Spectral studies of highly conducting organic composites (BEDO-TTF)x/iodine

Multiphase Structure of Highly Conducting Organic Composites (BEDO-TTF)x/Iodine

“…Therefore, a granular structure is also expected for (BEDO-TTF) x /I composites. IR absorption spectra of (BEDO-TTF) x /I composites have been recently studied [9]. It was found that the spectra are typical for conducting BEDO-TTF materials.…”

“…Most of the observed bands were assigned to normal vibrations of the BEDO-TTF + cation. The totally symmetric modes (A g ) are coupled to the electron excitations and appear as strong and shifted bands in the IR spectrum [9]. In this paper, we focus on the evolution of the spectra effected by changes in the proportion x between BEDO-TTF and iodine components.…”

“…2 for different sample compositions x. The spectra consist of three main bands at 1159, 1170, and 1179 cm --1 (indicated by the arrows), attributed to the stretching vibrations of C-O bonds (some features could be due to the bending vibrations of C=C-H groups) [9,14]. The band at 1159 cm --1 is attributed to the stretching vibrations of the C-O and/or the bending of the C=C-H groups of the BEDO-TTF species; the bands at 1170 and 1179 cm --1 , however, are assigned to the C-O stretching vibrations.…”

“…Such a method has been employed for the preparation of highly conducting composites of bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) with e.g. iodine, AuI, AuI 3 , or AuBr 3 [2][3][4][5][6][7] and bis(ethylenedioxy)tetrathiafulvalene (BEDO-TTF) with iodine [8,9]. The main advantage of this method is the unlimited size of the composite samples.…”

“…Another unique feature of these organic metals is their excessive content of BEDO-TTF which allows for a partial CT ground state in the complexes with strong acceptor molecules [13]. This is the reason why the properties of BEDO-TTF crystalline metals and their composites are unusual [8,9]. Large intermolecular interactions in the BEDO-TTF composites are realized by sterically allowed close contacts of inner sulfur atoms of maximum HOMO coefficients, and the metallic state is more easily stabilized in BEDO-TTF complexes.…”