The origin of the solvent dependence of fluorescence quantum yields in dipolar merocyanine dyes
Zitieren Sie bitte immer diese URN: urn:nbn:de:bvb:20-opus-198707
- Fluorophores with high quantum yields are desired for a variety of applications. Optimization of promising chromophores requires an understanding of the non-radiative decay channels that compete with the emission of photons. We synthesized a new derivative of the famous laser dye 4-dicyanomethylen-2-methyl-6-p-dimethylaminostyryl-4H-pyran (DCM),i.e., merocyanine 4-(dicyanomethylene)-2-tert-butyl-6-[3-(3-butyl-benzothiazol-2-ylidene)1-propenyl]-4H-pyran (DCBT). We measured fluorescence lifetimes and quantum yields in a variety of solventsFluorophores with high quantum yields are desired for a variety of applications. Optimization of promising chromophores requires an understanding of the non-radiative decay channels that compete with the emission of photons. We synthesized a new derivative of the famous laser dye 4-dicyanomethylen-2-methyl-6-p-dimethylaminostyryl-4H-pyran (DCM),i.e., merocyanine 4-(dicyanomethylene)-2-tert-butyl-6-[3-(3-butyl-benzothiazol-2-ylidene)1-propenyl]-4H-pyran (DCBT). We measured fluorescence lifetimes and quantum yields in a variety of solvents and found a trend opposite to the energy gap law.This motivated a theoretical investigation into the possible non-radiative decay channels. We propose that a barrier to a conical intersection exists that is very sensitive to the solvent polarity. The conical intersection is characterized by a twisted geometry which allows a subsequent photoisomerization. Transient absorption measurements confirmed the formation of a photoisomer in unpolar solvents, while the measurements of fluorescence quantum yields at low temperature demonstrated the existence of an activation energy barrier.…
Autor(en): | Joscha Hoche, Alexander Schulz, Lysanne Monika Dietrich, Alexander Humeniuk, Matthias Stolte, David Schmidt, Tobias Brixner, Frank WürthnerORCiDGND, Roland Mitric |
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URN: | urn:nbn:de:bvb:20-opus-198707 |
Dokumentart: | Artikel / Aufsatz in einer Zeitschrift |
Institute der Universität: | Fakultät für Chemie und Pharmazie / Institut für Physikalische und Theoretische Chemie |
Sprache der Veröffentlichung: | Englisch |
Titel des übergeordneten Werkes / der Zeitschrift (Englisch): | Chemical Science |
Erscheinungsjahr: | 2019 |
Band / Jahrgang: | 10 |
Seitenangabe: | 11013 |
Originalveröffentlichung / Quelle: | Chemical Science, 2019,10, 11013-11022. https://doi.org/10.1039/C9SC05012D |
URL der Erstveröffentlichung: | https://doi.org/10.1039/C9SC05012D |
Allgemeine fachliche Zuordnung (DDC-Klassifikation): | 5 Naturwissenschaften und Mathematik / 54 Chemie / 541 Physikalische Chemie |
Freie Schlagwort(e): | solvent-dependent fluorescence yield |
Datum der Freischaltung: | 28.01.2020 |
EU-Projektnummer / Contract (GA) number: | 646737 |
OpenAIRE: | OpenAIRE |
Lizenz (Deutsch): | CC BY: Creative-Commons-Lizenz: Namensnennung |