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

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 dx2-y2dx2-y2 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.

Graphical abstractCopper(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. The g   values, calculated for all the complexes in frozen solution EPR, indicate the presence of the unpaired electron in the dx2-y2dx2-y2 orbital. The metal–ligand bonding parameters evaluated showed strong in-plane σ and in-plane π-bonding. The crystal structure of CuLphen 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.Figure optionsDownload full-size imageDownload as PowerPoint slide