2026-03-13T07:20:16Z https://hiroshima.repo.nii.ac.jp/oai

oai:hiroshima.repo.nii.ac.jp:02007259 2025-02-21T09:34:50Z 1730444907710

Solvent-polarizability dependence of the relative 2 1Ag(S1)- and 1 1Bu(S2)-fluorescence intensities of 1,14-diphenyl-1,3,5,7,9,11,13-tetradecaheptaene Itoh, Takao Itoh Takao open access Copyright (c) 2003 American Institute of Physics 420 Emission, excitation, and absorption spectra of diphenyltetradecaheptaene (DP7) have been measured in solvents with different polarizabilities, together with the Raman spectrum at room temperature. DP7 exhibits dual fluorescence from the 2 1Ag(S1) and 1 1Bu(S2) states in room temperature solution. It is shown that the 2 1Ag/1 1Bu fluorescence intensity-ratio varies significantly depending on the solvent polarizability. This observation was interpreted on the basis of the coupling strength between the 2 1Ag/1 1Bu states which is determined mainly by the 2 1Ag–1 1Bu energy separation. Fitting of the spectra with sum of Gaussians reveals a significant difference in Franck–Condon envelop between the 2 1Ag and 1 1Bu fluorescence spectra, which is originating from the large difference in the C–C and C[Double Bond]C stretching mode displacements between the 2 1Ag and 1 1Bu states. American Institute of Physics 2003-08-22 eng journal article VoR https://hiroshima.repo.nii.ac.jp/records/2007259 10.1063/1.1591172 http://dx.doi.org/10.1063/1.1591172 AA00694991 0021-9606 Journal of Chemical Physics Journal of Chemical Physics 119 8 4516 4516 4521 https://hiroshima.repo.nii.ac.jp/record/2007259/files/JCP_119_4516.pdf 96.4 KB