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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Decay Pathways of Thymine and Methyl-Substituted Uracil and Thymine in the Gas Phase
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Decay Pathways of Thymine and Methyl-Substituted Uracil and Thymine in the Gas Phase

机译：气相中胸腺嘧啶和甲基取代的尿嘧啶和胸腺嘧啶的衰变途径

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摘要

We report observations of a dark state in the decay pathways of thymine, 1,3-dimethyl thymine, 1,3-dimethyl uracil, and 1-methyl uracil in the gas phase. After initial excitation by a nanosecond laser, the excited molecules failed to return to the ground state but rather were trapped in a dark state for tens to hundreds of nanoseconds. This result contradicts those reported in water solutions. We therefore propose that the photochemistry of these pyrimidine bases is different in the gas phase from that in the liquid phase and that the dark state is effectively quenched in water solutions. Although we do not have a quantitative measure of the yield of this dark state, the fact that further ionization from this dark state has a high yield in the deep UV makes this pathway important in the chemistry of nucleic acid bases. This result further implies that the photostability of our genetic code may not be an inherent property of the bases themselves.
机译：我们报告在气相中的胸腺嘧啶，1，3-二甲基胸腺嘧啶，1，3-二甲基尿嘧啶和1-甲基尿嘧啶的衰变途径中观察到暗态。在被纳秒激光最初激发之后，被激发的分子无法返回基态，而是被困在黑暗状态数十到数百纳秒。该结果与水溶液中报道的结果相矛盾。因此，我们提出这些嘧啶碱的光化学在气相中不同于在液相中，并且暗态在水溶液中被有效地猝灭。尽管我们没有定量测量该暗态产率的方法，但从该暗态进一步电离在深紫外线中的产率很高，这一事实使该途径在核酸碱基的化学中很重要。该结果进一步暗示我们遗传密码的光稳定性可能不是碱基本身的固有特性。

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