QTAIM analysis. The low rotational barriers about the =С–С= and =C–O– bonds in monomers provide ease of their transitions and simultaneous participation in the formation of dimers. The calculated dissociation energies of dimers depend on the structural features of the conformers and PA values of the carbonyl oxygen. The cyclic dimers with three and two intermolecular N–H⋯O C bonds are the most stable
摘要 β-氧-双-
丙烯酰胺O(CH=CHCONR1R2)2 的构象异构体及其二聚体采用NBO 和QTAIM 分析的DFT 方法计算。单体中 =С-С= 和 =C-O- 键的低旋转势垒使它们易于转变并同时参与二聚体的形成。二聚体的计算解离能取决于构象异构体的结构特征和羰基氧的 PA 值。具有三个和两个分子间 N-H⋯OC 键的环状二聚体是最稳定的。分析了孤对氮与羰基的轨道相互作用对构象异构体的质子亲和力的影响。在比较 FTIR 光谱和计算数据时,在固态和溶液中分析了化合物及其二聚体的结构。β-oxy-bis-N 的 X 射线分析,