Molecular conductors from bis(ethylenedithio)tetrathiafulvalene with tris(oxalato)rhodate

Lee Martin; Alexander L. Morritt; Jordan R. Lopez; Yasuhiro Nakazawa; Hiroki Akutsu; Shusaku Imajo; Yoshihiko Ihara; Bin Zhang; Yan Zhang; Yanjun Guo

doi:10.1039/C7DT00881C

Molecular conductors from bis(ethylenedithio)tetrathiafulvalene with tris(oxalato)rhodate†

Lee Martin,

*^a Alexander L. Morritt,

^a Jordan R. Lopez,^a Yasuhiro Nakazawa,^b Hiroki Akutsu,^b Shusaku Imajo,^b Yoshihiko Ihara,^c Bin Zhang,^d Yan Zhang^e and Yanjun Guo^f

Author affiliations

* Corresponding authors

^a School of Science and Technology, Nottingham Trent University, Clifton Lane, Clifton, Nottingham, UK
E-mail: lee.martin@ntu.ac.uk

^b Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan

^c Department of Quantum and Condensed Matter Physics, School of Science, Hokkaido University, Kita-ku, Sapporo, Hokkaido, Japan

^d Organic Solid Laboratory, BNLMS, CMS & Institute of Chemistry, Chinese Academy of Sciences, Beijing, P. R. China

^e Institute of Condensed Matter and Material Physics, Department of Physics, Peking University, Beijing, P. R. China

^f National Center for Nanoscience and Technology, Beijing, P. R. China

Abstract

This article reports a family of new radical-cation salts of bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) with tris(oxalato)rhodate: three salts with the formula β′′-(BEDT-TTF)₄[(cation)Rh(C₂O₄)₃]·solvent (solvent = fluorobenzene, chlorobenzene, or bromobenzene) and one with the formula pseudo-κ-(BEDT-TTF)₄[(NH₄)Rh(C₂O₄)₃]·benzonitrile. We report here the syntheses, crystal structures, electrical properties and Raman spectroscopy of these new molecular conductors. The bromobenzene salt shows a decrease in resistivity below 2.5 K indicative of a superconducting transition and a Shubnikov–de Haas oscillation with a frequency of 232 T and effective mass m* of 1.27m_e.

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Molecular conductors from bis(ethylenedithio)tetrathiafulvalene with tris(oxalato)rhodate†

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