Two phases of trans -stilbene in a polystyrene matrix.

Autor:	Karpicz R; Center for Physical Sciences and Technology, Saulėtekio av. 3, Vilnius, Lithuania., Kareivaite G; Center for Physical Sciences and Technology, Saulėtekio av. 3, Vilnius, Lithuania., Macernis M; Institute of Chemical Physics, Faculty of Physics, Vilnius University, Saulėtekio av. 3, Vilnius, Lithuania. mindaugas.macernis@ff.vu.lt., Abramavicius D; Institute of Chemical Physics, Faculty of Physics, Vilnius University, Saulėtekio av. 3, Vilnius, Lithuania. mindaugas.macernis@ff.vu.lt., Valkunas L; Center for Physical Sciences and Technology, Saulėtekio av. 3, Vilnius, Lithuania.; Institute of Chemical Physics, Faculty of Physics, Vilnius University, Saulėtekio av. 3, Vilnius, Lithuania. mindaugas.macernis@ff.vu.lt.
Jazyk:	angličtina
Zdroj:	Physical chemistry chemical physics : PCCP [Phys Chem Chem Phys] 2023 Aug 16; Vol. 25 (32), pp. 21183-21190. Date of Electronic Publication: 2023 Aug 16.
DOI:	10.1039/d3cp03015f
Abstrakt:	Variability in the spectral properties of solid conformations of stilbene under various external conditions still remains obscure. The photophysical properties of trans -stilbene solution in solid polystyrene glass have been studied by absorption and time-resolved fluorescence. Concentration-induced quenching has been observed for small concentrations of stilbene. At large concentrations, the spectroscopic characteristics become split between the two phases of the sample: single-molecule properties are responsible for absorption, while the micro-crystalline phase dominates in fluorescence. Ab initio and molecular dynamics analyses suggest permanent twisting of the stilbene molecular structure upon crystallization, which supports spectroscopic phase separation.
Databáze:	MEDLINE
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