Abstract
Abstract The electrical resistivity of the 5,6 : 11,12-bis(epidithio)naphthacene(TTT)–iodine system was examined using poly crystalline compactions. The room-temperature resistivity reaches a minimum of 0.3 ohm cm at the composition of the well-studied metallic phase, TTT–I1.5, and a shoulder as large as 200 ohm cm occurs at the composition of the other metallic phase, TTT–I2.7. The apparent activation energy for semiconduction at the latter composition is as much as 0.13 eV, indicating some semiconductor behavior in directions other than the needle axis. The appearance of the latter phase is also manifested by a drastic increase in the Seebeck coefficient near this composition, which corresponds to a change in the amount of charge per TTT molecule from 0.68 to 0.85. The diffuse reflection spectra were recorded for TTT–I1.53 and TTT–I2.79. The resemblance between the spectrum of the iodine-rich complex and that of TTT–Br is noted.
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