Bindungsisomere Hexakis(thiocyanato-isothiocyanato)osmate(III) /Bond-Isomeric Hexakis(thiocyanato-isothiocyanato)osmates(III)

Abstract

Abstract On treatment of K2[OsX6], X = Cl, Br, I with KSCN in aqueous solution mixtures of bond-isomeric hexakis(thiocyanato-isothiocyanato)complexes, [Os(NCS)n(SCN)6-n] 3-, n = 1-6, are formed. At low temperatures and short reaction times species with more S-bonded, after longer boiling species with more N-bonded ligands are preferred, indicating the increase of thermodynamic stability with growing n-values. The isolation of the pure bond isomers n = 1-6, is achieved by ion exchange chromatography on diethylaminoethyl-cellulose. The assignment of the individual species is based upon the intensity ratios of characteristic group frequencies in the IR and Raman spectra. The UV-VIS spectra also show significant shifts within the series.