Resonant Raman scattering in single crystals of BDNT, BDNT1+ and BDNT2+

✍ Scribed by V.N. Denisov; A.N. Ivlev; B.N. Mavrin; K. Yakushi; J. Dong; Y. Yamashita

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 431 KB
• Volume: 246
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(95)01103-g

✦ Synopsis

Polarized Raman spectra of crystals of BDNT, BDNT-PFr, BDNT-(PFr) 2 and BDNT-(CIO4)2-CH2C12 have been obtained in the region 130-1700 cm-1. It is shown that due to a resonant character of the Raman spectra only the Ag modes of the intramolecular vibrations of the BDNT molecules were observed in the spectra of all the crystals. A low-frequency shift of the frequencies of the C=C bands on increasing the oxidation degree is revealed which is due to charge transfer from the BDNT molecules to the acceptors PF 6 or (C104) 2. This shift was larger for the band corresponding to the stretching vibration of the C=C bond which connected the dithiole and naphtho-thiadiazole rings. The Raman intensity of this band diminished strongly with the growth of oxidation, likely due to frustration of the bond conjugation. A molecular configuration in the crystals depends on the oxidation degree, but not on the acceptor type.