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Investigating unused hydrogen bond acceptors using known and hypothetical crystal polymorphism

机译:使用已知和假设的晶体多态性研究未使用的氢键受体

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摘要

The crystal structures found in a manual search for polymorphs are discussed in conjunction with low energy crystal structures found in a computational search for minima in the lattice energy, for barbituric acid, cyanuric acid, alloxan, parabanic acid, and urazole. Since all these molecules, with the exception of urazole, have crystal structures in which there are carbonyl groups not used in conventional hydrogen bonding, these results and the electrostatic properties of the molecules are used to interpret this unusual behavior. It appears that there is no great difference between the strengths of the various N-H donors and C=O acceptors within these molecules, and the observed crystal structures result from the compromise between the intermolecular interactions of the molecules.
机译:讨论了在手动搜索多晶型物中发现的晶体结构,以及在计算搜索中发现巴比妥酸,氰尿酸,四氧嘧啶,对羟基苯甲酸和尿嘧啶的晶格能量最小值时发现的低能晶体结构。由于所有这些分子(除了尿嘧啶以外)都具有晶体结构,在该晶体结构中存在常规氢键未使用的羰基,因此这些结果和分子的静电性质可用于解释这种异常行为。在这些分子中,各种N-H供体和C = O受体的强度之间似乎没有太大差异,并且观察到的晶体结构是由分子间相互作用之间的折衷产生的。

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