Structure of bis(ethylenedithio) tetrathiafulvalenium dichlorocyanoselenate (2:1), (BEDT-TTF)(sub 2)Cl(sub 2)SeCN

摘要

The electron donor molecule BEDT-TTF has yielded approximately 50 superconductors to date. In addition, numerous other salts with a variety of electrical and magnetic properties have been discovered. Recently, the authors reported a semiconducting salt of BEDT-TTF with the novel T-shaped anion Br(sub 2)SeCN(sup (minus)2). The crystallographic analysis of that salt revealed a near-centrosymmetric triclinic structure, except for the symmetry-breaking anion. On the basis of a Hamilton R-value test, the non-centrosymmetric space group P1 with ordered anions was preferred over centrosymmetric P(bar 1) with disordered anions. In this paper, the authors present the synthesis and crystal structure of the isostructural chlorine-analogue salt (BEDT-TTF)(sub 2)Cl(sub 2)SeCN.