Ultrafast photoinduced relaxation dynamics of the indoline dye D149 in organic solvents

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dc.identifier.uri http://dx.doi.org/10.15488/2216
dc.identifier.uri http://www.repo.uni-hannover.de/handle/123456789/2241
dc.contributor.author Lohse, Peter W.
dc.contributor.author Kuhnt, Julia
dc.contributor.author Druzhinin, Sergey I.
dc.contributor.author Scholz, Mirko
dc.contributor.author Ekimova, Maria
dc.contributor.author Oekermann, Torsten
dc.contributor.author Lenzer, Thomas
dc.contributor.author Oum, Kawon
dc.date.accessioned 2017-11-01T13:25:07Z
dc.date.available 2017-11-01T13:25:07Z
dc.date.issued 2011
dc.identifier.citation Lohse, P.W.; Kuhnt, J.; Druzhinin, S.I.; Scholz, M.; Ekimova, M. et al.: Ultrafast photoinduced relaxation dynamics of the indoline dye D149 in organic solvents. In: Physical Chemistry Chemical Physics 13 (2011), Nr. 43, S. 19632-19640. DOI: https://doi.org/10.1039/c1cp22429h
dc.description.abstract The relaxation dynamics of the indoline dye D149, a well-known sensitizer for photoelectrochemical solar cells, have been extensively characterized in various organic solvents by combining results from ultrafast pump–supercontinuum probe (PSCP) spectroscopy, transient UV-pump VIS-probe spectroscopy, time-correlated single-photon counting (TCSPC) measurements as well as steady-state absorption and fluorescence. In the steady-state spectra, the position of the absorption maximum shows only a weak solvent dependence, whereas the fluorescence Stokes shift Δ[small nu, Greek, tilde]F correlates with solvent polarity. Photoexcitation at around 480 nm provides access to the S1 state of D149 which exhibits solvation dynamics on characteristic timescales, as monitored by a red-shift of the stimulated emission and spectral development of the excited-state absorption in the transient PSCP spectra. In all cases, the spectral dynamics can be modeled by a global kinetic analysis using a time-dependent S1spectrum. The lifetime τ1 of the S1 state roughly correlates with polarity [acetonitrile (280 ps) < acetone (540 ps) < THF (720 ps) < chloroform (800 ps)], yet in alcohols it is much shorter [methanol (99 ps) < ethanol (178 ps) < acetonitrile (280 ps)], suggesting an appreciable influence of hydrogen bonding on the dynamics. A minor component with a characteristic time constant in the range 19–30 ps, readily observed in the PSCP spectra of D149 in acetonitrile and THF, is likely due to removal of vibrational excess energy from the S1 state by collisions with solvent molecules. Additional weak fluorescence in the range 390–500 nm is observed upon excitation in the S0 → S2 band, which contains short-lived S2 → S0 emission of D149. Transient absorption signals after excitation at 377.5 nm yield an additional time constant in the subpicosecond range, representing the lifetime of the S2 state. S2 excitation also produces photoproducts. eng
dc.language.iso eng
dc.publisher Cambridge : Royal Society of Chemistry
dc.relation.ispartofseries Physical Chemistry Chemical Physics 13 (2011), Nr. 43
dc.rights Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden. Dieser Beitrag ist aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
dc.subject spectroscopy eng
dc.subject time-correlated single-photon counting (TCSPC) eng
dc.subject Pump–supercontinuum probe (PSCP) eng
dc.subject.ddc 540 | Chemie ger
dc.title Ultrafast photoinduced relaxation dynamics of the indoline dye D149 in organic solvents eng
dc.type article
dc.type Text
dc.relation.issn 1463-9076
dc.relation.doi https://doi.org/10.1039/c1cp22429h
dc.bibliographicCitation.issue 43
dc.bibliographicCitation.volume 13
dc.bibliographicCitation.firstPage 19632
dc.bibliographicCitation.lastPage 19640
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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