Hemilability and regioselectivity in palladium and platinum complexes of dppm( E) [ E = O, S, Se] ligands

Abstract

Hemilability and nonrigidity in a series of mixed P^P E donor ligands where E = O, S, or Se have been studied in palladium and platinum complexes of the type [M{κ 2-(dimethylamino)ethylnaphthyl- C,N)}( P^P E)][SbF 6] where P^P E = Ph 2PCH 2P( E)Ph 2.The role of the donor in hemilability, regioselectivity and the binding preferences of particular donors trans to the metallated carbon atom were also investigated. NMR parameters including couplings to 195Pt and 77Se were investigated for cis and trans isomers. The magnitude of 2 J 13C– 77Se couplings can readily distinguish the cis and trans isomers. A large through-space 13C– 77Se 3 J coupling was observed in one of the amino methyl groups of the dppm(Se) complexes.