The preparation and reactions of a π-bound organic isoselenocyanate complex of platinum: Formation of an η2-diselenocarbonimidato complex

Reaction of Pt(Ph₃P)₂C₂H₄ with p-tolyl isoselenocyanate yields the first known example of a π-bound organic isoselenocyanate ligand in the complex Pt(η²-SeCNC₇H₇)(Ph₃P)₂. Reaction of this complex with methyl iodide results in alkylation at the selenium atom rather than at nitrogen, with resultant loss of selenium to yield PtI₂(CNC₇H₇)(Ph₃P) as the final product. If the reaction of Pt(Ph₃P)₂C₂H₄ with p-tolyl isoselenocyanate is carried out in CH₂Cl₂ solution, selenium abstraction occurs and the complex Pt(η²-Se₂CNC₇H₇)-(CNC₇H₇)(Ph₃P) is formed which contains both an isonitrile ligand and the as yet unreported diselenocarbonimidato ligand. Alkylation of this ligand failed to yield a diselenocarbamate complex.