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Two Uracil Molecules Connected by an Excess Electron

机译:通过过量电子连接的两个尿嘧啶分子

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In this work we considered a new form of the uracil dimer anion (U_2~-). In this system the excess electron is suspended between two uracil molecules and provides sufficient bonding between them to stabilize the dimer in a local minimum on its potential energy surface. Ab initio calculations are employed to describe the system. Anions of the nucleic acid bases of this kind can be formed in two steps. First a dipole-bound anion is formed by a molecule of one of the bases. Then a molecule of the second base attaches to the diffuse dipole-bound electron at the opposite side with respect to the first base. Removal of the excess electron leads to a significant change of the structure of the complex. Its geometry optimization initiated with the anion geometry converges to a conventional hydrogen-bonded dimer with a total energy lower than the energy of the anion. Thus the two uracils connected by a suspended excess electron in the middle are a metastable system.
机译:在这项工作中,我们考虑了一种新形式的尿嘧啶二聚体阴离子(U_2〜-)。在该系统中,多余的电子悬浮在两个尿嘧啶分子之间,并在它们之间提供足够的键合,以将二聚体稳定在其势能面上的局部最小值中。从头算起就被用来描述系统。这种核酸碱基的阴离子可以分两步形成。首先,由一个碱基之一的分子形成与偶极结合的阴离子。然后,第二碱基的分子在相对于第一碱基相反的一侧附着于扩散偶极子结合的电子。多余电子的去除导致络合物结构的显着变化。从阴离子几何形状开始的几何优化收敛到常规氢键二聚体,其总能量低于阴离子的能量。因此,通过中间悬浮的多余电子连接的两个尿嘧啶是亚稳体系。

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