Evaluation of parameters of intramolecular interaction from absorption and fluorescence spectra of substituted arylpolyene with poor resolved vibrational structure

Isotopic effects in impurityvacancy complexes in diamond

“…This is a natural assumption when one is dealing with allowed electronic transitions, which is the case for the GeV center. However, in previous studies [13,14], there is a tendency to consider the next term in the decomposition of the electronic dipole moment on the coordinates of impurity atom (the Herzberg-Teller effect) as an additional free parameter of the model that also might explain asymmetry in the luminescence and the absorption sidebands. Remarkably, the isotopic shifts also provide a means for experimental evaluation of the relative amplitude of the Franck-Condon and Herzberg-Teller effects (see Fig.…”

Analysis of the parameters of Franck–Condon and Herzberg–Teller interactions the molecules of substituted diphenylbutadienes

“…In particular a lot of information about intramolecular interactions can be obtained by joint analysis of absorption and luminescence electronic-vibrational spectra of organic compounds. [5][6][7][8] In the majority works, which devoted to the spectra of substituted polyenes with trans-configuration, for the same substituted compounds there is considerable overlap between the general characteristic vibrational bands locations and these interpretations.It is known that the substituents in the para position (in this study -nitro and amino groups) irrespective of their electronic nature violate uniform distribution of electron density in the molecule of DPB [9]. It should affect by the quantification of intramolecular interactions.…”

“…Therefore, it was interest to produce comparative analysis of the spectral properties and quantification of the contribution of intramolecular interactions in the formation of the fine-structure spectra. The relative intensities of bands in the spectra of were calculated by the procedure described in [7,8]. Based on the modern theory of molecular spectra in the adiabatic approximation ,which makes it possible to simultaneously take into account the influence of the Franck-Condon and Herzberg-Teller interactions on the shape of optical bands [10], we calculated the parameters а and α (of the FC and HT interactions, respectively) for each vibronic transition of the studied molecules.…”

“…In particular a lot of information about intramolecular interactions can be obtained by joint analysis of absorption and luminescence electronic-vibrational spectra of organic compounds. [5][6][7][8] In the majority works, which devoted to the spectra of substituted polyenes with trans-configuration, for the same substituted compounds there is considerable overlap between the general characteristic vibrational bands locations and these interpretations.…”

Analysis of vibronic interactions in the molecules of cross-conjugated ketones

“…Therefore, it was interest to produce the comparative analysis of the spectral properties of ketones and diphenylpolyenes at the same time, and quantification of the contribution of intramolecular interactions in the organization of the fine-structure spectra of these molecules. In order to realize such kind if investigations the different methods of selective laser spectroscopy can be used [2,3], in particular vibrational analysis of conjugated absorption and luminescence spectra [4][5][6][7].In this study, the basic osciliation for ketones with general formula R1,2=Ph-CO-R1 (where R1o(CH=CH)2-N(CH3)2, R2oCH3-NC4H3-CH, Pho(HOC6H6)) were correlated with the interpretation of similar value and substituent frequencies 1,4-diphenylbutadiene with the substituent on the ring N(CH3)2 and NO2, respectively (after -DFB3), which spectral properties have been studied previously [8][9][10]. We shown how band intensities ketones characterizing polyene bridge and the phenyl ring are changes.…”