The electronic spectra of .ALPHA.,.OMEGA.-di-1- and .ALPHA.,.OMEGA.-di-2-naphthylpolyenes in solution and in solid state.

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概要

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• The electronic absorption spectra of α,ω-di-1- and α,ω-di-2-naphthylpolyenes have been studied in solution and in the crystalline state. Both polyenes have four distinct electronic band systems. The spectral properties indicate that the terminal naphthyl group reduces the symmetry of the short-chained polyene molecules whereas long naphthylpolyenes retain the usual conjugated polyene symmetry of C<SUB>2h</SUB>. A plot of λ<SUB>max</SUB><SUP>2</SUP>-<I>n</I> gives a straight line and a nearly <I>all-trans</I> form seems to be retained by the polyene chain. Unlike that in some conjugated polyenes a good overlap between the first absorption band and the highest energy emission band is observed. This suggests that there is no low-lying forbidden state in these polyenes. Some of the absorption bands of naphthylpolyene crystal could be explained in terms of factor group split components. Two extra bands observed in α,ω-di-2-naphthylpolyenes seem to be related to naphthalene transitions.

• 公益社団法人 日本化学会の論文

著者

• Mandal Krishnagopal

  Department of Physics, North Bengal University

• Misra T.

  Department of Physics, North Bengal University

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