C=N double bond, whereas the other forms an intermolecular hydrogen bond to the carbonyl group.

3,4,5-Trihydr­oxy-N′-(1H-indol-2-ylmethyl­idene)benzohydrazide–1H-indole-2-carbaldehyde azine–methanol (2/1/2)

The title compound, 2C16H13N3O4·C18H14N4·2CH4O, was crystallized from the reaction between 3,4,5-trihydroxybenzoylhydrazine and indole-2-carbaldehyde in a mixture of ethanol and methanol. The compound is a stoichiometric 2:1 cocrystal of the methanol-solvated reaction product, 3,4,5-trihydroxy-N′-(1H-indol-2-ylmethylidene)benzohydrazide and 1H-indole-2-carbaldehyde azine that arose unexpectedly during the synthesis. The former molecules are linked by O—H⋯O hydrogen bonds and also by π–π stacking interactions between benzoylhydrazide rings into a two-dimensional network. The methanol solvent molecules are hydrogen bonded to this network. The centrosymmetric azine molecules are not engaged in hydrogen bonding.

(1R,2R)-N,N'-Bis[1-(2-pyrid-yl)ethyl-idene]cyclo-hexane-1,2-diamine.

In the title compound, C20H24N4, the cyclohexane ring adopts a chair conformation with the two imine groups linked at equatorial positions. The two halves of the molecule are related by a crystallographic twofold rotation axis. The dihedral angle between the pyridine rings is 75.73 (3)°.

Dibut­yl{N′-[1-(5-chloro-2-oxidophenyl-κO)ethyl­idene]-3-hy­droxy-2-naphtho­hydrazidato-κ2N′,O2}tin(IV)

The five-coordinate SnIV atoms in the two crystallographically independent molecules of the title compound, [Sn(C4H9)2(C19H13ClN2O3)], are in distorted cis-C2NO2Sn trigonal-bipyramidal coordination environments. The tridentate dianion of the Schiff base, N′-[1-(5-chloro-2-oxidophenyl)ethylidene]-3-hydroxy-2-naphthohydrazide, displays intermolecular O—H⋯N hydrogen bonding, which stabilizes the overall compound.

catena-Poly[[triphenyl­tin(IV)]-μ-2-[(3,5-di-tert-butyl-4-hydroxy­benz­yl)sulfan­yl]acetato-κ2O:O′]

The title compound, [Sn(C6H5)3(C17H25O3S)]n, comprises two symmetry-independent five-coordinated triphenyltin molecules which are linked by carboxylate bridges into a polymeric chain. The SnIV atom is in a distorted trans-C3SnO2 trigonal-bipyramidal geometry. The presence of two bulky tert-butyl groups on the benzene ring prevents any hydrogen-bonding interactions involving the hydroxyl substituents.

[N′-(4-Meth­oxy-2-oxidobenzyl­idene)4-nitro­benzohydrazidato-κ3O,N,O′](pyridine-κN)copper(II)

The pyridine-coordinated CuII atom in the title Schiff base complex, [Cu(C15H11N3O5)(C5H5N)], is O,N,O′-chelated by the doubly deprotonated Schiff base ligand. The metal centre is in a square-planar coordination geometry.

A second monoclinic polymorph of 2-(diformyl-methyl-idene)-3,3-dimethyl-2,3-dihydro-1H-indole.

The crystal structure of the title compound, C13H13NO2, is a polymorph of the structure first reported by Helliwell et al. [Acta Cryst. (2006), E62, o737-o738]. It is also monoclinic (space group P21/c), but with completely different cell constants. The molecular conformations of these polymorphs differ by a 180° rotation of one formyl group. The present molecule is planar [maximum deviation 0.089 (2) Å] with the exception of the two methyl groups which lie on either side of the plane. There are strong intra- and intermolecular N—H⋯O hydrogen bonds. The latter link pairs of molecules across crystallographic centers of symmetry. Two aldehyde O atoms are brought close together [2.896 (4) Å in this arrangement but are not hydrogen bonded. In the earlier polymorph, one formyl group is rotated by 180° to yield intermolecular hydrogen bonding and an infinite polymeric chain. The other formyl group is involved in the same intramolecular hydrogen bonding as has been found here.

Tetra-μ2-acetato-bis­{μ2-5-meth­oxy-2-[(2-morpholinoeth­yl)iminio­meth­yl]phenolato}tricadmium(II)

The central CdII atom in the trinuclear title compound, [Cd3(C14H19N2O3)2(CH3COO)4], lies on a center of inversion and is bonded to the O atoms of four acetate groups as well as to the phenolate O atoms of the mono-deprotonated Schiff base ligands in a distorted all-trans octahedral geometry. Two of the acetate groups function in a μ2-bridging mode, while the other two each chelate to the terminal CdII atom and simultaneously bind to the central metal atom in a κ3-bonding mode. The Schiff base anions N,O-chelate to the terminal metal atoms. The morpholine ring assumes a chair conformation.

Bis{5-methoxy-2-[(2-morpholinoethyl)iminomethyl-κN]phenolato-κO1}nickel(II)

The asymmetric unit of the crystal structure of the title compound, [Ni(C14H19N2O3)2], contains two independent NiII complex molecules, with the metal atoms each located on a center of inversion. Each metal atom is chelated by two Schiff base anions in a distorted square-planar coordination environment.

Dichlorido{N,N-dimethyl-N′-[1-(2-pyrid­yl)ethyl­idene]ethane-1,2-diamine-κ3N,N′,N′′}zinc

The asymmetric unit of the title compound, [ZnCl2(C11H17N3)], contains two independent pentacoordinate ZnII complex molecules. In each molecule, the metal atom is coordinated by an N,N′,N′′-tridenate Schiff base and two Cl atoms in a distorted square-pyramidal geometry. The two molecules differ little in their geometry, but more in their intermolecular interactions. In the crystal, adjacent molecules are connected via C—H⋯Cl interactions into a three-dimensional supramolecular structure. The network is supplemented by π–π interactions formed between the aromatic rings of pairs of the symmetry-related molecules [centroid–centroid distances = 3.6255 (10) and 3.7073 (10) Å]. The crystal lattice contains void spaces with a size of 52 Å3.