Cong-Shan Zhou

Synthesis and X-Ray Crystal Structures of Two New Zinc(II) Complexes with Schiff Bases

Two Schiff base compounds, 2-[(3-dimethylaminopropylimino)methyl]phenol (L1) and 2-bromo-4-chloro-6-[(3-methylaminopropylimino)methyl]phenol (L2), react with zinc bromide in methanol solutions, respectively, to give two mononuclear complexes, [ZnBr2L1] (1) and [ZnBr2L2]· 0.5H2O (2). Both complexes were characterized by physico-chemical and spectroscopic methods. X-ray crystallography indicates that the Zn atom in each complex is in a tetrahedral coordination.

2-Chloro-N′-(5-hydr­oxy-2-nitro­benzyl­idene)benzohydrazide

The molecule of the title Schiff base compound, C14H10ClN3O4, exists in a trans configuration with respect to the acyclic C=N bond. The dihedral angle between the two benzene rings is 62.37 (9)°. An intramolecular C—H⋯O hydrogen bond is observed. In the crystal structure, adjacent molecules are linked into a ribbon along [10] by O—H⋯O and N—H⋯O hydrogen bonds.

Synthesis and Crystal Structure of a Dibridged Dinuclear Cadmium(II) Complex with Schiff Base 2-[(2-Dimethylaminoethylimino)methyl]-6-methoxyphenol

A tetradentate Schiff base compound 2-[(2-dimethylaminoethylimino)methyl]-6-methoxyphenol (HL) reacts with cadmium nitrate and ammonium thiocyanate in a methanol solution to give a dinuclear complex [Cd2L2(μ1,1-NCS)(NCS)(OH2)]. The complex was characterized by physico-chemical and spectroscopic methods. X-ray crystallography indicates that each Cd(II) atom is in a distorted octahedral coordination. The two metal atoms are bridged by one phenolate O and one end-on thiocyanate groups, with the distance of 3.399(3) Å.

2-Chloro-N′-(4-nitro­benzyl­idene)benzo­hydrazide

The title Schiff base compound, C14H10ClN3O3, exists in a trans configuration with respect to the C=N bond. The dihedral angle between the two benzene rings is 15.9 (2)°. In the crystal, the molecules are linked into chains along [101] by intermolecular N—H⋯O hydrogen bonds.

N'-(5-Bromo-2-hydroxy-benzyl-idene)-4-chloro-benzohydrazide.

The title Schiff base, C14H10BrClN2O2, exists in a trans configuration with respect to the C=N bond and the dihedral angle between the two benzene rings is 0.8 (2)°. There is an intramolecular O—H⋯N hydrogen bond in the molecule, which generates an S(6) loop. In the crystal, intermolecular N—H⋯O hydrogen bonds link adjacent molecules into extended chains propagating along the c-axis direction.

2-Chloro-N′-(2,4-dichloro­benzyl­idene)benzohydrazide

The title Schiff base compound, C14H9Cl3N2O, exists in a trans configuration with respect to the C=N bond and the dihedral angle between the two benzene rings is 13.5 (2)°. In the crystal, intermolecular N—H⋯O hydrogen bonds link adjacent molecules into extended C(4) chains propagating along the c-axis direction.