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Resonance Raman spectroscopic studies on the conducting state of polyvinylcarbazole and its model compounds
Author(s) -
Anandhi R.,
Umapathy S.
Publication year - 1998
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/(sici)1097-4555(199810/11)29:10/11<901::aid-jrs326>3.0.co;2-5
Subject(s) - dimer , raman spectroscopy , radical ion , chemistry , monomer , resonance raman spectroscopy , photochemistry , resonance (particle physics) , radical , carbazole , polymer , ion , organic chemistry , atomic physics , physics , optics
The conductivity in polyvinylcarbazole (PCVz), a well knownphotoconducting polymer, has been attributed to the migration of thecation radicals along the chain. In this paper, chemically generatedmonomer and dimer radical cations of the carbazolyl group and theconducting form of PVCz have been investigated by resonance Raman (RR)spectroscopy. Vibrational assignments are presented for the observedfrequencies by comparison with similar compounds and also by densityfunctional theoretical calculations. The structure of the monomer anddimer radical cations have been inferred from the RR spectra. It hasbeen observed that Raman bands of the radical cation of PVCz in whichthe charge is localized on the dimer, undergo a downshift compared tothat of N‐ethylcarbazole (NEC) dimer radical cation. This shift hasbeen tentatively attributed to the interaction of the PVCz dimerradical cation with the neutral carbazole which may be facilitated bythe conformational rearrangement required for the exchange of chargewith neutral carbazole. © 1998 John Wiley & Sons,Ltd.