Isomerism in bis(phenylselenolato)bis(triphenylphosphine)platinum(II): the crystal and molecular structures of cis- and trans-[Pt(SePh)2(PPh3)2]

The reaction of cis-[PtCl2(PPh3)2] and NaSePh in benzene produces a mixture of cis- and trans-isomers of the monomeric platinum complex [Pt(SePh)2(PPh3)2]. The low-temperature X-ray structures of both isomers are reported. The structure of cis-[Pt(SePh)2(PPh3)2] is the first crystallographic characterized cis-isomer of mononuclear platinum(II) complex containing only non-chelating organoselenolato and phosphine ligands.