FT-IR investigations of (BEDT-TTF)2I3 radical salts

Fourier transform infrared absorption spectra of structurally different phases of the radical cation salt (BEDT-TTF)2I3 in the range of the molecular vibrations of the donor are presented. The low-temperature spectra provide exact fingerprints of the different phases as long they have different unit...

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Bibliographic Details
Published in:Synthetic metals 1993-03, Vol.56 (1), p.2554-2559
Main Authors: Moldenhauer, J., Pokhodnia, K.I., Schweitzer, D., Keller, H.J.
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Lattice dynamics
Phonon states and bands, normal modes, and phonon dispersion
Phonons and vibrations in crystal lattices
Physics
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Summary:Fourier transform infrared absorption spectra of structurally different phases of the radical cation salt (BEDT-TTF)2I3 in the range of the molecular vibrations of the donor are presented. The low-temperature spectra provide exact fingerprints of the different phases as long they have different unit cells. Additional differences concerning the positions of ethylene groups reflect themselves in the CH2-stretching vibrations. As a result, it could be shown that the ethylene groups of the αt-phase and β-phase must have a different order. Concerning the tempering of the different phases,it is shown that at least αt- and χt- (BEDT-TTF)2I3 are the same.
ISSN:0379-6779
1879-3290
DOI:10.1016/0379-6779(93)90457-8