highlight 3 2024

We are investigating the photoacidity of a boron-based dye (B). The electronic absorption spectrum of B in an aqueous buffer shows that the lowest-energy band of the protonated species (HB+) is blue-shifted relative to that of the non-protonated species (B). The emission spectrum does not change upon protonation, which suggests that emission occurs from B only. Using ultrafast transient absorption spectroscopy, we obtained the Evolution-Associated Spectra (EAS) derived from the global analysis of B in HFIP. The ultrafast component corresponds to the Excited State Proton Transfer (ESPT) from the excited state of HB+, while the long-lived component corresponds to the decay of the excited state of B. Once in the ground state, it is protonated again (GSPT) thus restarting the cycle. The stimulated emission of HB+ (SE-HB) is blueshifted when compared to that of B (SE-B), as expected from the absorption spectrum.


FOR MORE INFORMATION
Select Highlight

Month:


Year:





ClustrMaps

Contact:

Eric Vauthey

Physical Chemistry Department - Sciences II - University of Geneva
30, Quai Ernest Ansermet - CH-1211 Geneva 4 (Switzerland)


© All rights reserved by Eric Vauthey and the University of Geneva

Design and code by Guillaume Duvanel