The role of copper(II) ions in the oxidation of 5-hydroxy-6-methyluracil in the ground and electronically excited states with molecular oxygen in aqueous solutions
- Authors: Ostakhov S.S.1, Khursan S.L.1, Murinov Y.I.1, Nugumanov T.R.1, Kayumova R.R.1, Petrova S.F.1
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Affiliations:
- Institute of Organic Chemistry, Ufa Scientific Center
- Issue: Vol 51, No 1 (2017)
- Pages: 32-37
- Section: Photonics
- URL: https://journal-vniispk.ru/0018-1439/article/view/157101
- DOI: https://doi.org/10.1134/S0018143916060138
- ID: 157101
Cite item
Abstract
A spectral fluorescence study of photoinduced reactions in aqueous solutions has been carried out in order to examine the mechanisms of the oxidation of 5-hydroxy-6-methyluracil (I) in the ground and electronically excited states by molecular oxygen in the presence of copper(II) chloride. It has been found that 5,5,6-trihydroxy-6-methylpyrimidine-2,4-dione (II) is formed upon the photolysis of I. The spectral parameters (λmax) and the quantum yields (φ) of fluorescence (FL) of compounds I (φ = 8 × 10–4; λmax = 362 nm) and II (φ = 17 × 10–4; λmax = 306, 330 nm) have been determined. A reaction scheme was proposed, according to which the photooxidation of I occurs through the steps of the generation of the radical cation I•+ and the superoxide anion О2•- with the subsequent formation of 5,5,6-trihydroxy-6-methylpyrimidine-2,4-dione. The catalytic and inhibitory effects of Cu(II) ions on the oxidation of 5-hydroxy-6-methyluracil in the ground and electronically excited states, respectively, by the oxygen radical anion О2•- have been revealed.
About the authors
S. S. Ostakhov
Institute of Organic Chemistry, Ufa Scientific Center
Author for correspondence.
Email: chemlum@anrb.ru
Russian Federation, Ufa, 450054
S. L. Khursan
Institute of Organic Chemistry, Ufa Scientific Center
Email: chemlum@anrb.ru
Russian Federation, Ufa, 450054
Yu. I. Murinov
Institute of Organic Chemistry, Ufa Scientific Center
Email: chemlum@anrb.ru
Russian Federation, Ufa, 450054
T. R. Nugumanov
Institute of Organic Chemistry, Ufa Scientific Center
Email: chemlum@anrb.ru
Russian Federation, Ufa, 450054
R. R. Kayumova
Institute of Organic Chemistry, Ufa Scientific Center
Email: chemlum@anrb.ru
Russian Federation, Ufa, 450054
S. F. Petrova
Institute of Organic Chemistry, Ufa Scientific Center
Email: chemlum@anrb.ru
Russian Federation, Ufa, 450054
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