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Anionic and Neutral Complexes of Uracil and Water

机译:尿嘧啶和水的阴离子和中性络合物

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摘要

Several isomeric structures of the uracil-water complex and its covalent-bound anion were calculated ab initio with second-order, many-body, perturbation theory and the 6-311++G** basis set. In all neural complexes, water forms two hydrogen bonds with uracil. In each of the conventional anionic forms, a single, but stronger and shorter, hydrogen bond is found. All complexes are nonplanar, but ring-puckering is less pronounced in neutrals than in anions. Several isomers of the anionic uracil-water complex have positive adiabatic electron-detachment energies. The existence of multiple anionic isomers with vertical electron-detachment energies between 0.30 and 0.90 eV accounts for the broad photoelectron spectrum. The lowest unoccupied molecular orbital of the neutral complex at the geometry of the anionic complex provides a simple explanation for the structural and energetic consequences of electron attachment.
机译:尿嘧啶-水络合物及其共价键阴离子的几个异构结构是从头计算的,采用了二阶,多体,扰动理论和6-311 ++ G **基集。在所有神经复合物中,水与尿嘧啶形成两个氢键。在每种常规的阴离子形式中,均发现了单个但更强和更短的氢键。所有的配合物都是非平面的,但是在中性化合物中,比在阴离子中,起皱的现象不那么明显。阴离子尿嘧啶-水配合物的几种异构体具有绝热的电子离解能。垂直电子离解能在0.30和0.90 eV之间的多种阴离子异构体的存在说明了宽的电子光谱。在阴离子络合物的几何结构中,中性络合物的最低未占据分子轨道为电子附着的结构和能量后果提供了简单的解释。

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