Charge disproportionation in the charge-transfer salts of TTP

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The metal-insulator phase transition accompanying charge disproportionation was studied for two charge-transfer salts, θ-(BDT-TTP) 2 Cυ(NCS) 2 and (TTM-TTP)I 3 . In the former compound, the localized generates a charge disproportionation such as (+0.1, +0.9). On the other hand, the charge disproportionation was not found in (TTM-TTP)I 3 . Alternatively, the intra-molecular charge distribution becomes asymmetric below the phase transition temperature Both phenomena are derived from the localization of charge with a symmetry breaking.

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