Complexes of lanthanide methanesulphonates with thioxane oxide: Comparison with tetramethylene sulphoxide

Abstract

Rare earth methanesulphonates (ms) react with thioxane oxide (tso) to give compounds with the composition Ln(ms) 3·3tso (Ln  La-Lu, Y). These compounds were isolated and their properties were studied. The molar conductance measurements are compatible with non-electrolytic behaviour. The vibrational spectra in the IR region indicate that tso coordination occurs through the sulphoxide group and that the ms ions are coordinated. X-ray powder patterns differentiate three types of isomorphous compounds: lanthanum to gadolinium; terbium and dysprosium; holmium to lutetium and yttrium. The visible absorption spectrum of the solid neodymium compound suggests that the 4f orbitals are weakly involved in bonding and that the Nd 3+ ion is not in a cubic site. The fluorescence spectrum of Eu(ms) 3·3tso is tentatively interpreted.