J. Phys. IV France
Volume 114, April 2004
Page(s) 439 - 443

J. Phys. IV France
114 (2004) 439
DOI: 10.1051/jp4:2004114103

A new approach in the design of organic superconductors

J. Yamada

Department of Material Science, Graduate School of Science, Himeji Institute of Technology, 3-2-1 Kouto, Kamigori-cho, Ako-gun, Hyogo 678-1297, Japan

The preparation of charge-transfer (CT) salts of DODHT [(1,4-dioxane-2,3-diyldithio) dihydrotetrathia-fulvalene], BDH-TTP [2,5-bis(1,3-dithiolan-2-ylidene)-1,3,4,6-tetrathiapentalene] and BDA-TTP [2,5-bis(1,3-dithian-2-ylidene)-1,3,4,6-tetrathiapentalene] has been investigated to develop new organic superconductors. The DODHT and BDA-TTP donors give organic superconductors (DODHT) 2BF $_{4}\cdot $H 2O and (BDA-TTP) 2X (X = GaCl 4 and FeCl 4) under applied pressures, whereas (BDH-TTP)Br 0.88 and (BDA-TTF) 2X (X = BF 4, BF $_{4}\cdot $H 2O and ClO 4) fail to exhibit superconductivity at ambient pressure. Key words. Organic superconductor - $\pi $-electron donor - $\sigma $-bond framework - loose donor packing motif.

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