Metal complexes of pyrimidine-derived ligands—III: Tris-complexes of Co(III), Ni(II) and Cu(II) fluoroborates, perchlorates and iodides with 3,5-dimethyl-1-(4′,6′-dimethyl-2′-pyrimidyl) pyrazole, a potential anti-tumour agent

Abstract

Tris-complex of Co(II), Ni(II), Cu(II) fluoroborates, perchlorates and iodides with the title ligand conform to the composition M(DPymPz) 3X 2, nH 2O [M = Co(II), Ni(II), Cu(II); X = ClO 4, BF 4 and I, n = 0,2]. Physico-chemical characterisations of the complex species have been made from electronic and vibrational spectra, magnetic susceptibility measurements in the solid state and conductivity measurements in solution. Electronic spectral features together with the corresponding ligand field parameters suggest an overall octahedral environment for the pyrazolyl nitrogen (tertiary) and one of the pyrimidyl nitrogens as bonding sites in forming these complexes while the anion (X) retains its identity (as in free form) in the said species.