58-2: Revealing the Excited-state Dynamics of Thermally Activated Delayed Flourescence Molecules by using Transient Absorption Spectrospy

2016 ◽  
Vol 47 (1) ◽  
pp. 786-789 ◽  
Author(s):  
Takuya Hosokai ◽  
Hiroyuki Matsuzaki ◽  
Akihiro Furube ◽  
Katsumi Tokumaru ◽  
Tetsuo Tsutsui ◽  
...  
Keyword(s):  
Excited State ◽  
Transient Absorption ◽  
Excited State Dynamics ◽  
Thermally Activated

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 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.

Excited-State Dynamics of Metal String Complex Ni3(dpa)4X2from Femtosecond Transient Absorption Spectra

ChemPhysChem ◽  
2010 ◽  
Vol 11 (2) ◽  
pp. 517-524 ◽  
Author(s):  
Chao-Han Cheng ◽  
Ruei-Ding Hung ◽  
Wen-Zhen Wang ◽  
Shie-Ming Peng ◽  
I-Chia Chen
Keyword(s):  
Excited State ◽  
Absorption Spectra ◽  
Transient Absorption ◽  
Excited State Dynamics ◽  
Transient Absorption Spectra ◽  
Femtosecond Transient Absorption

Multi-Pulse Transient Absorption and Carotenoid Excited-State Dynamics: β-Carotene

2005 ◽  
pp. 592-594
Author(s):  
Emmanouil Papagiannakis ◽  
Delmar S. Larsen ◽  
Mikas Vengris ◽  
Ivo H.M. van Stokkum ◽  
Rienk van Grondelle
Keyword(s):  
Excited State ◽  
Transient Absorption ◽  
Excited State Dynamics ◽  
Β Carotene

Investigation of ultrafast excited state dynamics of 2,2′,4,4′,6,6′-hexanitrostilbene using femtosecond transient absorption spectroscopy

RSC Advances ◽  
2014 ◽  
Vol 4 (104) ◽  
pp. 60382-60385 ◽  
Author(s):  
Genbai Chu ◽  
Min Shui ◽  
Ying Xiong ◽  
Jing Yi ◽  
Kemei Cheng ◽  
...  
Keyword(s):  
Excited State ◽  
Excited States ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Excited State Dynamics ◽  
Femtosecond Transient Absorption ◽  
Femtosecond Transient Absorption Spectroscopy

A study on the dynamics and structures of the excited states of 2,2′,4,4′,6,6′-hexanitrostilbene shows equilibrium between vibrationally hot S1 (S*1) and S1 states with lifetimes of 0.8 and 6 ps, respectively.

Ultrafast excited state dynamics of S2 and S1 states of triphenylmethane dyes

2014 ◽  
Vol 16 (31) ◽  
pp. 16824-16831 ◽  
Author(s):  
Pallavi Singhal ◽  
Hirendra N. Ghosh
Keyword(s):  
Excited State ◽  
Transient Absorption ◽  
Tricarboxylic Acid ◽  
Triphenylmethane Dyes ◽  
Excited State Dynamics ◽  
Bromopyrogallol Red ◽  
Pyrogallol Red ◽  
Ultrafast Transient Absorption

Excited state dynamics of S2 and S1 states for a series of TPM dyes, pyrogallol red (PGR), bromopyrogallol red (Br-PGR) and aurin tricarboxylic acid (ATC), have been monitored by using ultrafast transient absorption and fluorescence up-conversion techniques.

Ultrafast Z → E photoisomerisation of structurally modified furylfulgides

2014 ◽  
Vol 16 (36) ◽  
pp. 19556-19563 ◽  
Author(s):  
Falk Renth ◽  
Ron Siewertsen ◽  
Frank Strübe ◽  
Jochen Mattay ◽  
Friedrich Temps
Keyword(s):  
Excited State ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Chemical Modifications ◽  
Structural Motifs ◽  
Excited State Dynamics ◽  
Femtosecond Transient Absorption ◽  
Femtosecond Transient Absorption Spectroscopy

Femtosecond transient absorption spectroscopy of Z-fulgides with selected structural motifs revealed fast and direct excited-state dynamics independent of chemical modifications.

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