Coordinating Properties of Chlorosulphate Ion; Synthesis and Characterization of Mn (II), Co (II), Ni(II) and Cu(II) Bis-(Chlorosulphates) and Their Complexes with Nitrogen-Containing Bases

Abstract

Chlorosulphates of the divalent transition metals Mn(II), Co(II), Ni(II) and CU(II) have been prepared and characterized. The electrical conductivities and i.r. spectral data indicate a considerable extent of cation-anion interaction and the anion is bonded in a tridentate manner such that it has a reduced Cs symmetry in the molecule. The magnetic susceptibility measurements and the ligand field spectroscopic studies are consistent with the octahedral geometry for these salts and indicate the presence of some covalent bonding between the chlorosulphate ion and the metal ion. However, a tetragonal distortion in the geometry has been indicated for the Ni(II) salt.

The coordination compounds of the type ML₄(SO₃Cl)₂[L=acetonitrile, pyridine, pyridine N-oxide] and ML₂(SO₃Cl)₂ [L = 2,2′bipyridine, acridine] have also been prepared and characterized. The i.r. and ligand field spectroscopic studies and magnetic susceptibility measurements indicate the presence of a strong interaction between the anion and the complex cations. In all the complexes the hexacoordination of the metal ion is maintained and the chlorosulphate ion is coordinated in an unidentate manner with the exception of the acridine complexes where the anion acts as a bidentate ligand.