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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >C vs N: Which End of the Cyanide Anion Is a Better Hydrogen Bond Acceptor?
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C vs N: Which End of the Cyanide Anion Is a Better Hydrogen Bond Acceptor?

机译:C vs N:氰化物阴离子的哪个末端是更好的氢键受体?

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The ability of the C and N ends of the cyanide anion (CN~?) as acceptors of hydrogen bonds, an experimentally difficult problem, has been computationally examined in this study. Structures obtained in our previous work involving cyanide binding within the cavity of a triazolophane macrocycle (Chem.--Eur. J. 2011, 17, 9123?9129) were used to analyze the problem. Three different approaches involving (a) breakdown of the triazolophane into smaller components, (b) population analyses, and (c) ion?dipole analyses helped demonstrate that the N terminus of cyanide is a slightly better hydrogen bond acceptor than the C terminus even though it is not the site of protonation or covalent bond formation. This outcome reflects a competition between the preference for noncovalent interactions at the nitrogen and covalent bond formation at the carbon.
机译:在这项研究中,已经对氰化物阴离子(CN〜α)的C和N端作为氢键受体的能力进行了研究,这是一个实验上困难的问题。我们在以前的工作中获得的结构涉及三唑烷大环腔内的氰化物结合(Chem .-- Eur。J. 2011,17,9,9123?9129),用于分析问题。三种不同的方法涉及(a)将三唑并烷分解为较小的组分,(b)人口分析,以及(c)离子偶极分析有助于证明,即使N氰化物的氢键受体也比C末端稍好,尽管它不是质子化或共价键形成的位置。这一结果反映了氮对非共价相互作用的偏好与碳对共价键形成的竞争。

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