ChemInform Abstract: TRANSIENT ABSORPTION STUDY OF THE INTRAMOLECULAR EXCITED-STATE AND GROUND-STATE PROTON TRANSFER IN 3-HYDROXYFLAVONE AND 3-HYDROXYCHROMONE

1983 ◽  
Vol 14 (35) ◽  
Author(s):  
M. ITOH ◽  
Y. TANIMOTO ◽  
K. TOKUMURA
Keyword(s):  
Excited State ◽  
Proton Transfer ◽  
Ground State ◽  
Transient Absorption ◽  
Absorption Study

Excited-State Dynamics in the RNA Nucleotide Uridine 5’-Monophosphate Investigated by Femtosecond Broadband Transient Absorption Spectroscopy

2019 ◽  
Author(s):  
Matthew M. Brister ◽  
Carlos Crespo-Hernández
Keyword(s):  
Excited State ◽  
Excited States ◽  
Ground State ◽  
Transient Absorption ◽  
Electronic Energy ◽  
Transient Absorption Spectroscopy ◽  
Electronic Relaxation ◽  
Vibrationally Excited ◽  
Excited State Dynamics ◽  
Π State

<p></p><p> Damage to RNA from ultraviolet radiation induce chemical modifications to the nucleobases. Unraveling the excited states involved in these reactions is essential, but investigations aimed at understanding the electronic-energy relaxation pathways of the RNA nucleotide uridine 5’-monophosphate (UMP) have not received enough attention. In this Letter, the excited-state dynamics of UMP is investigated in aqueous solution. Excitation at 267 nm results in a trifurcation event that leads to the simultaneous population of the vibrationally-excited ground state, a longlived <sup>1</sup>n<sub>O</sub>π* state, and a receiver triplet state within 200 fs. The receiver state internally convert to the long-lived <sup>3</sup>ππ* state in an ultrafast time scale. The results elucidate the electronic relaxation pathways and clarify earlier transient absorption experiments performed for uracil derivatives in solution. This mechanistic information is important because long-lived nπ* and ππ* excited states of both singlet and triplet multiplicities are thought to lead to the formation of harmful photoproducts.</p><p></p>

Excited state relaxation paths in 9,9′-bianthryl and 9-carbazolyl-anthracene: a sub-ps transient absorption study

2000 ◽  
Vol 253 (2-3) ◽  
pp. 339-349 ◽  
Author(s):  
Martin Jurczok ◽  
Pascal Plaza ◽  
Monique M Martin ◽  
Yves H Meyer ◽  
Wolfgang Rettig
Keyword(s):  
Excited State ◽  
Transient Absorption ◽  
Absorption Study

Excited-state dynamics of heteroleptic copper(i) photosensitizers and their electrochemically reduced forms containing a dipyridophenazine moiety – a spectroelectrochemical transient absorption study

2019 ◽  
Vol 21 (20) ◽  
pp. 10716-10725
Author(s):  
Ying Zhang ◽  
Linda Zedler ◽  
Michael Karnahl ◽  
Benjamin Dietzek
Keyword(s):  
Excited State ◽  
Transient Absorption ◽  
Absorption Study ◽  
Excited State Dynamics ◽  
Reduced Forms

Heteroleptic copper(i) dipyridophenazine complexes were investigated by transient absorption spectroelectrochemistry to examine their multi-electron photoaccumulation properties.

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