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首页> 外文期刊>Main group chemistry >Effect of alkali metal cations interactions on the intramolecular proton transfers in [cytosine-X](+) adduct ions, X=H, Li, Na, K
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Effect of alkali metal cations interactions on the intramolecular proton transfers in [cytosine-X](+) adduct ions, X=H, Li, Na, K

机译:碱金属阳离子相互作用对[胞嘧啶-X](+)加合离子的分子内质子转移,X = H,Li,Na,K

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摘要

Interactions of H+, Li+, Na+, and K+ cations with five isomers of cytosine were studied employing B3LYP and MP2 methods using 6-311++ G(d,p) basis set. The cation-cytosine interactions affected the relative stability of the isomers, however, in the all complexes, the keto structure was the most stable isomer. Cation-cytosine interactions influenced the energy barriers of intramolecular proton transfers so that in some cases the cations catalyze the proton transfer and in others they increase the activation energies. The observed difference was attributed to the change in the acidity and basicities of the proton donor and acceptor sites and a linear correlation was obtained between acidity and activation energy.
机译:研究了使用6-311 ++ G(D,P)基础设定的B3LYP和MP2方法研究了H +,Li +,Na +和k +阳离子与五个异构体的阳离子。 阳离子胞嘧啶相互作用影响异构体的相对稳定性,然而,在所有复合物中,酮结构是最稳定的异构体。 阳离子 - 胞嘧啶相互作用影响了分子内质子转移的能量屏障,使阳离子催化质子转移,并在其他情况下增加活化能量。 观察到的差异归因于质子供体和受体位点的酸度和碱性的变化,并且在酸度和活化能之间获得了线性相关性。

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