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

TITLE=Migration of Excitation Energy in Furocoumarins

JOURNAL=Frontiers in Chemistry

VOLUME=9

YEAR=2021

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2021.754950

DOI=10.3389/fchem.2021.754950

ISSN=2296-2646

ABSTRACT=<p>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 λ<sub>em</sub> = 308 nm) with parameters Δλ = 5–10 nm, W<sub>peak</sub> = 18 mW/cm<sup>2</sup>, <italic>p</italic> = 8.1 J/cm<sup>3</sup>, 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 OCH<sub>3</sub>-group in the structure have the strongest effect on the spectral-luminescent characteristics.</p>