Synthesis and Characterization of Complexes of Copper(II), Nickel(II), Cobalt(II) and Zinc(II) with Alanine and Uracil or 2-Thiouracil

Abstract

Abstract Mixed ligand complexes of Cu(II), Ni(II), Co(II) and Zn(II) formed with alanine and uracil or 2-thiouracil have been synthesized and characterized by elemental analyses, conductance, spectra (IR and electronic) and magnetochemical measurements. The results show that alanine is bidentate in all cases coordinating through-NH2 and COO− groups. Uracil behaves as a bidentate ligand in the Cu(II) complex, coordinating through one carbonyl oxygen and nitrogen, whereas in other cases it is only monodentate, coordinating through nitrogen. With thiouracil, coordination occurs from carbonyl oxygen and one nitrogen in the Cu(II) and Ni(II) complexes, but in the Co(II) complex coordination occurs from thionyl sulphur and nitrogen. In the Zn(II) complex it shows tridentate behaviour, coordinating through oxygen, sulphur and nitrogen. Mixed Cu(II), Co(II) and Zn(II) complexes of uracil and the Ni(II) and Zn(II) complexes with thiouracil are octahedral, whereas the mixed Ni(II) complex with uracil shows distorte...