J. Phys. IV France
Volume 114, April 2004
Page(s) 521 - 522

J. Phys. IV France
114 (2004) 521
DOI: 10.1051/jp4:2004114122

Crystal structures and electrical conductivities controlled by CH/n interactions

S. Kimura1, 1, 2, 1, H. Suzuki1, T. Maejima1, 1, 3, M. Suto1, 1, 4, K. Yamashita1, 1, 4, S. Ichikawa1, 1, 3, H. Mori1, 1, 2, H. Moriyama3, T. Mochida3, Y. Nishio4 and K. Kajita4

1  Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
3  Department of Chemistry, Toho University, Funabashi, Chiba 274-8510, Japan
4  Department of Physics, Toho University, Funabashi, Chiba 274-8510, Japan

A series of new TTF derivatives, CnDT-EDO-TTF ( n= 5,6), CnDT-EDT-TTF ( n= 5,6), and CnDTP-TTF ( n= 5,6) have been synthesized. As for the CnDT-EDO-TTF salts, the intermolecular CH $\cdot \cdot \cdot $O interactions construct the pseudo-2D electronic state, which stabilizes the metallic character down to 1.3 K. The sulfur based C5DT-EDT-TTF salts preferred the dimeric $\beta $'-type structure, which could be Mott insulators. The pyrazino-fused donor C5DTP-TTF afford a variety of donor arrangements by the S $\cdot \cdot \cdot $N interaction and the steric hindrance: $\kappa $-(C5DTP-TTF) 2X (X= AsF 6, SbF 6) are semiconductors, whereas $\beta $"-(C5DTP-TTF) 2TaF 6 reveal the metallic down to 150 K. Key words. Synthesis, TTF derivative, charge-transfer complex, crystal structure, CH/n interaction.

© EDP Sciences 2004