Synthesis and spectrothermal studies on group 12 metals coordination with novel carboxyamide ligands

Complexes of group 12 metals with new ligands N′,N″-bis(3-carboxy-1-oxopropanyl) 2-amino-N-arylbenzamidine (H2L) and N′,N″-bis(3-carboxy-1-oxophenelenyl) 2-amino-N-arylbenzamidine (H2L) have been synthesized and characterized by elemental analyses, vibrational spectra, electronic spectra, 1H NMR spectra, TOF-mass spectra, thermal studies and molecular modeling studies. The infrared and 1H NMR spectral data are in agreement with coordination of amide and carboxylate oxygen of the ligands giving a MO4 tetrahedral chromophore. The elemental analyses and mass spectral data have justified the ML complexes. The thermal behaviour of complexes shows that water molecule is removed in first step-followed by decomposition of the rest of the molecule in the next steps. Kinetic and thermodynamic parameters were computed from the thermal data using Coats and Redfern method, which confirm first order kinetics. Molecular structures of the complexes have been optimized by MM2 calculations and supported tetrahedral geometry around metal(II) ions.