Wavelength dependent mechanism of phenolate photooxidation in aqueous solution.

Wavelength dependent mechanism of phenolate photooxidation in aqueous solution.
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DOI:
10.1039/d3sc00016h
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发表时间:
2023-03-22
期刊:
影响因子:
8.4
通讯作者:
--
中科院分区:
化学1区
文献类型:
--
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酚盐光氧化是一系列生物过程不可或缺的一部分,但电子发射的机制一直存在争议。在这里,我们结合飞秒瞬态吸收光谱、液体微射流光电子能谱和高级量子化学计算,研究了在一系列波长(从 S0-S1 吸收带的起始点到 S0-S2 带的峰值)激发后水性酚盐的光氧化动力学。我们发现,对于 λ ≥ 266 nm,电子从 S1 态喷射到与接触对相关的连续体中,其中 PhO˙ 自由基处于其基电子态。相比之下,我们发现,对于 λ ≤ 257 nm,电子喷射也会发生在与包含电子激发的 PhO˙ 自由基的接触对相关的连续体中,并且这些接触对比包含电子基态 PhO˙ 自由基的接触对具有更快的复合时间。酚盐光氧化是一系列生物过程不可或缺的一部分,但电子发射的机制一直存在争议。
Phenolate photooxidation is integral to a range of biological processes, yet the mechanism of electron ejection has been disputed. Here, we combine femtosecond transient absorption spectroscopy, liquid-microjet photoelectron spectroscopy and high-level quantum chemistry calculations to investigate the photooxidation dynamics of aqueous phenolate following excitation at a range of wavelengths, from the onset of the S0–S1 absorption band to the peak of the S0–S2 band. We find that for λ ≥ 266 nm, electron ejection occurs from the S1 state into the continuum associated with the contact pair in which the PhO˙ radical is in its ground electronic state. In contrast, we find that for λ ≤ 257 nm, electron ejection also occurs into continua associated with contact pairs containing electronically excited PhO˙ radicals and that these contact pairs have faster recombination times than those containing PhO˙ radicals in their ground electronic state. Phenolate photooxidation is integral to a range of biological processes, yet the mechanism of electron ejection has been disputed.
DOI: 10.1039/c6sc05529j
发表时间: 2017-04-01
期刊: Chemical science
影响因子: 8.4
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Bochenkova AV;Mooney CRS;Parkes MA;Woodhouse JL;Zhang L;Lewin R;Ward JM;Hailes HC;Andersen LH;Fielding HH
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发表时间: 1984-01-01
期刊: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA-BIOLOGICAL SCIENCES
影响因子: --
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