The assignment of fundamental vibrations of BEDT-TTF and BEDT-TTF-d8

The i.r. and Raman spectra of bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) and BEDT-TTF-d8, are reported. All fundamental vibrations are assigned using the correlations between the data obtained and those for compounds containing BEDT-TTF fragments. A comparative normal coordinate analysis was done. The results can be used for calculation of the electron-intramolecular vibrational coupling constants of superconductive BEDT-TTF based charge-transfer complexes.