Crystal structure, physical properties and electronic structure of a new organic conductor B"-(BEDT-TTF){sub 2}SF{sub 5}CHFCF{sub 2}SO{sub 3}.

Journal Article · Mon Jan 01 04:00:00 EST 2001 · J. Mater. Chem.

DOI:https://doi.org/10.1039/b008735l· OSTI ID:943105

Schlueter, J A; Ward, B H; Geiser, U; Wang, H H; Kini, A M; Parakka, J; Morales, E; Koo, H -J; Whangbo, M -H; Winter, R W; Mohtasham, J; Gard, G L

A new organic conductor, {beta}'-(BEDT-TTF){sub 2}SF{sub 5}CHFCF{sub 2}So{sub 3}[BEDT-TTF, hereafter abbreviated ET, refers to bis(ethylenedithio)tetrathiafulvalene], was prepared by electrocrystallization. The crystal structure of this salt was determined by single crystal X-ray diffraction at 298 and 150 K, its physical properties were examined by electrical resistivity, Raman spectroscopy and EPR measurements, and its electronic structure was calculated and compared with that of the analogous salt {beta}'-(ET){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3}. Whereas {beta}'-(ET){sub 2}SF{sub 5}CHFCF{sub 2}SO{sub 3} has disordered anions and undergoes a metal-to-insulator transition at {approx}190 K, {beta}'-(ET){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3} has ordered anions and is semiconducting down to {approx}100 K, metallic below {approx}100 K, and superconducting below 5 K. At room temperature both {beta}'-(ET){sub 2}SF{sub 5}CHFCF{sub 2}SO{sub 3} and {beta}'(ET){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3} have similar electronic band structures and physical properties. When the temperature is lowered, each donor molecule stack becomes dimerized in both salts. However, the interdimer interaction within each donor stack nearly vanishes in {beta}'-(ET){sub 2}SF{sub 5}CHFCF{sub 2}SO{sub 3}, but remains substantial in {beta}'-(ET){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3}.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 943105
• Report Number(s): ANL/MSD/JA-37513
• Journal Information: J. Mater. Chem., Journal Name: J. Mater. Chem. Journal Issue: 8 ; 2001 Vol. 11; ISSN JMACEP; ISSN 0959-9428
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
ANIONS
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRON SPIN RESONANCE
ELECTRONIC STRUCTURE
INTERACTIONS
MOLECULES
MONOCRYSTALS
ORGANIC SUPERCONDUCTORS
PHYSICAL PROPERTIES
RAMAN SPECTROSCOPY
SALTS
STACKS
X-RAY DIFFRACTION