Frontiers in Chemistry (Nov 2021)

Migration of Excitation Energy in Furocoumarins

  • O.N. Tchaikovskaya,
  • O.N. Tchaikovskaya,
  • N.G. Dmitrieva,
  • N.G. Dmitrieva,
  • E.N. Bocharnikova,
  • V.S. Chaidonova,
  • V.S. Chaidonova,
  • P.V. Avramov

DOI
https://doi.org/10.3389/fchem.2021.754950
Journal volume & issue
Vol. 9

Abstract

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The migration of excitation energy of a number of psoralen compounds has been studied. For this, the methods of induced absorption spectroscopy, stationary electron spectroscopy, fluorescence and phosphorescence, as well as quantum chemistry were used. A comparative photostability of psoralen was achieved by exposure to a XeCl excilamp irradiation (emission wavelength λem = 308 nm) with parameters Δλ = 5–10 nm, Wpeak = 18 mW/cm2, p = 8.1 J/cm3, f = 200 kHz, pulse duration 1 μs. It was found that the singlet-triplet transition played a major role in the migration of excitation energy into triplet states. Among all tested compounds, substances with an OCH3-group in the structure have the strongest effect on the spectral-luminescent characteristics.

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