Tetrathiapentalene-based organic conductors with 1 ∶ 1 composition

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We have prepared TTM-TTP-based (TTM-TTP = 2,5-bis[4,5-bis(methylthio)-1,3-dithiol-2-ylidene]-1,3,4,6-tetrathiapentalene) organic conductors with 1 ∶ 1 composition including tetrahedral anions in order to elucidate electronic properties of half-filled conductors. We have obtained three new 1 ∶ 1 composition salts (TTM-TTP)GaCl4(PhCl)0.5, (TTM-TTP)GaBr4(PhCl)0.5, and (TTM-TTP)GaBr2.0Cl2.0(PhCl)0.5, which have dimerized donor columns. (TTM-TTP)GaCl4(PhCl)0.5 shows paramagnetism in spite of the apparent band-insulating electronic structure. In addition we have obtained a metal alloy salt, (TTM-TTP)Fe0.9Ga0.1Cl4. This salt has uniform donor columns and shows high electrical conductivity.

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