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

Dalton Trans. 2017 Jul 25;46(29):9542-9548. doi: 10.1039/c7dt00881c.

Authors

Affiliations

¹ School of Science and Technology, Nottingham Trent University, Clifton Lane, Clifton, Nottingham, NG11 8NS, UK. lee.martin@ntu.ac.uk.
² Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan.
³ Department of Quantum and Condensed Matter Physics, School of Science, Hokkaido University, Kita-ku, Sapporo, 060-0810, Hokkaido, Japan.
⁴ Organic Solid Laboratory, BNLMS, CMS & Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
⁵ Institute of Condensed Matter and Material Physics, Department of Physics, Peking University, Beijing, 100871, P. R. China.
⁶ National Center for Nanoscience and Technology, Beijing, 100190, P. R. China.

PMID: 28702555
DOI: 10.1039/c7dt00881c

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.