Synthesis and characterization of the complexes of chromium(III), manganese(ll), iron(III), cobalt(ll), nickel(ll) and copper(ll) with 5-( 2-hydroxybenzylidene)aminobenzopyrazole

Abstract

Complexes of Cr(III), Mn(II), Fe(III), Co(II), Ni(II) and Cu(II) with 5-(2-hyroxybenzylidene)aminobenzopyrazole (HBAB) have been prepared and characterized. The IR spectral studies indicate that the ligand act as a bidentate donor and coordinates through the nitrogen of the azomethine group and deprotonated OH group. The complexes [M(HBAB)₃] (M=Cr, Fe) and [M(HBAB)₂-2H₂O](M=Mn, Co, and Ni) have been assigned an octahedral geometry whereas Cu(HBAB)₂ is proposed to be square-planar. The ligand field parameters, 10Dq and B have also been calculated.