Photochemistry of tris(2,3,5,6-tetrathiaaryl)methyl radicals in various solutions

Andrey A. Kuzhelev, Victor M. Tormyshev, Victor F. Plyusnin, Olga Yu Rogozhnikova, Mariya V. Edeleva, Sergey L. Veber, Elena G. Bagryanskaya

Research output: Contribution to journalArticlepeer-review

Abstract

During the last decades, persistent tris(2,3,5,6-tetrathiaaryl)methyl radicals (TAMs) have attracted much attention due to their applications in oximetry, EPR tomography, and as spin labels in pulsed dipolar EPR spectroscopy. Recently, researchers proposed to use TAM radicals as spin labels and/or a partner for photoinduced spin labels. Thus, the questions of their photochemical stability and mechanism of degradation under UV irradiation have become relevant and important. In this study, steady-state photolysis and flash photolysis of TAM radicals were investigated. A detailed mechanism of TAM phototransformations was proposed and confirmed by NMR, gel permeation chromatography, and mass-spectrometric analyses of the products.

Original languageEnglish
Pages (from-to)1019-1026
Number of pages8
JournalPhysical Chemistry Chemical Physics
Volume22
Issue number3
DOIs
Publication statusPublished - 21 Jan 2020

Keywords

  • NANOMETER DISTANCE MEASUREMENTS
  • ELECTRON-SPIN RELAXATION
  • TRITYL RADICALS
  • TRIARYLMETHYL RADICALS
  • DIPOLAR SPECTROSCOPY
  • TRIPLET-STATE
  • EPR
  • LABELS
  • OXYGEN
  • POLARIZATION

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