Effect of deuteration on the electronic and electron-vibrational properties of the organic conductor k-(D8-BEDT-TTF)2[Hg(SCN)2Br] |
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Authors: | R M Vlasova O O Drozdova V N Semkin R N Lyubovskaya |
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Institution: | (1) A. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia;(2) Institute of Chemical Physics, Russian Academy of Sciences, 142432 Chernogolovka, Moscow Region, Russia |
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Abstract: | We present here for the first time polarized reflection spectra and optical conductivity spectra of single crystals of the
newly deuterated organic conductor k-(D8-BEDT-TTF)2Hg(SCN)2Br] at room temperature. The spectral region investigated is 700–40 000 cm−1. We examined the effect of deuteration on electronic and electron-vibrational transitions observed in the spectra. The observed
shift of the electron “dimer” transition in the infrared toward lower frequencies upon deuteration is linked with an increase
in the interaction between neighboring, mutually perpendicular dimers in the structure of the deuterated crystal. A lowering
of the symmetry of the BEDT-TTF molecule is demonstrated in crystals similar to k-(BEDT-TTF)2Hg(SCN)2Br], relative to the symmetry D
2h
of the free molecule. We refine the assignment of the spectral features determined by the interaction of electrons with the
fully-symmetric intramolecular vibrations of the C=C, C-S, and C-C-H bonds of the BEDT-TTF molecule.
Fiz. Tverd. Tela (St. Petersburg) 40, 1595–1598 (September 1998) |
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