Unprecedented formation of selenido-bridged tri-nuclear palladium(II) and platinum(II) complexes, [M 3(μ 3-Se) 2(P ∩P) 3] 2+, via C–Se bond cleavage

Abstract

Reaction of [M(SeCOC 6H 4Me-4) 2(P ∩P)] with MCl 2(P ∩P) in the presence of NaBPh 4 in dichloromethane–methanol mixture afforded selenido-bridged tri-nuclear complexes [M 3(μ 3-Se) 2(P ∩P) 3][BPh 4] 2 (M 3 = Pd 3, Pt 3, Pd 2Pt, PdPt 2; P ∩P = dppm, dppe, dppp, (P n Pr 3) 2) formed via unprecedented cleavage of C–Se linkage of selenocarboxylate. These complexes were characterized by UV–Vis and NMR ( 1H, 31P, 77Se, 195Pt) spectroscopy. The structure of [Pd 3(μ 3-Se) 2(dppe) 3][BPh 4] 2 was established by X-ray crystallography. The geometry around each palladium atom is approximately square planar with two P atoms from the chelating dppe and two Se atoms defining the coordination sphere.