Sulfur K-Edge X-Ray Absorption Spectra for Dimethyl Sulfoxide in the Solvated Thallium(III), Indium(III), Gallium(III) and Aluminum(III) Ions

The sulfur K-edge X-ray absorption near edge spectra (XANES) of the hexakis(dimethyl sulfoxide) solvated trivalent group 13 ions, Al, Ga, In and Tl, in the solid state show larger splitting and different intensity distribution of the main sulfur 1s electronic excitations than for the uncoordinated dimethyl sulfoxide molecule. The transitions have been interpreted by density functional calculations, and the increased splitting is shown to be an effect of metal-oxygen orbital interactions in the bonds to the oxygen coordinated dimethyl sulfoxide ligand.