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首页> 外文期刊>Crystal growth & design >Understanding the Role Structural Changes Play in the Formation of Strong and Weak Hydrogen Bonds in Tetramethylalkyldiammonium Dithiocyanate Salts
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Understanding the Role Structural Changes Play in the Formation of Strong and Weak Hydrogen Bonds in Tetramethylalkyldiammonium Dithiocyanate Salts

机译:了解结构变化在四甲基烷基二铵二硫氰酸盐中形成强弱氢键的作用

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Structural analyses for a series of tetramethylalkyldiammonium dithiocyanate salts have been carried out on low-temperature and high-resolution X-ray diffraction data. This series of organic salts contains both strong and weak hydrogen bonds which vary depending on the number of methylene groups bridging the two ammonium portions of the molecules. The S-N center dot center dot center dot H angles associated with the strong N-H center dot center dot center dot N hydrogen bonds in this series progressively decrease as the length of the alkyl bridge increases (ethylene > propylene > butylene). This results in less linear interaction between the N-H donor groups and the lone pair of the N acceptor atoms. The N,N,N',N'-tetramethylpropylenediammonium and N,N,N',N'-tetramethylbutylenediammonium dithiocyanate salts also produce weak C-H center dot center dot center dot N hydrogen bonds. The C-H center dot center dot center dot N and N-H center dot center dot center dot N interactions in this series undergo bifurcation, while one set of C-H center dot center dot center dot N and N-H center dot center dot center dot N hydrogen bonds in the propylene salt appears to experience a cooperative effect. A comparison of the topological properties of the electron density has shown a number of similarities and differences in the electronic nature of the strong and weak interactions in all three salts. This has all led to a better understanding of the electronic nature of these interactions and how they logically distribute themselves in the crystalline state.
机译:在低温和高分辨率X射线衍射数据上进行了一系列四甲基烷基二铵二硫氰酸盐的结构分析。这一系列有机盐既含有强氢键,也含有弱氢键,这取决于桥接分子的两个铵部分的亚甲基的数目。随着烷基桥的长度增加(乙烯>丙烯>丁烯),与该系列的强N-H中心点中心点中心点N氢键相关的S-N中心点中心点中心点H角逐渐减小。这导致N-H供体基团与N个受体原子的孤对之间的线性相互作用较少。 N,N,N′,N′-四甲基丙烯二铵和N,N,N′,N′-四甲基丁烯二铵二硫氰酸盐也产生弱的C-H中心点中心点中心点N氢键。该系列中的CH中心点中心点中心点N和NH中心点中心点中心点N相互作用发生分叉,而CH中心点中心点中心点N和NH中心点中心点中心点N中的一组氢键丙烯盐似乎具有协同作用。电子密度的拓扑性质的比较显示,所有三种盐的强相互作用和弱相互作用的电子性质都有许多相似之处和不同之处。所有这些都导致人们更好地了解了这些相互作用的电子性质,以及它们在逻辑上如何以结晶态自我分布。

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