RAMAN-SPECTRA OF HEAVILY SODIUM-DOPED TRANSPOLYACETYLENE AND THE RADICAL-ANIONS OF DIPHENYLPOLYENES AND DITHIENYLPOLYENES

Citation
Y. Furukawa et al., RAMAN-SPECTRA OF HEAVILY SODIUM-DOPED TRANSPOLYACETYLENE AND THE RADICAL-ANIONS OF DIPHENYLPOLYENES AND DITHIENYLPOLYENES, Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals, 256, 1994, pp. 721-726
Citations number
23
Categorie Soggetti
Crystallography
ISSN journal
1058725X
Volume
256
Year of publication
1994
Pages
721 - 726
Database
ISI
SICI code
1058-725X(1994)256:<721:ROHSTA>2.0.ZU;2-I
Abstract
The Raman spectra of trans-polyacetylene doped with sodium (Na) at the maximal level have been measured with excitation laser lines between 488.0 and 1064 nm. These spectra have been compared with those of mode l compounds, i.e., the radical anions of alpha, omega-diphenylpolyenes (Ph-(CH=CH)(n)-Ph, n = 3, 4) and alpha, omega-di-2-thienylpolyenes (T h-(CH=CH)(n)-Th, n = 3 and 4). The similarity between the Raman spectr a of Na-doped polyacetylene and those of the radical anions indicates that the observed bands of Na-doped polyacetylene arise from charged d omains generated by Na-doping. The observed large wavenumber dispersio n of the C=C stretching vibration of the charged domains suggests a br oad distribution of localization lengths in the charged domains.