Skip to Main content Skip to Navigation
Journal articles

The effect of protonation on the excited state dynamics of pyrimidine chromophores

Abstract : The effect of protonation on the photophysics and especially on the excited state dynamics of two pyrimidine chromophores, bearing the A-(π-D)2 and A-(π-D)3 structure, is studied by means of fs-ps and ns time resolved fluorescence spectroscopy. Three different acids, namely camphorsulphonic (CSA), acetic (AcOH) and trifluoroacetic acid (TFA) were used. The chromophores bear the pyrimidine electron deficient heterocycle as electron-withdrawing group, used as protonation site, as well as diphenylamino electron donors. Protonation is revealed through the emergence of red-shifted absorption and fluorescence bands accompanied by a quenching of the fluorescence of the neutral molecules. Time-resolved dynamics reveal that protonation with CSA and TFA do not influence the excited state lifetime of the chromophores, pointing to a static quenching process. On the other hand, the lifetime is decreased upon protonation with AcOH. Further investigation based on the Stern-Volmer plots showed that addition of AcOH leads to both dynamic and static quenching.
Document type :
Journal articles
Complete list of metadatas

Cited literature [79 references]  Display  Hide  Download

https://hal-univ-rennes1.archives-ouvertes.fr/hal-02472929
Contributor : Laurent Jonchère <>
Submitted on : Monday, February 17, 2020 - 2:41:16 PM
Last modification on : Monday, February 17, 2020 - 2:51:07 PM
Long-term archiving on: : Monday, May 18, 2020 - 4:31:04 PM

File

Kournoutas et al-2020-The effe...
Files produced by the author(s)

Identifiers

Citation

F. Kournoutas, I.K. Kalis, M. Fecková, S. Achelle, M. Fakis. The effect of protonation on the excited state dynamics of pyrimidine chromophores. Journal of Photochemistry and Photobiology A: Chemistry, Elsevier, 2020, 391, pp.112398. ⟨10.1016/j.jphotochem.2020.112398⟩. ⟨hal-02472929⟩

Share

Metrics

Record views

94

Files downloads

33