Structural consequences of ligand and metal substitution in metallacarbaboranes; the crystal and molecular structures of 3-[C2H4(NMe2)2]3,1,2-PdC2B9H11 and 3,3-(PMe3)2-3,1,2-PdC2B9H11

Abstract

The molecular structures of 3-[C₂H₄(NMe₂)₂]-3,1,2-PdC₂B₉H₁₁ and 3,3-(PMe₃)₂-3,1,2-PdC₂B₉H₁₁, determined by single-crystal X-ray diffraction, reveal a marked structural influence of the ligands trans to the C₂B₉H₁₁ cage, in that the amino-compound adopts a ‘slipped’ configuration, whereas when (PMe₃)₂ replaces C₂H₄(NMe₂)₂ much more symmetrical metal-cage binding is observed; the phosphine compound also shows unexpected differences from the known and similar platinum derivative 3,3-(PEt₃)₂-3,1,2-PtC₂B₉H₁₁.