Spectral-Luminescent Study of the Acid–Base Equilibrium of 5-Aminouracil and 6-Aminouracil in Aqueous Solutions

The spectral fluorescence characteristics of 5-aminouracil (5AU) and 6-aminouracil (6AU) in neutral and alkaline aqueous solutions have been studied. With the use of the density functional theory, it has been shown that uracils preferentially dissociate at the N1–H bond. The acid–base equilibrium co...

Full description

Saved in:
Bibliographic Details
Published in:High energy chemistry 2023-02, Vol.57 (1), p.1-6
Main Authors: Ostakhov, S. S., Kayumova, R. R., Akhiyarov, A. A., Ivanov, S. P., Khursan, S. L.
Format: Article
Language:English
Subjects:
Aqueous solutions
Chemical equilibrium
Chemistry
Chemistry and Materials Science
Density functional theory
Fluorescence
Hydrogen bonds
Photonics
Physical Chemistry
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The spectral fluorescence characteristics of 5-aminouracil (5AU) and 6-aminouracil (6AU) in neutral and alkaline aqueous solutions have been studied. With the use of the density functional theory, it has been shown that uracils preferentially dissociate at the N1–H bond. The acid–base equilibrium constants p K a1 (5AU) = 9.4 and p K a1 (6AU) = 8.95 were determined by a fluorescence method. It was concluded that the ultrashort lifetime of the excited singlets of 5AU and 6AU prevents the measurement of the acid–base equilibrium constant of uracils in an electronically excited state.
ISSN:0018-1439
1608-3148
DOI:10.1134/S0018143923010101