The Reflection Spectra of the New Organic Conductor (BEDT-TTF)4Hg3Cl8

Abstract

Polarised reflectivity spectra at room temperature in the region 200 to 25000 cm−1 are investigated for quasi‐two‐dimensional conductor (ET)4Hg3Cl8 single crystals. The optical properties of this compound are almost isotropic in the plane parallel to conducting layers. In the reflection spectra, the electronic band with metal‐like edge and the electron‐vibrational bands are observed. The spectra are satisfactorily described by the phase phonon model including electron damping and the dependence of molecular vibrational frequencies on the molecular charge.

Electrochemical Properties and Absorption Spectra of Conducting Films of Tetrathyotetracene Iodids

“…One may suppose the formation of conducting salts of the composition TTT-Ix , similar to the previously observed in the films doped from the gas phase [3,4]. The formation of TTT-IX salts is confirmed by the IR spectroscopy data.…”

“…The formation of TTT-IX salts is confirmed by the IR spectroscopy data. The appearance of wide bands in the region of 1000-1400 cm -1 typical for conducting TTT salts [3][4][5] in the spectra of electrochemically treated films is an evidence of generation of such salts in the material of the film. Different iodine contents in the films prepared at different potentials may be seen from different intensities of the two components of 1600 cm -1 band which is a characteristic of the composition of TTT-I X salts [3,5].…”

“…In our previous works, we reported the investigation of spectral and electrical properties of tetrathyotetracene (TTT) iodides films prepared by vacuum deposition of TTT followed by doping with iodine from the gas phase [3,4].…”

Electron-molecular vibration coupling in (DMtTTF)Br and (o-DMTTF)2[W6O19] salts studied by vibrational spectroscopy

“…More specifically, the dimer model has proven especially useful in determining the coupling constants for charge transfer materials containing TTF derivatives. For example, reliable values for the EMV constants were According to symmetry considerations, in linear approximation for non-degenerated molecular orbital only the totally symmetric vibrational modes can couple with electrons [6,[16][17]. For other symmetry modes, the electron-vibrational interaction is forbidden by the selection rules and is only correct if the molecules within the dimer have the same symmetry [16].…”

“…For example, reliable values for the EMV constants were According to symmetry considerations, in linear approximation for non-degenerated molecular orbital only the totally symmetric vibrational modes can couple with electrons [6,[16][17]. For other symmetry modes, the electron-vibrational interaction is forbidden by the selection rules and is only correct if the molecules within the dimer have the same symmetry [16]. When considering the dimer, where the molecules are asymmetric with respect to one another, if those molecules are different or inequivalent, their modes are no longer degenerate and couple both in-phase and out-of-phase.…”