Cyanide exchange of the methyltricyanoplatinate(II) dianion: temporal resolution of cis and trans cyanide exchange

Square planar anions of the type [PtR(CN) 3 ] 2- have been subject to exchange with aqueous 13 CN - (exchange kinetics followed by 13 C NMR). The coordinated alkyl group produces two distinct environments for the coordinated cyanide ligands, which consequently exchange with exogenous CN - at two different rata. With R=CH 3 , 3, the exchange of cis CN - is 10 -3 and trans CN - is 10 -7 times slower than the same process for the reference compound [Pt(CN) 4 ] 2-