Abstract

Abstract A combination of DAP and CHL gives two kinds of 1:1 charge transfer complex crystals from the benzene solution. Both of them are electrically insulating at the initial states. The α-form single crystal, however, undergoes an irreversible conductivity change upon mild heating or fracture of the crystal. In both cases, the conductivity change amounts to 10 6 to 10 7 , and the resultant solids are a highly conducting semiconductor. The structural, optical, magnetic, and solid-state NMR studies suggest that the low-resistant phase is mainly composed of the neutral molecules despite its high conductivity.

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