Unprecedented formation of selenido-bridged tri-nuclear palladium(II) and platinum(II) complexes, [M3(μ3-Se)2(P∩P)3]2+, via C–Se bond cleavage

Reaction of [M(SeCOC6H4Me-4)2(P∩P)] with MCl2(P∩P) in the presence of NaBPh4 in dichloromethane–methanol mixture afforded selenido-bridged tri-nuclear complexes [M3(μ3-Se)2(P∩P)3][BPh4]2 (M3 = Pd3, Pt3, Pd2Pt, PdPt2; P∩P = dppm, dppe, dppp, (PnPr3)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 [Pd3(μ3-Se)2(dppe)3][BPh4]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.

Graphical abstractTrinuclear selenido-bridged complexes, [M3(μ3-Se)2(P∩P)3][BPh4]2 are formed in good yields via unprecedented cleavage of C–Se linkage of selenocarboxylate in a reaction of [M(SeCOC6H4Me-4)2(P∩P)] with MCl2(P∩P) in the presence of NaBPh4.Figure optionsDownload full-size imageDownload as PowerPoint slide