Preparation and characterisation of dithiophosphinato-complexes of yttrium and the lanthanoids

Abstract

Hydrated lanthanoid(III) chlorides react with salts of dithiophosphinic acids in hot ethanolic solution to form the corresponding neutral tris or anionic tetrakis complexes, [Ln(S₂PR₂)₃](R = C₆H₁₁) and [Ln(S₂PR₂)₄]^–(R = Me, OEt, or C₆H₁₁) respectively. The product of the reaction is sterically controlled. Displacement reactions with PPh₃O to give mixed complexes are described. The characterisation, structures, and spectral properties of all the isolated complexes are discussed. The lanthanoid-sulphur bond is compared with transition-metal-sulphur bonds