Trifluoromethylsulfonyl-Based Salts of BEDT-TTF: Crystal and Electronic Structures and Physical Properties11 |
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| Authors: | John A. Schlueter Urs GeiserH.Hau Wang Aravinda M. KiniBrian H. Ward James P. ParakkaRoxanne G. Daugherty Margaret E. KellyPaul G. Nixon Rolf W. WinterGary L. Gard Lawrence K. MontgomeryH.-J. Koo M.-H. Whangbo |
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| Affiliation: | a Materials Science Division, Argonne National Laboratory, 9700 South Cass Ave., Bldg. 200, Argonne, IL 60439-4831b Department of Chemistry, Portland State University, Portland, OR 97207-0751c Department of Chemistry, Indiana University, Bloomington, IN 47405, USAd Department of Chemistry, North Carolina State University, Raleigh, NC 27695-8204 |
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| 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. |
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| Keywords: | BEDT-TTF trifluoromethylsulfonyl anions charge transfer salt electrical conductivity. |
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