Synthesis and crystal structure of four Pd(II) complexes containing nido or closo carborane diphosphine ligands

Three Pd(II) complexes [Pd2(μ-Cl)2{7,8-(PPh2)2-7,8-C2B9H10}2] · 0.25CH2Cl2 (1), [Pd{7,8-(PPh2)2-7,8-C2B9H10}2] · 4CHCl3 (2) and [PdCl2(1,2-(PPh2)2-1,2-C2B10H10)] (3) have been synthesized by the reactions of 1,2-(PPh2)2-1,2-C2B10H10 with PdCl2 in acetonitrile, cyanophenyl and dichloromethane, respectively. A fourth complex [PdI2(1,2-(PPh2)2-1,2-C2B10H10)] (4) was obtained by a ligand exchange reaction through substitution of Cl− of complex 3 with I−. All the four complexes have been characterized by elemental analysis, FT-IR, 1H and 13C NMR spectroscopy and X-ray structure determination.