Syntheses of selenolato-bridged dinuclear hydridoplatinum complexes [Pt2H2(mu-Se(t)Bu)2(PPh3)2] and [Pt2H(Se(t)Bu)(mu-Se(t)Bu)2(PPh3)2]: unusual thermal reaction of hydrido(1,1-dimethylethaneselenolato) platinum complex cis-[PtH(Se(t)Bu)(PPh3)2].

Novel selenolato-bridged dinuclear hydridoplatinum complexes, cis-[Pt(2)H(2)(mu-Se(t)Bu)(2)(PPh(3))(2)] (2) and cis-[Pt(2)H(Se(t)Bu)(mu-Se(t)Bu)(2)(PPh(3))(2)] (3) were synthesized in 30% and 57% yields, respectively, by the thermolysis of hydrido(1,1-dimethylethaneselenolato) Pt(II) complex cis-[PtH(Se(t)Bu)(PPh(3))(2)] (1) in toluene at 80 degrees C for 3 h. The structures of dinuclear complexes 2 and 3 were fully characterized on the basis of their NMR and IR spectroscopic data and X-ray crystallography. The two distorted square planar Pt atoms in 2 and 3 are held together by two bridged selenolato ligands, (t)Bu groups of which adopt a trans configuration with respect to the four-membered Pt(2)Se(2) ring. Each central Pt(2)Se(2) ring in 2 and 3 has a hinged arrangement due to the steric repulsion among the two PPh(3) ligands and the (t)Bu group lying between them.