J. Phys. IV France 114 (2004) 521
Crystal structures and electrical conductivities controlled by CH/n interactionsS. 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
2 CREST, JST
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 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 '-type structure, which could be Mott insulators. The pyrazino-fused donor C5DTP-TTF afford a variety of donor arrangements by the S N interaction and the steric hindrance: -(C5DTP-TTF) 2X (X= AsF 6, SbF 6) are semiconductors, whereas "-(C5DTP-TTF) 2TaF 6 reveal the metallic down to 150 K. Key words. Synthesis, TTF derivative, charge-transfer complex, crystal structure, CH/n interaction.
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