Photochemical reactions of 2,2?-furil. Solvent dependent photoreduction via the lowest excited singlet and triplet states

1992 ◽  
Vol 5 (6) ◽  
pp. 355-360 ◽  
Author(s):  
Hiroyasu Inoue ◽  
Tadamitsu Sakurai ◽  
Toshihiko Hoshi ◽  
Isao Ono ◽  
Jun Okubo
Keyword(s):  
Photochemical Reactions ◽  
Triplet States ◽  
Excited Singlet ◽  
Singlet And Triplet States

Photophysical and Photochemical Properties of Some Fluorescent Derivatives of Vitamin B1

1987 ◽  
Vol 42 (5) ◽  
pp. 485-489 ◽  
Author(s):  
B. Marciniak
Keyword(s):  
Vitamin B1 ◽  
Emission Spectra ◽  
Photochemical Reactions ◽  
Triplet States ◽  
Excited Singlet ◽  
Yield Data ◽  
Singlet And Triplet States ◽  
Kinetics Of ◽  
Derivatives Of ◽  
Fluorescent Derivatives

Absorption and emission spectra, depopulation kinetics of the lowest excited singlet and triplet states and acid-base equilibria of two fluorescent vitamin B, derivatives, the products I and II of the reaction of N-methylated vitamine B, with cytidine and adenosine, respectively, were investigated. Analysis of the lifetime and quantum yield data indicate that at 77 K emissions are the main processes of deactivation of the S1 and T1 states for the free ion and protonated forms. The pKa values indicate a much higher acidity in the excited singlet and triplet states than in the ground state. I and II undergo very slow photochemical reactions in solution in the presence of oxygen (Φ ~ 10-4).

scholarly journals Organic molecules with inverted gaps between first excited singlet and triplet states and appreciable fluorescence rates

Matter ◽  
2021 ◽  
Author(s):  
Robert Pollice ◽  
Pascal Friederich ◽  
Cyrille Lavigne ◽  
Gabriel dos Passos Gomes ◽  
Alán Aspuru-Guzik
Keyword(s):  
Organic Molecules ◽  
Triplet States ◽  
Excited Singlet ◽  
Singlet And Triplet States

scholarly journals The Tautomeric Conformers for the Molecules of Guanine and Cytosine. Some Rem arks about Their Stability

1977 ◽  
Vol 32 (9-10) ◽  
pp. 870-873 ◽  
Author(s):  
Julio Marañon ◽  
Oscar M. Sorarrain
Keyword(s):  
Experimental Data ◽  
Triplet States ◽  
Excited Singlet ◽  
Singlet And Triplet States ◽  
Semi Empirical

Abstract In this paper we seek to determine the shape of the barrier between the normal and tautomeric conformers for some excited singlet and triplet states in the molecules of guanine and cytosine. The molecules are considered isolated and a particular movement of the H atom is analysed.The semi-empirical CNDO/2-CI has been used. The calculated results are compared with the available experimental data.

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