Close insight into the nature of intermolecular interactions in dihydropyrimidine-2(1H)-thione derivatives
作者:Aamer Saeed、Ulrich Flörke、Adolfo Fantoni、Asma Khurshid、Hiram Pérez、Mauricio F. Erben
DOI:10.1039/c6ce02619b
日期:——
4-dihydropyrimidine-2(1H)-thione derivatives [R = 2-chloro (1), 2,3-di-chloro (2), 2,4-di-methyl (3), and 4-methoxy (4)] were determined and analysis of their molecular conformations was carried out. A comparative study of the intermolecular interactions—including eight closely related structures from CSD—was performed and the degree of isostructurality was quantified. The intermolecular interactions were characterized
四个1-(R-苯基)-4,4,6-三甲基-3,4-二氢嘧啶-2(1 H)-硫酮衍生物的晶体结构[ R = 2-氯(1),2,3-二-氯(2),2,4-二甲基(3)和4-甲氧基(4)]的测定及其分子构象进行了分析。进行了分子间相互作用的比较研究,包括来自CSD的八个紧密相关的结构,并对同构性的程度进行了量化。分子间的相互作用用周期系统电子密度来表征,拓扑分析突出了N–H⋯S的作用C氢键在不同的超分子结构的稳定中。PIXEL晶格能量的计算表明,色散成分是主要的贡献者,而库仑项对总能量的重要作用也很重要。涉及N–H⋯S C氢键的分子对的相互作用能表明库仑组分对堆积稳定性的主要贡献。Hirshfeld表面和指纹图使我们能够可视化不同的分子间接触及其对每种化合物对总表面的相对贡献。静电势(ESP)的分析与计算出的能量密切相关,从而表征了不同相互作用的强度。