Trifluoromethylmetallate anions as components of molecular charge transfer salts and superconductors

• Published in: Coordination chemistry reviews 1999-09, Vol.190, p.781-810
• Main Authors: Schlueter, John A., Geiser, Urs, Kini, Aravinda M., Wang, Hau H., Williams, Jack M., Naumann, Dieter, Roy, Thomas, Hoge, Berthold, Eujen, Reint
• Format: Article
• Language: English
• Subjects: Organic superconductor; Tetrakis(trifluoromethyl)metallate anions
• ISSN: 0010-8545; 1873-3840
• DOI: 10.1016/S0010-8545(99)00121-6

Whereas polymeric and common inorganic anions frequently deprive the synthetic chemist of a chance to modify a charge transfer salt’s structure through anion alterations, discrete organometallic anions provide a vast opportunity to probe the structure/property correlations of a material through rational synthetic methods. We have recently undertaken a research effort aimed at the crystallization of conducting charge transfer salts which possess modifiable, organometallic anions as the charge compensating entities. This research has been richly rewarded with the discovery of a new family of bis(ethylenedithio)tetrathiafulvalene (BEDT–TTF or ET) based molecular superconductors. Herein is presented a summary of over 20 κ(ET) 2M(CF 3) 4(1,1,2-trihaloethane) (M=Cu, Ag, Au) superconducting salts. Three new related salts are also reported: (ET) 2[ trans-Ag(CF 3) 2(CN) 2], κ L(BEDT-TSF) 2Ag(CF 3) 4(TCE), and κ L(ET) 2Ag(CF 3) 3Cl(TCE).