Coordination compounds of manganese(II) with Tetrahydro-1,4-thiazin-3-one and Thiazolidine-2-thione

Abstract

Synthetic and characterization studies of manganese(11) complexes with tetrahydro-l,4-thiazin-3-one (tht) and thiazolidine-2-thione (ttz) are reported. The methods used for the characterization of the compounds include elementary analyses, molar conductances, magnetic moments and electronic and infrared spectroscopy. Assignments for the metal-ligand modes have also been made; the tht derivatives are coordinated through the oxygen atom, while the ttz derivatives are nitrogen-bonded in all the complexes. By use of infrared spectroscopy it has been possible distinguish whether or not the polyanions present in these derivatives are coordinated to the metal ion or are present as free ions.The wavelengths of the principal absorption peaks have been accounted for quantitatively in terms of the crystal field theory. The values of B and C obtained are significantly lower than the corresponding value for the free gaseous ion.