Fluorescence from the second excited singlet state (S2) of 3-hydroxyflavone (3HF) has been observed for the first time in supercritical carbon dioxide (sc-CO2) environment. Steady-state experiments reveal that the intramolecular proton transfer is less effective from the S2state of 3HF compared to that from the S1state. © 2004 Elsevier B.V. All rights reserved.
Chattopadhyay, N., Barroso, M., Serpa, C., Arnaut, L. G., & Formosinho, S. J. (2004). Fluorescence from the second excited singlet state of 3-hydroxyflavone in supercritical CO2. Chemical Physics Letters, 387(4–6), 258–262. https://doi.org/10.1016/j.cplett.2004.02.021