Synthesis, spectral characterization and crystal structure of copper(II) complexes of 2-hydroxyacetophenone-N(4)-phenyl semicarbazone

• DOI: 10.1016/j.poly.2006.11.035
• Publication Date: 2006-11-30T09:44:54Z
• Authors: U.L. Kala; S. Suma; M.R. Prathapachan...; Suja Krishnan; Rohith P. John
• Keywords: Semicarbazone; Monoclinic crystal system; Unpaired electron

Abstract Six new copper(II) complexes of 2-hydroxyacetophenone-N(4)-phenyl semicarbazone have been synthesized and physico-chemically characterized. The tridentate character of the semicarbazone is inferred from IR spectra. Based on EPR studies, the spin Hamiltonian and bonding parameters have been calculated. The g values, calculated for all the complexes in frozen DMF, indicate the presence of the unpaired electron in the d x 2 - y 2 orbital. The metal–ligand bonding parameters evaluated showed strong in-plane σ and in-plane π-bonding. The structure of the compound, CuLphen has been resolved using single crystal X-ray diffraction studies. The crystal structure revealed a monoclinic lattice with space group symmetry P21/c. The compound adopts a distorted square pyramidal geometry with a N2O2 core as the base.