scholarly journals Complexes of a naphthalimide photoacid with organic bases, and their excited-state dynamics in polar aprotic organic solvents

2015 ◽  
Vol 17 (32) ◽  
pp. 20715-20724 ◽  
Author(s):  
Tatu Kumpulainen ◽  
Bert H. Bakker ◽  
Albert M. Brouwer
Keyword(s):  
Excited State ◽  
Organic Solvents ◽  
Ground State ◽  
Ion Pair ◽  
Excited State Dynamics ◽  
Organic Bases ◽  
P Addition

Addition of a base to a solution of a photoacid in aprotic organic solvents results in the formation of ground-state complexes, which upon excitation dissociate via intermediate ion pair species.

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>

scholarly journals Photoinduced Interactions in a Pyrene-Calix[4]arene-Perylene Bisimide Dye System: Probing Ground-State Conformations with Excited-State Dynamics of Charge Separation and Recombination

2009 ◽  
Vol 113 (42) ◽  
pp. 18358-18368 ◽  
Author(s):  
Nguyen Vân Anh ◽  
Felix Schlosser ◽  
Michiel M. Groeneveld ◽  
Ivo H. M. van Stokkum ◽  
Frank Würthner ◽  
...  
Keyword(s):  
Excited State ◽  
Ground State ◽  
Charge Separation ◽  
Excited State Dynamics ◽  
Perylene Bisimide

Ultrafast Excited-State Dynamics of all-trans-Capsanthin in Organic Solvents

2017 ◽  
Vol 121 (44) ◽  
pp. 8380-8388 ◽  
Author(s):  
Mirko Scholz ◽  
Oliver Flender ◽  
Thomas Lenzer ◽  
Kawon Oum
Keyword(s):  
Excited State ◽  
Organic Solvents ◽  
Excited State Dynamics

scholarly journals 5-Fluorotryptophan as dual probe for ground-state heterogeneity and excited-state dynamics in apoflavodoxin

FEBS Letters ◽  
2009 ◽  
Vol 583 (17) ◽  
pp. 2785-2788 ◽  
Author(s):  
N.V. Visser ◽  
A.H. Westphal ◽  
S.M. Nabuurs ◽  
A. van Hoek ◽  
C.P.M. van Mierlo ◽  
...  
Keyword(s):  
Excited State ◽  
Ground State ◽  
Excited State Dynamics ◽  
Dual Probe

scholarly journals Effect of solvent polarity on the photophysical properties of chalcone derivatives

RSC Advances ◽  
2017 ◽  
Vol 7 (39) ◽  
pp. 24204-24214 ◽  
Author(s):  
Rekha Kumari ◽  
Anitha Varghese ◽  
Louis George ◽  
Sudhakar Y. N.
Keyword(s):  
Excited State ◽  
Organic Solvents ◽  
Ground State ◽  
Photophysical Properties ◽  
Solvent Polarity ◽  
Chalcone Derivatives ◽  
Effect Of Solvent

The photophysical properties were studied for FNPO, AFPO and FHPO in different organic solvents. The excited state of the molecules were found to be more polar than the ground state.

Molecular Road Map to Tuning Ground State Absorption and Excited State Dynamics of Long-Wavelength Absorbers

2017 ◽  
Vol 139 (46) ◽  
pp. 16946-16958 ◽  
Author(s):  
Yusong Bai ◽  
Jean-Hubert Olivier ◽  
Hyejin Yoo ◽  
Nicholas F. Polizzi ◽  
Jaehong Park ◽  
...  
Keyword(s):  
Excited State ◽  
Ground State ◽  
Ground State Absorption ◽  
Excited State Dynamics ◽  
Long Wavelength ◽  
Road Map
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