A rapid intramolecular proton transfer is observed in the lowest excited singlet state of 3-hydroxypicolinamide. A temperatureindependent tautomerization rate of > 2X lOI s-' is deduced from steady-state and picosecond fluorescence measurements at both room temperature and 77 K. The lack of any dete
Excited state proton-transfer spectroscopy of 3-hytdroxyflavone and quercetin
β Scribed by Pradeep K. Sengupta; Michael Kasha
- Publisher
- Elsevier Science
- Year
- 1979
- Tongue
- English
- Weight
- 274 KB
- Volume
- 68
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
π SIMILAR VOLUMES
## 3aminoacridme (I) has been used to extend the quantitation of acited-state proton-transfer kinetics in concentrated acid media to ==13 hl sulfuric acid. The hydration requirement of tire reaction and the reasons for its not attaining equilibrium witbin the lifetime of the excited state are disc
The femtosecond kinetics associated with intramolecular proton transfer in the electronically excited state of aromatic molecules is investigated. The initial enol structure of 2-(2'-hydroxyphenyl)benzothiazole (HBT) is excited by a femtosecond UV pulse at 3 15 nm and the risetime of the emission of
Fluorimetric titrations of 4-hydroxydiphenyl ether and its anion give stretched sigmoid curves with two inflection points. This reveals that the rates of excited state proton exchange are comparable to the rates of deactivation of the conjugate pair. These curves are analyzed using the lifetimes of
The excited state dynamics of jet-cooled 3-hydroxyflavone and its methanol complexes have been studied using both timeresolved dynamic measurements and excitation and emission spectroscopy. Methanol complexation has a significant effect on the molecule's emission spectrum and fluorescent lifetime, a