Feng-Wu Wang

3-Bromo-N'-(3,5-dibromo-2-hydroxy-benzyl-idene)benzohydrazide methanol solvate.

The title compound, C14H9Br3N2O2·CH4O, was prepared by the reaction of 3,5-dibromo-2-hydroxybenzaldehyde and 3-bromobenzohydrazide in methanol. The asymmetric unit of the crystal consists of a Schiff base molecule and a methanol molecule of crystallization. The dihedral angle between the two benzene rings is 5.5 (2)°. An intramolecular O—H⋯N hydrogen bond is observed. In the crystal structure, pairs of adjacent Schiff base molecules are linked by two methanol molecules through intermolecular N—H⋯O and O—H⋯O hydrogen bonds.

Dibromido{2-[2-(piperidinium-1-yl)ethyl­imino­meth­yl]phenolato}zinc(II) monohydrate

The asymmetric unit of the title compound, [ZnBr2(C14H20N2O)]·H2O, consists of a mononuclear Schiff base zinc(II) complex molecule and a solvent water molecule. The ZnII atom is four-coordinated in an approximately tetrahedral geometry, binding to the imine N and phenolate O atoms of the neutral zwitterionic Schiff base ligand and to two terminal Br− anions. In the crystal structure, molecules are linked through intermolecular O—H⋯Br and O—H⋯O hydrogen bonds, forming chains running along the b axis.

Synthesis and Crystal Structures of Two Silver(I) Complexes Derived from 2-Amino-4-methylpyridine with 2-Aminobenzoic Acid and Nicotinic Acid

The reaction of Ag2O and 2-amino-4-methylpyridine (AMP) with 2-aminobenzoic acid (HAC) and nicotinic acid (HNA), respectively, afforded two silver(I) complexes, [Ag(AMP)2] ·AC (1) and [Ag(AMP)(NA)]n·nH2O (2). Both complexes were characterized by elemental analyses and X-ray single-crystal diffraction. Complex (1) is a mononuclear silver(I) complex, in which the Ag atom is in a linear geometry, while complex (2) is a pyridine-3-carboxylate bridged polynuclear silver(I) complex, in which the Ag atom is in a distorted triangular geometry. Both crystals are stabilized by intermolecular hydrogen bonds.

Anion‐Controlled Synthesis, Characterization, and Crystal Structures of a Pair of Schiff Base Cobalt Complexes

A pair of new mononuclear Schiff base cobalt complexes, [CoIIIL2] · ClO4 (1) and [CoIIL2] · CH3OH (2) (L=4‐chloro‐2‐[(2‐ethylaminoethylimino)methyl]phenol), have been synthesized from the same Schiff base ligand and synthetic procedures, but with different cobalt salts. The complexes were characterized by elemental analysis, IR spectra and single crystal X‐ray diffraction. Each of the complexes consists of a [CoL2] complex moiety. The main difference between the two structures is the second moiety, viz. perchlorate anion for (1) and methanol molecule for (2). The Co atom in each of the complexes is six‐coordinated by two Schiff base ligands, forming an octahedral coordination. The same Schiff base ligand used in the preparation of the complexes with different cobalt salts can result in different structures of the final products.

Azido­{1‐[2‐(dimethyl­amino)­ethyl­iminometh­yl]naphthalenolato}copper(II)

In the title mononuclear copper(II) complex, [Cu(C15H17N2O)N3], the CuII ion is four-coordinate in a square-planar geometry defined by the imine and amine N atoms, the naphthalenolate O atom of the Schiff base and a terminal N atom of the azide anion.

Azido­{1-[2-(dimethyl­amino)­ethyl­iminometh­yl]naphthalenolato}copper(II). Erratum

Erratum to Acta Cryst. (2006), E62, m983–m985.