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Crystals 2012, 2(2), 284-293; doi:10.3390/cryst2020284

Article

New BEDT-TTF Radical Cation Salt with Mixed Anions: α'-[BEDT-TTF]₂[CuBr₂]_0.4[CuCl₂]_0.6

Kazuya Kubo ^1,2,*  and Masahiro Yamashita ²

¹ Research Institute for Electronic Science, Hokkaido University, Sapporo 001-0020, Japan ² Department of Chemistry, Graduate School of Science Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-ku, Sendai, 980-8578, Japan

* Author to whom correspondence should be addressed.

Received: 8 March 2012; in revised form: 13 April 2012 / Accepted: 13 April 2012 / Published: 23 April 2012

(This article belongs to the Special Issue Molecular Conductors)

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Abstract: A new mixed-anion crystal composed of BEDT-TTF radical cation salt [BEDT-TTF]₂(CuBr₂)_0.4(CuCl₂)_0.6 with an α'-type donor arrangement with a formal charge of +0.5 per BEDT-TTF was prepared by using a chemical oxidation method and characterized by using X-ray diffraction, four-probe electrical resistivity measurements (semiconductor: ρ_rt = 2 × 10² Ω cm, E_a = 0.2 eV), and energy band calculations. The results showed that this system had a quasi-one dimensional Fermi surface.

Keywords: molecular conductor; mixed crystal; BEDT-TTF; quasi-one dimensional character; α'-type donor arrangement; Mott-Hubbard insulator

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