Syntheses, Crystal Structures, and Magnetic Properties of Carboxylate-Bridged Copper(II) Complexes with Bis(2-Pyridylmethyl)Amino Acids

Abstract

Tetradentate Schiff-base carboxylate-containing ligands, bis(2-pyridylmethyl)amino-5-valeric acid (Hpmva) and bis(2-pyridylmethyl)amino-6-caproic acid (Hpmca), react with copper(II) perchlorate to give rise to the carboxylated bridged chain complexes. These complexes have been characterized by X-ray crystallography, spectroscopic, and variable-temperature magnetic susceptibility measurements. In 1 and 2, each of the copper(II) ions exhibit CuN 3 O 2 coordination environments with the three nitrogen atoms of the ligand and one oxygen atom belonging to the carboxylate group of an adjacent molecule occupying the basal position and a water molecule coordinated in the axial position. The electronic spectra of the complexes are significantly affected by the coordination geometry. Magnetic susceptibility measurements indicate that complexes exhibit very weak ferromagnetic interactions.

Interplay of thermochemistry and Structural Chemistry, the journal (volume 16, 2005) and the discipline

“…A study on copper(II) complexes is reported in the article by Choi et al [187] in which self-assembling compounds were synthesized with tetradentate Schiff-base carboxylate-containing ligands, bis(2-pyridylmethyl)amino acids. The synthesized compounds were characterized and the X-ray crystal structures determined.…”