Excited State Dynamics of Rh(II) Tetramesityl Porphyrin Monomer from Nanosecond Transient Absorption and Emission Spectroscopy

1996 ◽  
Vol 100 (1) ◽  
pp. 207-213 ◽  
Author(s):  
S. E. Vitols ◽  
Duane A. Friesen ◽  
Darryl S. Williams ◽  
Dan Melamed ◽  
Thomas G. Spiro
Keyword(s):  
Excited State ◽  
Emission Spectroscopy ◽  
Transient Absorption ◽  
Absorption And Emission ◽  
Excited State Dynamics ◽  
Absorption And Emission Spectroscopy

Ground- and excited-state absorption and emission spectroscopy of Nd:GGG

2012 ◽  
Vol 132 (10) ◽  
pp. 2521-2524 ◽  
Author(s):  
R. Soulard ◽  
B. Xu ◽  
J.L. Doualan ◽  
P. Camy ◽  
R. Moncorgé
Keyword(s):  
Excited State ◽  
Emission Spectroscopy ◽  
Excited State Absorption ◽  
Absorption And Emission ◽  
Absorption And Emission Spectroscopy

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 Two Symmetrical Squarylium Cyanine Dyes: Synthesis, Photophysics and Antifungal Activity in Saccharomyces cerevisiae

2020 ◽  
Vol 3 (1) ◽  
pp. 106
Author(s):  
Vanessa S. D. Gomes ◽  
João C. C. Ferreira ◽  
Renato E. F. Boto ◽  
Paulo Almeida ◽  
Maria João M. F. Sousa ◽  
...  
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Minimum Inhibitory Concentration ◽  
Antifungal Activity ◽  
Emission Spectroscopy ◽  
Inhibitory Concentration ◽  
Analytical Techniques ◽  
Cyanine Dyes ◽  
Absorption And Emission ◽  
Nir Absorption ◽  
Absorption And Emission Spectroscopy

Two squarylium cyanine dyes were synthesized and characterized by the usual analytical techniques, including Vis-NIR absorption and emission spectroscopy. Their antifungal activity was evaluated, through the obtention of minimum inhibitory concentration (MIC) values, using yeasts of the species Saccharomyces cerevisiae as a biological model.

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