Isocyanide, carbene, diethyldithiocarbamate, and cyclo-octa-1,5-diene complexes of platinum(II)

Abstract

Several complexes of the type [Pt(CH₃)(π-1,5-C₈H₁₂)L](PF₆)(L = one of a variety of neutral ligands) have been prepared. The coupling constant J(Pt–CH) to the vinyl protons trans to L is dependent upon the nature of L and this coupling constant is apparently insensitive to platinum–olefin π-back bonding. The cyclo-octa-1,5-diene ligand is easily displaced from these salts by sodium diethyldithiocarbamate to give the neutral compounds Pt(CH₃)(S₂CNEt₂) L. Ethyl and, p-tolyl isocyanide react with [Pt(CH₃)(π-1,5-C₈H₁₂)(solvent)](PF₆) to give [Pt(CH₃)(CNR)₃](PF₆). The reaction of [Pt(CH₃)(CN–C₆H₄–CH₃)₃](PF₆) with sodium benzenethiolate gives cis-Pt(CH₃)(SC₆H₆)(CNC₆H₄CH₃)₂ and with dialkylamines gives trans-[Pt(CH₃)(CNC₆H₄CH₃){:C(NR₂)(NHC₆H₄CH₃)}₂](PF₆).