Absorption and fluorescent spectral studies of imidazophenazine derivatives

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
O A RyazanovaS G Stepanian

Abstract

Absorption and fluorescent spectra as well as fluorescence polarization degree of imidazo-[4,5-d]-phenazine (F1) and its two modified derivatives, 2-trifluoridemethylimidazo-[4,5-d]-phenazine (F2) and 1,2,3-triazole-[4,5-d]-phenazine (F3), were investigated in organic solvents of various polarities and hydrogen bonding abilities. Extinction coefficients of F2 and F3 are increased, their fluorescence Stokes shifts are reduced in comparison with those for unmodified imidazophenazine. For F3 a red shift of the longwave absorption band is observed by 15-20 nm. Modifications of imidazophenazine have led to a sufficient increase of fluorescence polarization degrees that enables to use F2 and F3 as promising fluorescent probes with polarization method application. The configuration, atomic charge distribution and dipole moments of the isolated dye molecules in the ground state were calculated by the DFT method. The computation has revealed that ground state dipole moments of F1, F2, and F3 differ slightly and are equal to 3.5, 3.2, and 3.7D, respectively. The changes in dipole moments upon the optical excitation for all derivatives estimated using Lippert equation were found to be Deltamu = 9 D. The energies of the electronic S1<--S0 ...Continue Reading

Citations

Oct 15, 2013·Luminescence : the Journal of Biological and Chemical Luminescence·Mi TianCanCheng Guo
Jul 29, 2006·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·O A RyazanovaV A Karachevtsev
Nov 20, 2015·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Eugene ZarudnevVictor Karachevtsev
Dec 31, 2005·Journal of Mass Spectrometry : JMS·Marina V KosevichLudwik Adamowicz
Jul 8, 2017·Journal of Fluorescence·Munendra Pal Singh, Jubaraj B Baruah

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