Electrophilic binuclear methylplatinum(II) complexes

The bis(bidentate) ligands trans- and cis-1,2-C6H10(N=CH-2-C5H4N)(2) (1 and 2) yield the diplatinum(II) complexes trans- and cis-1,2-[C6H10{N=CH-2-C5H 4N(PtMe2)}(2)] (3 and 4, respectively). Reaction of 3 and 4 with [H](+)[HOB (C6F5)(3)](-) in MeCN or with HBF4 in the presence of excess CO gave the co rresponding electrophilic binuclear complexes trans- and cis-1,2-[C6H10{N=C H-2-C5H4N(PtMeL)}(2)][X](2) (5, trans, L = MeCN, X = [HOB(C6F5)(3)]; 6, cis , L = MeCN, X = [HOB(C6F5)(3)]; 7, trans, L = CO, X = BF4; 8, cis, L = CO, X = BF4). The electrophilic complexes 5-8 are formed by selective methyl gr oup protonolysis, and the stereochemistries were confirmed for complexes 7 and 8 by X-ray structure determinations.