Franck-Condon analysis of the absorption and fluorescence spectra of all trans α,ω-diphenylpolyenes with one to seven polyene double bonds

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  • Franck-Condon analysis of the absorption and fluorescence spectra of all <i>trans</i> α,ω-diphenylpolyenes with one to seven polyene double bonds

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<jats:p>Fluorescence and absorption spectra have been measured for all-trans α,ω-diphenylpolyenes with one to seven polyene double bonds in room-temperature solution, along with the fluorescence spectra of those with one to six polyene double bonds in n-alkane matrices at 77 K. All the spectral data were fitted by sums of Gaussians to treat the Franck-Condon envelopes of the measured spectra quantitatively. The Franck-Condon analyses of the spectra in the harmonic limit revealed that the displacements of the CC and C–C stretching vibrational modes in the 2 Ag state relative to those in the ground state, 1Ag1(S0), increase, while those in the 1Bu1 state show a slight decrease with the increase of the polyene chain length. It is also shown that the bandwidths of the absorption and fluorescence spectra exhibit a monotonic decrease with the increase of the chain length.</jats:p>

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