The fine structure fluorescence and fluorescence excitation spectra of conjugated chain com pounds, 1,4 distyrylbenzene (DSB) and its fluorine substituted derivative α,ω 1,4 distyrylbenzene, have been obtained by the Shpolskii method in an n octane matrix at a temperature of 4.2 K. These spectra have been simulated by representing the band of each of the vibronic transitions as the sum of a zero phonon line and a phonon wing with the corresponding parameters, such as the half widths of the spectral lines and the Debye-Waller factors. Based on this simulation, the relative intensities of vibronic transitions have been determined and the frequencies of normal vibrations in the S 0 and states have been refined. It has been found that the energy of the purely electronic transition in the molecule of the fluorine substituted derivative is higher by 950 cm -1 compared to the unsubstituted DSB. The parameters of the Franck-Condon and Herzberg-Teller interactions have been determined. The observed violation of the mirror symmetry between the conjugated spectra is explained by the interference of intramolecular interactions.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.