Platinum(II) and palladium(II) complexes of chiral P-Cl functionalized bis-phosphino ortho-carbaboranes.

Platinum(II) and palladium(II) complexes of chiral P-Cl functionalized bis-phosphino ortho-carbaborane are readily obtained from reactions of chiral bidentate phosphino carbaborane ligands rac-1,2-(PRCl)(2)(C(2)B(10)H(10)) with [MCl(2)(COD)] (M = Pd, Pt; COD = 1,5-cyclooctadiene) to give cis-rac-[MCl(2){1,2-(PRCl)(2)(C(2)B(10)H(10))}] (M = Pt, Pd; R = (t)Bu, Ph, NEt(2), NPh(2)). cis-rac-[MCl(2){1,2-(P(t)BuCl)(2)(C(2)B(10)H(10))}] [M = Pt (1), Pd (6)] decompose in solution in toluene or dichloromethane at room temperature over several weeks with formation of the corresponding dinuclear platinum and palladium complex with two nido-carbaboranyl phosphine ligands, (R(P),R(P),S(P),S(P))-[{M(7,8-{P(t)BuCl}(2)C(2)B(9)H(10))(mu-Cl)}(2)] [M = Pt (2), Pd (7)], among other decomposition products.