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Role of an Inorganic Phosphate in the Photogeneration of Hydrogen Peroxide in Aqueous Solutions of Adenine Derivatives at 77 K
Russian Journal of Physical Chemistry A ( IF 0.7 ) Pub Date : 2021-08-22 , DOI: 10.1134/s0036024421080185
T. A. Lozinova 1 , E. N. Degtyarev 1, 2 , O. N. Brzhevskaya 1 , A. V. Lobanov 2, 3 , A. V. Lander 4
Affiliation  

Abstract

A comparative study is performed of the effect an inorganic phosphate (Pi) has on the formation of hydrogen peroxide in aqueous solutions of 2 × 10−4 M adenine derivatives (AX), such as adenine, adenosine, and adenosine-5'-diphosphate, irradiated at 77 K by near-UV in the wavelength range λ = 260–400 and 290–460 nm. It is found that the yield of H2O2 in irradiated samples grows upon adding 5 × 10−4 M Pi. The yield of H2O2 is normally increased in the presence of NaCl, while a tenfold increase in [Pi] results in only a moderate rise in [H2O2]. It is shown that the effect irradiation has on the yield of H2O2 depends on both AX and the [NaCl] and [Pi] ratio. The obtained data are compared to the results from measuring the EPR spectra of irradiated solutions before defrosting. Possible mechanisms of photoinitiated processes of H2O2 formation in the studied systems are discussed.



中文翻译:

无机磷酸盐在 77 K 腺嘌呤衍生物水溶液中过氧化氢光生成中的作用

摘要

对无机磷酸盐 (P i ) 在 2 × 10 -4 M 腺嘌呤衍生物 (AX) 的水溶液中形成过氧化氢的影响进行了比较研究,例如腺嘌呤、腺苷和腺苷-5'-二磷酸盐,在波长范围 λ = 260-400 和 290-460 nm 的近紫外线下在 77 K 下照射。发现辐照样品中H 2 O 2的产率随着添加5×10 -4 MP i 增加。H 2 O 2的产量在 NaCl 存在下通常会增加,而 [P i ]的十倍增加只会导致 [H 2 O 2]。结果表明,辐照对H 2 O 2产率的影响取决于AX 以及[NaCl] 和[P i ] 的比率。将获得的数据与在解冻前测量辐照溶液的 EPR 光谱的结果进行比较。讨论了所研究系统中H 2 O 2形成的光引发过程的可能机制。

更新日期:2021-08-23
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