Selenito-complexes: mixed ligand complexes of nickel [II] and cobalt [III]

Four selenito amine and/or ammine complexes of Co [III] and one selenito amine complexes of Ni [II] were prepared [Co[NH3]3 SeO3] NO3, [Co[NH3]4 SeO3] NO3, [Co[en]2 SeO3] ClO4.H2O, [Co[en]2 [NH3] [SeO3]1/2] Br2.H2O and [Ni[en]2 SeO3].4H2O. Visible spectra of the complexes showed that they are hexacoordinated. The magnetic moment of the Ni [II] complex is in accord with its octahedral symmetry, and the visible spectra of the Co [III] complexes are consistent with their being low-spin. IR stretching vibrations of the selenite group in the deuterated complexes did not differentiate clearly between types of the SeO3 linkage in these complexes. The solubility of the complexes in water suggests that they are ionic and not polymeric