Synthesis, spectral, thermal and electrochemical studies of nickel (II) complexes with N2O2 donor ligands

The free Schiff base ligands H2MABCE, H2MABCP, and H2MABCT and their complexes [Ni(MABCE)], [Ni(MABCP)], and [Ni(MABCT)] have been synthesized and characterized by spectroscopic and cyclic voltammetric studies. The coordination geometry around the nickel atom is a square planar with N2O2 donor atoms. Cyclic voltammetric studies of the complexes show one electron quasi-reversible waves corresponding to Ni(II)/Ni(I) and Ni(II)/Ni(III) processes. The electronic spectra of the complexes reveal a four coordinate geometry. The crystal structure of one of the ligands (H2MABCE) has also been reported.