1. Trifluoromethylsulfonyl-Based Salts of BEDT-TTF: Crystal and Electronic Structures and Physical Properties11
- Author
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John A. Schlueter, Urs Geiser, Brian H. Ward, Roxanne G. Daugherty, James P. Parakka, Lawrence K. Montgomery, P. G. Nixon, Hsien-Hau Wang, Hyung-Jun Koo, M. E. Kelly, Gary L. Gard, Rolf W. Winter, Aravinda M. Kini, and M.-H. Whangbo
- Subjects
biology ,Chemistry ,Inorganic chemistry ,Charge density ,Electronic structure ,Crystal structure ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,law.invention ,Inorganic Chemistry ,Crystallography ,chemistry.chemical_compound ,law ,X-ray crystallography ,Materials Chemistry ,Ceramics and Composites ,biology.protein ,Physical and Theoretical Chemistry ,Electronic band structure ,Electron paramagnetic resonance ,Tetrathiafulvalene ,Organic anion - Abstract
Three 2 : 1 salts of the organic donor molecule bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF or ET) with trifluoromethylsulfonyl-based anions N(SO2CF3)2−, CH(SO2CF3)2− and C(SO2CF3)3− were prepared by electrocrystallization. These salts were characterized by single-crystal X-ray diffraction, electron spin resonance (ESR) spectroscopy, electrical resistivity measurements and electronic band structure calculations. (ET)2N(SO2CF3)2 is a two-dimensional (2D) metal, but its ESR spin susceptibility above 150 K shows a weakly semiconducting behavior, presumably because during ESR measurements the sample cooling rate is slow hence allowing the disordered anions to readjust their positions. (ET)2CH (SO2CF3)2 is a 2D metal and undergoes a metal-to-insulator (MI) transition at 110 K due probably to a geometry change of the donor molecule layers. (ET)2C(SO2CF3)3 is a one-dimensional (1D) metal and undergoes an MI between 180 and 240 K, which is expected to be of charge density wave type.
- Published
- 2002
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