Synthesis, Structure and Properties of (BEDT-TTF)₄Hg₃I₈, a New Organic Bis(ethylenedithio)tetrathiafulvalene-Based Conductor with an Octaiodinemercurate Anion

Abstract

Abstract The structure of a new organic conductor, (BEDT-TTF)4Hg3I8, has been solved, temperature dependences on conductivity, thermopower and magnetic susceptibility studied. The BEDT-TTF molecules form two different types of stacks. At 260 K a jump in a conductor and thermopower takes place, characterized by a hysteresis of ca. 8 K. At this temperature the phase transition of the first order occurs in (BEDT-TTF)4Hg3I8. Below and above the transition temperature the conductivity has an activation character. At a pressure of 29 kbar the conductivity remains metallic up to 50 K. The paramagnetic susceptibility in this temperature range has a maximum.