Anti-Kasha Behavior of 3-Hydroxyflavone and Its Derivatives
| Autor: | David Lee Phillips, Hoi Ling Luk, Ka Wa Fan |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Proton
QH301-705.5 Article Catalysis Inorganic Chemistry chemistry.chemical_compound anti-Kasha Ultrafast laser spectroscopy ESIPT Biology (General) Physical and Theoretical Chemistry Spectroscopy QD1-999 Molecular Biology Density Functional Theory Flavonoids Physics Organic Chemistry 3-Hydroxyflavone General Medicine Photochemical Processes Computer Science Applications Chemistry Wavelength chemistry Excited state Femtosecond 3-hydroxyflavone Quantum Theory Spectrophotometry Ultraviolet Protons Atomic physics Excitation |
| Zdroj: | International Journal of Molecular Sciences Volume 22 Issue 20 International Journal of Molecular Sciences, Vol 22, Iss 11103, p 11103 (2021) |
| ISSN: | 1422-0067 |
| DOI: | 10.3390/ijms222011103 |
| Popis: | Excited state intramolecular proton transfer (ESIPT) in 3-hydroxyflavone (3HF) has been known for its dependence on excitation wavelength. Such a behavior violates Kasha’s rule, which states that the emission and photochemistry of a compound would only take place from its lowest excited state. The photochemistry of 3HF was studied using femtosecond transient absorption spectroscopy at a shorter wavelength excitation (266 nm), and these new experimental findings were interpreted with the aid of computational studies. These new results were compared with those from previous studies that were obtained with a longer wavelength excitation and show that there exists a pathway of proton transfer that bypasses the normal first excited state from the higher excited state to the tautomer from first excited state. The experimental data correlate with the electron density difference calculations such that the proton transfer process is faster on the longer excitation wavelength than compared to the shorter excitation wavelength. |
| Databáze: | OpenAIRE |
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