Dual Time-Scale Proton Transfer and High-Energy, Long-Lived Excitons Unveiled by Broadband Ultrafast Time-Resolved Fluorescence in Adenine–Uracil RNA Duplexes

2022 ◽  
pp. 302-311
Author(s):  
Ruth Chau-Ting Chan ◽  
Chensheng Ma ◽  
Allen Ka-Wa Wong ◽  
Chris Tsz-Leung Chan ◽  
Joshua Chiu-Lok Chow ◽  
...  
Keyword(s):  
Proton Transfer ◽  
Time Scale ◽  
High Energy ◽  
Time Resolved Fluorescence ◽  
Time Resolved ◽  
Rna Duplexes

Observation of Excited State Proton Transfer between the Titania Surface and Dye Molecule by Time-Resolved Fluorescence Spectroscopy

2021 ◽  
Vol 125 (40) ◽  
pp. 21958-21963
Author(s):  
Hiromasa Nishikiori ◽  
Yosuke Kageshima ◽  
Nasrin Hooshmand ◽  
Mostafa A. El-Sayed ◽  
Katsuya Teshima
Keyword(s):  
Excited State ◽  
Fluorescence Spectroscopy ◽  
Proton Transfer ◽  
Time Resolved Fluorescence ◽  
Time Resolved ◽  
Excited State Proton Transfer ◽  
Titania Surface ◽  
Dye Molecule

Excited-state intramolecular proton transfer and conformational relaxation in 4′-N,N-dimethylamino-3-hydroxyflavone doped in acetonitrile crystals

2016 ◽  
Vol 18 (41) ◽  
pp. 28564-28575 ◽  
Author(s):  
Kazuki Furukawa ◽  
Norifumi Yamamoto ◽  
Kazuyuki Hino ◽  
Hiroshi Sekiya
Keyword(s):  
Excited State ◽  
Steady State ◽  
Fluorescence Spectroscopy ◽  
Proton Transfer ◽  
Intramolecular Proton Transfer ◽  
Time Resolved Fluorescence ◽  
Time Resolved ◽  
Conformational Relaxation ◽  
Excited State Dynamics

Excited-state dynamics of 4′-N,N-dimethylamino-3-hydroxyflavone doped in acetonitrile crystals has been investigated by using steady-state and time-resolved fluorescence spectroscopy.

Steric Control of the Excited-State Intramolecular Proton Transfer in 3-Hydroxyquinolones:  Steady-State and Time-Resolved Fluorescence Study

2007 ◽  
Vol 111 (37) ◽  
pp. 8986-8992 ◽  
Author(s):  
Dmytro A. Yushchenko ◽  
Volodymyr V. Shvadchak ◽  
Andrey S. Klymchenko ◽  
Guy Duportail ◽  
Vasyl G. Pivovarenko ◽  
...  
Keyword(s):  
Excited State ◽  
Steady State ◽  
Proton Transfer ◽  
Intramolecular Proton Transfer ◽  
Time Resolved Fluorescence ◽  
Fluorescence Study ◽  
Time Resolved ◽  
Steric Control

scholarly journals Nonadiabatic quantum dynamics of the coherent excited state intramolecular proton transfer of 10-hydroxybenzo[h]quinoline

2021 ◽  
Author(s):  
David Picconi
Keyword(s):  
Excited State ◽  
Proton Transfer ◽  
Quantum Dynamics ◽  
Density Functional ◽  
Active Role ◽  
High Energy ◽  
Spectroscopic Studies ◽  
Intramolecular Proton Transfer ◽  
Time Resolved ◽  
Proton Transfer Reactions

The photoinduced nonadiabatic dynamics of the enol-keto isomerization of 10-hydroxybenzo[h]quinoline (HBQ) are studied computationally using high dimensional quantum dynamics. The simulations are based on a diabatic vibronic coupling Hamiltonian, which includes the two lowest ππ* excited states and a nπ* state, which has high energy in the Franck-Condon zone, but significantly stabilizes upon excited state intramolecular proton transfer. A procedure, applicable to large classes of excited state proton transfer reactions, is presented to parametrize this model using potential energies, forces and force constants, which, in this case, are obtained by time-dependent density functional theory. The wave packet calculations predict a time scale of 10-15 fs for the photoreaction, and reproduce the time constants and the coherent oscillations observed in time-resolved spectroscopic studies performed on HBQ. In contrast to the interpretation given to the most recent experiments, it is found that the reaction initiated by 1ππ* ← S0 photoexcitation proceeds essentially on a single potential energy surface, and the observed coherences bear signatures of Duschinsky mode-mixing along the reaction path. The dynamics after the 2ππ* ← S0 excitation are instead nonadiabatic, and the nπ* state plays a major role in the relaxation process. The simulations suggest a mainly active role of the proton in the isomerization, rather than a passive migration assisted by the vibrations of the benzoquinoline backbone.

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