Date Published: May 01, 2010
Publisher: International Union of Crystallography
Author(s): Long-Wei Lei, Yin-Zhi Jiang, Yang Zou.
The ligand N-(2-hydroxy-3-methoxybenzylidene)glycylglycine (H3L), a Schiff base derived from glycylglycine and 3-methoxysalicylaldehyde, was used in the synthesis of a new organic–inorganic coordination complex, [Mn(H2O)6][Cu(C12H11N2O5)]2·6H2O. The MnII atom is located on an inversion center and is coordinated to six water molecules in a slightly distorted octahedral geometry. The CuII atom is chelated by the tetradentate Schiff base ligand in a distorted CuN2O2 square-planar coordination. In the crystal structure, the complex [Mn(H2O)6]2+ cations and the [CuL]− anions are arranged in columns parallel to the a axis and are held together by O—H⋯O hydrogen bonding. Additional hydrogen bonds of the same type further link the columns into a three-dimensional network.
Transition metal complexes of salicylaldehyde–peptide- and salicylaldehyde–amino-acid-derived Schiff bases are suitable non-enzymatic models for pyridoxal amino acid systems, which are of considerable importance as key intermediates in metabolic reactions, see: Bkouche-Waksman et al. (1988 ▶); Wetmore et al. (2001 ▶); Zabinski & Toney (2001 ▶). For the preparation, structural characterization, spectroscopic and magnetic studies of Schiff base complexes derived from salicylaldehyde and amino acids, see: Ganguly et al. (2008 ▶) and references cited therein. For Schiff bases derived from simple peptides, see: Zou et al. (2003 ▶).