Optical properties of {beta}"-(ET){sub 2}SF{sub 5}RSO{sub 3} (R=CH{sub 2}CF{sub 2}, CHFCF{sub 2} : changing physical properties by chemical tuning of the counterion.
We report the polarized infrared reflectance of {beta}''-(ET){sub 2}SF{sub 5}CHFCF{sub 2}SO{sub 3} as a function of temperature. This salt is a derivative of the first fully organic superconductor, {beta}''-(ET){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3}, where the nature of the alkyl group has been modified to contain a chiral center. This small chemical modification has a dramatic effect on the spectral and charge transport properties. The {beta}''-(ET){sub 2}SF{sub 5}CHFCF{sub 2}SO{sub 3} complex displays highly anisotropic behavior compared with the superconducting material; the essential difference is observed in the {perpendicular}b direction where the interdimer interaction is weak, in agreement with recent theoretical calculations. The temperature dependence of key anion vibrational modes is discussed in terms of intermolecular hydrogen bonding within the anion pocket. That small chemical modifications of the anion template result in such striking changes in the physical properties suggests that the {beta}''-(ET){sub 2}SF{sub 5}RSO{sub 3} system is quite close to a Mott phase boundary.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 942588
- Report Number(s):
- ANL/CHM/JA-32791
- Journal Information:
- Chem. Mater., Journal Name: Chem. Mater. Journal Issue: 11 ; Nov. 1999 Vol. 11; ISSN CMATEX; ISSN 0897-4756
- Country of Publication:
- United States
- Language:
- ENGLISH
Similar Records
Optical properties of {beta}{double{underscore}prime}-(ET){sub 2}SF{sub 5}RSO{sub 3} (R = CH{sub 2}CF{sub 2}, CHFCF{sub 2}): Changing physical properties by chemical tuning of the counterion
Optical studies of the {beta}{double_prime}-(ET){sub 2}SF{sub 5}RSO{sub 3} R = CH{sub 2}CF{sub 2}, CHFCF{sub 2} and CHF system: Chemical tuning of the counterion
Optical spectra and electronic band structure calculations of {beta}'-(ET){sub 2}SF{sub 5}RSO{sub 3} (R=CH{sub 2}CF{sub 2}, CHFCF{sub 2} and CHF) : changing electronic properties by chemical tuning of the counterion.
Journal Article
·
Sun Oct 31 23:00:00 EST 1999
· Chemistry of Materials
·
OSTI ID:20004027
Optical studies of the {beta}{double_prime}-(ET){sub 2}SF{sub 5}RSO{sub 3} R = CH{sub 2}CF{sub 2}, CHFCF{sub 2} and CHF system: Chemical tuning of the counterion
Conference
·
Mon Jul 24 00:00:00 EDT 2000
·
OSTI ID:759057
Optical spectra and electronic band structure calculations of {beta}'-(ET){sub 2}SF{sub 5}RSO{sub 3} (R=CH{sub 2}CF{sub 2}, CHFCF{sub 2} and CHF) : changing electronic properties by chemical tuning of the counterion.
Journal Article
·
Tue Aug 01 00:00:00 EDT 2000
· Chem. Mater.
·
OSTI ID:942939