Variable-temperature absorption and emission properties of 1,2-diphenylacetylene and 1,4-diphenylbuta-1,3-diyne derivatives
Małgorzata Szyszkowska , Irena Bylińska , Wiesław Wiczk
AbstractVariable-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.
|Other language title versions|
|Journal series||Journal of Photochemistry and Photobiology A-Chemistry, ISSN 1010-6030|
|Publication size in sheets||0.5|
|Keywords in English||diphenylacetylenes, diphenylbuta-1,3-diynes, absorption, fluorescence spectra, fluorescence quantum yield, temperature measurements, activation energy, excited state, conformational changes|
|Score|| = 25.0, 20-12-2017, ArticleFromJournal|
= 25.0, 20-12-2017, ArticleFromJournal
|Publication indicators||: 2016 = 2.625 (2) - 2016=2.493 (5)|
|Citation count*||2 (2018-04-26)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.