Synthesis, characterization and spectroscopic studies of mixed-ligand Cu(II) complexes with 2,6-pyridinedicarboxylic acid and L-glutamic, succinic, malonic acids and glutamine

Abstract

Mixed-ligand coordination complexes of copper(II) (1-4) were synthesized by solvothermal method in 1:1:1 molar ratio [metal: 2,6-pdc: amino acid = L-glutamic acid (L-glu), glutamine (gln), succinic acid (SA) and malonic acid (MA)], using 2,6-pyridinedicarboxylic acid (2,6-pdc) and amino acids as primary and secondary ligands respectively. These complexes are formulated as: 1. [Cu3(2,6-Hpdc)2(2,6-pdc) (L-glu)(H2O)5] 2. [Cu3(2,6-pdc)2(2,6-Hpdc)(gln)(H2O)5] 3. [Cu3(2,6-Hpdc)2(2,6-pdc)(SA)(H2O)6] and 4. [Cu3(2,6-Hpdc)2(2,6-pdc)(MA)(H2O)7]. All these complexes (1-4) have been characterized by elemental, FT-IR and mass spectroscopy. Mass spectroscopic data showed that the complexes (1-4) were trinuclear and chelating. The FT-IR and UV-visible spectroscopy, data confirmed the proposed octahedral geometry of the complexes.