Platinum(II) complexes containing a cationic amine ligand: crystal structure of [(2-aminoethyl)ammonium]trichloroplatinum(II)

Abstract

The complex [PtCl(dms)(en)]Cl (dms = dimethyl sulphide and en = 1,2-diaminoethane) reacts with concentrated hydrochloric acid displacing one end of en and substituting dms by Cl^–, to form [PtCl₃(Hen)](Hen = monoprotonated en). The structure of this compound has been solved by Patterson and Fourier methods and refined by full-matrix least squares to R= 0.030 for 1 326 observed reflections. The structure consists of zwitterionic molecules in which the co-ordination around the metal is square planar with three chlorine and one nitrogen atom from the mono-protonated en ligand. The conformation of the organic ligand is gauche with a hydrogen bond between the ammonium group and a cis chlorine atom; the same ligand in [PtCl₅(Hen)] had a perfectly trans conformation.