Synthesis, crystal structures and spectral characterization of imidazo[1,2-a]pyrimidin-2-yl-acetic acid and related analog with imidazo[2,1-b]thiazole ring
作者:Agnieszka Dylong、Waldemar Goldeman、Michał Sowa、Katarzyna Ślepokura、Piotr Drożdżewski、Ewa Matczak-Jon
DOI:10.1016/j.molstruc.2016.03.055
日期:2016.8
Energy Distribution (PED) analysis of computed normal vibrations. Special attention was paid on hydroxyl and methylene groups involved in hydrogen bonds, which vibrations were monitored by H/D substitution. Recrystallization of parent compounds from deuterium oxide (D 2 O) solutions resulted in deuteration of their carboxylic OH groups and almost complete deuteration of H IPM-2-ac methylene group.
摘要 合成了咪唑并[1,2-a]嘧啶-2-基乙酸(H IPM-2-ac )及其带有咪唑并[2,1-b]噻唑环的类似物(H ITZ-6-ac ),并结构特征由单晶 X 射线衍射证实,Hirshfeld 表面的计算提供了对构成两种晶体的分子间相互作用的详细了解。借助密度泛函理论 (DFT) 计算和计算法向振动的势能分布 (PED) 分析,记录并详细解释了 H IPM-2-ac 和 H ITZ-6-ac 的红外和拉曼光谱。特别关注参与氢键的羟基和亚甲基,它们的振动通过 H/D 取代进行监测。从氧化氘 (D 2 O) 溶液中重结晶母体化合物导致其羧基 OH 基团的氘化和 H IPM-2-ac 亚甲基基团的几乎完全氘化。后一种现象清楚地反映在振动光谱中,并由溶液中的 1 H NMR 实验证实。