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1 2009

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Optical study of ß”-(bis(ethylenedithio)tetrathiafulvalene)2SF5CH2SO3 Activation of intramolecular modes

Olejniczak I., Barszcz B., Graja A., Schlueter J. A.

Materials Science Poland

2009

Vol. 27, No. 3

621--627

We report on the temperature dependences of polarized reflectance spectra of ß”-(bis(ethylenedithio) tetrathiafulvalene)2SF5CH2SO3. The material remains in the charge-ordered state over the whole temperature range. Room temperature infrared spectra display the response characteristic of a quasi-twodimensional organic conductor, with a broad mid-infrared electronic excitation and a number of vibrational features related to intramolecular modes of both the bis(ethylenedithio)tetrathiafulvalene (ET) donor molecule and the SF5CH2SO3 anion. Upon lowering the temperature, unusual activation of intramolecular modes of ET is observed. We suggest that this effect is connected with electronmolecular vibration coupling within a dimerized lattice.