7-AZAINDOLE IN THE VAPOR PHASE: ABSORPTION, LUMINESCENCE, AND THE MECHANISM OF LONG-LASTING LUMINESCENCE
Abstract
He absorption and luminescence spectra of 7-azaindole in vapors are measured. The absorption spectrum in the 240-300 nm region has a wide band, against which a sequence of vibrational maxima is observed. Two bands are observed in the luminescence spectrum, one of which relates to fast fluorescence with a maximum of λmаx=305 nm, the second band with λmаx = 520 nm refers to long-lasting luminescence. The fluorescence spectrum under excitation in the 0-0-transition region (λex = 289 nm) has a quasilinear structure. At other excitation wavelengths, the fluorescence spectrum is diffuse. The long-lasting luminescence in the microsecond time range is interpreted as the luminescence of free radicals formed due to the triplet-triplet annihilation. Excited states of free radicals are populated by nonradiative energy transfer from the triplet states of 7-azaindole to the doublet states of free radicals.
Keywords
7-азаиндол,
спектр поглощения,
флуоресценция,
аннигиляционная замедленная флуоресценция,
кинетика длительной люминесценции,
триплетное состояние,
свободные радикалы,
7-azaindole,
absorption spectra,
fluorescence,
annihilation delayed fluorescence,
kinetic of delayed luminescence,
triplet states,
free radicals
About the Author
A. A. Sukhodola
B. I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus
Russian Federation
Russian Federation
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Review
For citations:
Sukhodola A.A. 7-AZAINDOLE IN THE VAPOR PHASE: ABSORPTION, LUMINESCENCE, AND THE MECHANISM OF LONG-LASTING LUMINESCENCE. Zhurnal Prikladnoii Spektroskopii. 2018;85(5):745-751. (In Russ.)
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