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....

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Bibliographic Details
Published in:Journal of solid state chemistry 2002-11, Vol.168 (2), p.524-534
Main Authors: SCHLUETER, John A, GEISER, Urs, GARD, Gary L, MONTGOMERY, Lawrence K, KOO, H.-J, WHANGBO, M.-H, HAU WANG, H, KINI, Aravinda M, WARD, Brian H, PARAKKA, James P, DAUGHERTY, Roxanne G, KELLY, Margaret E, NIXON, Paul G, WINTER, Rolf W
Format: Article
Language:English
Subjects:
ANIONS
BEDT-TTF
CHARGE DENSITY
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Conductivity phenomena in semiconductors and insulators
ELECTRIC CONDUCTIVITY
Electron density of states and band structure of crystalline solids
ELECTRON SPIN RESONANCE
Electron states
ELECTRONIC STRUCTURE
Electronic transport in condensed matter
Exact sciences and technology
GEOMETRY
Heterocyclic compounds
Low-field transport and mobility
piezoresistance
MATERIALS SCIENCE
Organic compounds
PHYSICAL PROPERTIES
Physics
Polymers and organic compounds
SPECTROSCOPY
SPIN
Structure of solids and liquids
crystallography
Structure of specific crystalline solids
X-RAY DIFFRACTION
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Summary: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.
ISSN:0022-4596
1095-726X
DOI:10.1006/jssc.2002.9750