Variable-temperature absorption and emission properties of 1,2-diphenylacetylene and 1,4-diphenylbuta-1,3-diyne derivatives

Małgorzata Szyszkowska , Irena Bylińska , Wiesław Wiczk

Abstract

Variable-temperature absorption and emission data over the range 80–300 K have been collected for 1,2-diphenylacetylene (DPA) and its derivatives, as well as 1,4-diphenylbuta-1,3-diyne (DPB) derivatives in 2-methyltetrahydrofuran (2-MeTHF). Moreover, the influence of temperature on fluorescence lifetime and quantum yield has also been investigated. A strong coupling between solvation dynamics and solute structure is observed in the low-temperature regime as well as at intermediate temperature where the structure of the compound is evolving in the course of excited-state relaxation. Moreover, the dependency of fluorescence quantum yield on temperature indicates that the energy of activation of radiationless transition for 1,2-diphenylacetylene and its derivatives is larger than the activation energy of viscous flow of 2-MeTHF, while for 1,4-diphenylbuta-1,3-diyne derivatives the opposite is observed. This finding implies that the conformational change of DPA and its derivatives in the excited state in 2-MeTHF shows an activation energy, contrary to DPB and its derivatives for which conformational changes are barrierless.
Author Małgorzata Szyszkowska PFotobiofizyki
Małgorzata Szyszkowska,,
- Laboratory of Photobiophysics
, Irena Bylińska PFotobiofizyki
Irena Bylińska,,
- Laboratory of Photobiophysics
, Wiesław Wiczk PFotobiofizyki
Wiesław Wiczk,,
- Laboratory of Photobiophysics
Other language title versions
Journal seriesJournal of Photochemistry and Photobiology A-Chemistry, ISSN 1010-6030
Issue year2017
Vol348
Pages47-56
Publication size in sheets0.5
Keywords in Englishdiphenylacetylenes, diphenylbuta-1,3-diynes, absorption, fluorescence spectra, fluorescence quantum yield, temperature measurements, activation energy, excited state, conformational changes
DOIDOI:10.1016/j.jphotochem.2017.08.012
URL http://https://doi.org/10.1016/j.jphotochem.2017.08.012
Languageen angielski
Score (nominal)25
ScoreMinisterial score = 25.0, 20-12-2017, ArticleFromJournal
Ministerial score (2013-2016) = 25.0, 20-12-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 2.625 (2) - 2016=2.493 (5)
Citation count*2 (2018-08-19)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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