Co-ordination of NNN′N′-tetramethylethylenediamine and 1,4-dimethylpiperazine with certain transition metals. The identity of the supposed iridium derivatives

Abstract

The property of the above diamines to act as chelating agents, forming stable five-membered ring systems with PdCl₂, PdBr₂, PtCl₂, and IrCl₂, and similar but less-stable systems with Cd^II and Cu^II have been recorded. The compounds with PtCl₂ are very readily formed from hexachloroplatinic(IV) acid, but the compounds from K₂[IrCl₆] were very slowly formed with much reduction to the metal.

It is now shown beyond doubt that the supposed iridium compounds were in fact platinum compounds, formed from platinum(IV) chloride present as an impurity in the iridium(IV) chloride employed.