Studies in six-co-ordination of the lanthanides with bidentate ligands. The crystal and molecular structures of tris(dicyclohexyldithiophosphinato)dysprosium(III) and tris(dicyclohexyldithiophosphinato)lutecium(III)

Abstract

The crystal structures of [Dy{P(C6H11)2S2}3] and [Lu{P(C6H11)2S2}3] have been determined from diffractometer data. The co-ordination polyhedra are intermediate between trigonal prismatic and octahedral, the smaller Lu ion having the more octahedral environment. The structures are significantly different from those expected from calculated ligand–ligand repulsions. The origin of this distortion is discussed and compared with that found in analogous praseodymium and samarium compounds. [Dy{P(C6H11)2S2}3] crystallizes in the triclinic space group P, with a= 9.661(2), b= 11.449(2), c= 20.553(3)A, α= 85.88(1), β= 77.32(1), and γ= 84.76(1)°. The R value was 0.042. [Lu{P(C6H11)2S2}3] also crystallizes in the triclinic space group P, with a= 9.659(2), b= 11.399(1), c= 20.532(3)A, α= 85.89(1), β= 77.09(1), and γ= 84.80(1)°. The R value was 0.039.