The first ET salt with a metal complex anion containing a selenocyanate ligand, (ET)2TIlHg(SeCN)4 : synthesis, structure and properties

Abstract

Synthesis of the first ET salt with a metal complex anion containing a selenocyanate ligand, α-(ET)2TlHg(SeCN)4, and its structure are reported. The temperature dependence of conductivity and thermopower in varions crystallographic directions and the Shubnikov-de Haase oscillations have been studied. Distinctions of the bond length distributions in three crystallographically independent ET have been found, which may result in some charge localization in the radical-cation layer. A detailed comparison of the structure and properties of the compound obtained to its thiocyanate analog has been performed. It bas been shown that in the α-(ET)2TIHg(SeCN)4 salt there is no low-temperature phase transition characteristic of the α-(ET)2MHg(SCN)4 compounds with M=K, Tl and Rb