Preparation, structures and physical properties of selenium analogues of DTEDT as promising donors for organic metals

Hideki Fujiwara; Yohji Misaki; Tokio Yamabe; Takehiko Mori; Hatsumi Mori; Shoji Tanaka

doi:10.1039/B002790L

Hideki Fujiwara,†^a Yohji Misaki,*^a Tokio Yamabe,^a Takehiko Mori,^b Hatsumi Mori^c and Shoji Tanaka^c

* Corresponding authors

^a Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Yoshida, Kyoto, Japan
E-mail: misaki@mee3.moleng.kyoto-u.ac.jp
Fax: 81-75-771-0172
Tel: 81-75-753-5933

^b Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, O-okayama, Tokyo, Japan

^c International Superconductivity Technology Center, Shinonome, Tokyo, Japan

Abstract

Three selenium analogues of DTEDT [2-(1,3-dithiol-2-ylidene)-5-[2-(1,3-dithiol-2-ylidene)ethylidene]-1,3,4,6-tetrathiapentalene] have been synthesized. They showed four pairs of single-electron redox waves. The E₁ values are a little higher by 0.02–0.05 V than that of DTEDT. On the other hand, the E₂−E₁ values are almost equal to that of DTEDT. Their TCNQ complex and cation radical salts show fairly high electrical conductivities and several salts exhibit metallic conductivities. In particular the ReO₄⁻ and Au(CN)₂⁻ salts of DTEDS and the SbF₆⁻, TaF₆⁻ and I₃⁻ salts of DSEDS exhibited stable metallic behaviour down to 1.5–4.2 K. An X-ray crystal structure analysis of the metallic salt (DSEDS)₃TaF₆ reveals that this salt has a two-dimensional β-type packing motif of the donor molecules similar to the superconducting (DTEDT)₃Au(CN)₂. The calculated Fermi surface of (DSEDS)₃TaF₆ is a two-dimensional closed ellipsoid.

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Article information

DOI: https://doi.org/10.1039/B002790L
Article type: Paper
Submitted: 05 Apr 2000
Accepted: 18 Apr 2000
First published: 13 Jun 2000

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J. Mater. Chem., 2000,10, 1565-1572

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