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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 22, Number 8
BKCSDE 22(8)
August 20, 2001 

 
Title
Electronic Absorption and Raman Spectroscopic Studies of α,ω-Diphenylpolyenyl Anions with Odd Number of Polyene Carbons
Author
Jin-Yeol Kim, Eung-Ryul Kim, Jaebum Choo, Akira Sakamoto, Mitsuo Tasumi
Keywords
Soliton, a, w-Diphenylpolyenyl aminos, Raman spectroscopy.
Abstract
The electronic absorption and Raman spectra of α,ω-diphenylpolyenyl anions Ph(CH)nPh- (DPn- , n = 3, 5, 7, 9, and 13), with odd number of carbons at the polyene part, have been studied in the tetrahydrofuran (THF) solutions and in their solid film states, respectively. In the case of Raman spectra for DPn- , the frequencies and relative intensities of some Raman peaks regularly change with the increase of polyene chain length. The spectral patterns of anions (DPn- ) are very similar with those of radical anion (DPnㆍ- ). However, the C=C stretching peaks of DPn- anions are observed in the 25-35 cm-1 higher frequency region than those of DPnㆍ- radical anions. In the case of long chain models such as DP9- and DP13- , the C=C stretching peaks are observed in even higher frequency region than those of the corresponding neutral polyenes such as DP8, DP10, and DP12. The Raman patterns of DPn- anions in the THF solutions are similar with those in their solid film states. On the other hand, their electronic absorption spectra show a considerable difference each other. The n- π* electronic absorption bands of DPn- anions in the THF solutions have been observed in the 0.27-0.39 eV lower energy region than those in their solid film states due to the solvent effects on polyene anions.
Page
837 - 841
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