Charge transfer coupling to B1u modes in BEDT-TTF salts

We have studied the infrared absorption spectra of BEDT-TTF [bis(ethylene-dithio)tetrathiafulvalene] charge-transfer crystals with different anions [I3, Cl04, SbF6, Cu(NCS)2] focusing on bands related to C=C double bond stretching vibrations. The coupling of charge transfer to b1u modes of BEDT-TTF...

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Bibliographic Details
Published in:Synthetic metals 1993-03, Vol.56 (1), p.2217-2221
Main Authors: SWIETLIK, R, GARRIGOU-LAGRANGE, C
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Infrared and raman spectra and scattering
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Physics
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Summary:We have studied the infrared absorption spectra of BEDT-TTF [bis(ethylene-dithio)tetrathiafulvalene] charge-transfer crystals with different anions [I3, Cl04, SbF6, Cu(NCS)2] focusing on bands related to C=C double bond stretching vibrations. The coupling of charge transfer to b1u modes of BEDT-TTF molecule is considered. Similar investigations have been performed for some compounds based on related molecules [DIMET, BVDT-TTF and BDMVDT-TTF with Cl04, AsF6 and SbF6 anions, respectively]. The influence of metal-insulator transitions on IR bands assigned to b1u modes (C=C stretching vibrations) was observed and discussed as a consequence of modifications of the charge distribution.
ISSN:0379-6779
1879-3290
DOI:10.1016/0379-6779(93)90400-Q