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Russian Journal of Physical Chemistry A

, Volume 93, Issue 6, pp 1195–1203 | Cite as

Photochemical Reactions of Aminoazobenzene in Solutions, According to Ultrafast Vis Spectroscopy Data

  • Yu. A. MikheevEmail author
  • Yu. A. Ershov
PHOTOCHEMISTRY AND MAGNETOCHEMISTRY
  • 4 Downloads

Abstract

Photoinduced processes (photonics) in trans-aminoazobenzene (t-AAB) are determined by analyzing literature data on transient Vis spectra upon pulsed laser excitation at λex = 400 nm. The analysis is based on the concepts of the rydimer structure of aminoazobenzene dyes, particularly t-AAB2 (the ground state of the dye). It is shown that the photochemical emergence and subsequent transformation of the transient spectra, along with the isomerization of t-AAB2 to cis-aminoazobenzene (c-AAB), are caused by simultaneous events of the splitting of t-AAB2 rydimers into monomers; the splitting of the rydimers is induced by the absorption of visible light by cations of the phenylaminyl type (chromogens of t-AAB2 rydimers). The mechanism of the process is described, which includes the formation of two types of Franck–Condon monomer pairs of t-AAB. As is shown, a pair of one type consists of two identical monomers; it relaxes into the initial t-AAB2 rydimer. A pair of the other type contains one monomer t-AAB and a doubly charged monomer with two cations of the phenylaminyl type and the absorption of visible light in the 500–750 nm range of wavelengths; the monomer dication isomerizes into c-AAB. Structural formulas of the transient electronic configurations are given that explain the photonics of t-AAB2 rydimers.

Keywords:

aminoazobenzene rydimers cations of phenylaminyl type photosplitting of rydimers transcis isomerization pulsed laser spectroscopy transient Vis spectra 

Notes

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Copyright information

© Pleiades Publishing, Ltd. 2019

Authors and Affiliations

  1. 1.Emanuel Institute of Biochemical Physics, Russian Academy of SciencesMoscowRussia
  2. 2.Bauman Moscow State Technical UniversityMoscowRussia

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