首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Proton Transfer vs Complex Formation Channels in Ionized Formic Acid Dimer: A Direct Ab Initio Molecular Dynamics Study
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Proton Transfer vs Complex Formation Channels in Ionized Formic Acid Dimer: A Direct Ab Initio Molecular Dynamics Study

机译:电离甲酸二聚体中的质子转移与复合形成通道:直接AB Initio分子动力学研究

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摘要

Photoirradiation to a hydrogen-bonded system plays an important role in the initial DNA and enzyme damage processes. The formic acid (FA) dimer is a model compound of double proton transfer systems, such as DNA base pairs. In the present study, the reactions of the FA dimer cation, formed upon ionization of the neutral dimer, have been investigated by the direct ab initio molecular dynamics method. Two reaction channels were identified for the FA dimer cation: complex formation and proton transfer (PT). In the complex formation channel, the carbonyl oxygen atoms of the two FA monomers were bound symmetrically, and a face-to-face complex was formed. In the PT channel, the proton of FA(+) was transferred to FA, forming the H+(HCOOH)-HCO2 radical cation as product. At low temperature, the complex channel was dominant, whereas the PT channel increased with increasing temperature. The asymmetric spin distribution on the FA dimer cation exhibited a strong correlation with the PT channel.
机译:对氢键合系统的光辐射在初始DNA和酶损伤过程中起重要作用。 甲酸(FA)二聚体是双质子转移系统的模型化合物,例如DNA碱基对。 在本研究中,通过直接AB初始分子动力学方法研究了在中性二聚体的电离后形成的FA二聚体阳离子的反应。 为FA二聚体阳离子鉴定出两种反应通道:复杂的形成和质子转移(Pt)。 在复杂的形成通道中,两个FA单体的羰基氧原子对称地结合,形成面对面复合物。 在PT通道中,将Fa(+)的质子转移至Fa,形成H +(HCOOH)-HCO2作为产物的自由基阳离子。 在低温下,复杂的通道占主导地位,而Pt通道随温度的增加而增加。 FA二聚体阳离子上的不对称旋转分布表现出与PT通道的强烈相关性。

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