Novel charge transfer salts of BEDT-TTF with metal oxalate counterions

Rashid, S., Turner, S. S., Day, P., Light, M. E., Hursthouse, M. B. and Guionneau, P. (2001) Novel charge transfer salts of BEDT-TTF with metal oxalate counterions. Synthetic Metals, 120 (1-3), 985-986. (doi:10.1016/S0379-6779(00)00856-0).

Abstract

The preparation, crystal structures and properties of three new BEDT-TTF, bis(ethylenedithio)tetrathiafulvalene, (ET for short), charge transfer salts beta " (ET)(4).[(H3O)Cr(C2O4)(3)].C6H5NO2 I, beta " (ET)(4).[(H3O)Fe(C2O4)(3)].C6H5NO2 II and (ET)(4). Fe-2(C2O4)(5)] III are reported. The structures of I and II consist of alternating layers of ET and an approximately hexagonal network formed by H3O+ and the metal with the solvent molecule, C6H5NO2, occupying hexagonal cavities in the anion layer. Both C6H5NO2 salts are superconducting, the iron salt having a T-c of 6.2 K and the chromium salt having a T-c of 5.8 K. The structure of(ET)(4)Fe-2(C2O4)(5)] consists of an iron oxalate bridged dimer, (Fe-Fe distance 5.472 Angstrom), interspersed with ET in a "checker board" arrangement. It is monoclinic and crystallises in the P2(1)/n space group. At 150 K a = 16.8068 (3) Angstrom, b = 10.9556 (2) Angstrom, c = 19.4109 (3) Angstrom, beta = 102.1593 (9) degrees and V = 3493.92 (10) Angstrom (3). Squid measurements show short range antiferromagnetic ordering.

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Contributors

Author: M. E. Light

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