J. Phys. IV France
Volume 114, April 2004
Page(s) 549 - 551

J. Phys. IV France
114 (2004) 549
DOI: 10.1051/jp4:2004114130

Conducting properties of tris-fused tetrathiafulvalenes

T. Mori1, M. Ashizawa1, S. Kimura1, A. Akutsu-Sato1, B. Noda1, Y. Misaki2 and K. Tanaka2

1  Department of Organic Materials, Tokyo Institute of Technology, O-okayama, Tokyo 152-8552, Japan
2  Division of Molecular Engineering, Graduate School of Engineering, Kyoto University, Yoshida, Kyoto 606-8501, Japan

Tris-fused tetrathiafulvalenes, TTC n-TTPY ( n = 2-5) have been prepared, and the structural and conducting properties have been investigated. The neutral crystals of TTC n-TTPY exhibit low electrical resistivity as a neutral organics; the lowest is 80 $\Omega $cm in TTC 2-TTPY. When TTC n-TTPY is exposed to iodine vapor, the sample becomes highly conducting in a few minutes, but again becomes insulating on account of overdoping. When taken out from the iodine atmosphere, the high conducting state is recovered, and the high conducting sample shows metallic conductivity and thermoelectric power down to helium temperatures. Key words. TTF - conductivity - thermoelectric power.

© EDP Sciences 2004