FT-IR and FT-Raman studies of 13C- and 34S-labeled bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF or ET) electron-donor molecules were made, and the results are presented. Assignments for fundamental vibrations in ET were verified. Spectral data suggest that ET has no center of symmetry (confirming X-ray data) and that the data can be reconciled by a D-type point group with only slight interactions occurring between the four molecules per unit cell.
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