Trifluoromethylsulfonyl-based salts of BEDT-TTF : crystal and electronic structures and physical properties.
Three 2 : 1 salts of the organic donor molecule bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF or ET) with trifluoromethylsulfonyl-based anions N(SO{sub 2}CF{sub 3}){sub 2}{sup -}, CH(SO{sub 2}CF{sub 3}){sub 2}{sup -} and C(SO{sub 2}CF{sub 3}){sub 3}{sup -} 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){sub 2}N(SO{sub 2}CF{sub 3}){sub 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){sub 2}N(SO{sub 2}CF{sub 3}){sub 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){sub 2}N(SO{sub 2}CF{sub 3}){sub 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.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC; NSF; OUS
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 949525
- Report Number(s):
- ANL/MSD/JA-41752
- Journal Information:
- J. Solid State Chem., Journal Name: J. Solid State Chem. Journal Issue: 2 ; Nov. 1, 2002 Vol. 168; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- ENGLISH
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