Self-Assembled Pentamers and Hexamers Linked through Quadruple-Hydrogen-Bonded 2-Ureido-4[1H]-Pyrimidinones
作者:Henk M. Keizer、Juan J. González、Margarita Segura、Pilar Prados、Rint P. Sijbesma、E. W. Meijer、Javier de Mendoza
DOI:10.1002/chem.200500329
日期:2005.8.5
The preorganization of bifunctional 2-ureido-4-pyrimidinones mediated by either 1,3-substituted adamantane or meta-substituted phenylene ring linkers leads to the preferred formation of stable pentameric (1)(5) and hexameric (2)(6) assemblies, respectively. Despite the high binding constant of the 2-ureido-4-pyrimidinone dimers and the highly preorganized structure of the monomer, the predominant formation
由1,3-取代的金刚烷或间位取代的亚苯基环接头介导的双功能2-脲基4-嘧啶酮的预组织导致稳定的五聚体(1)(5)和六聚体(2)(6)组装体的优选形成, 分别。尽管2-ureido-4-pyrimidinone二聚体的结合常数高且单体的结构高度组织化,但溶液中循环(1)(5)和(2)(6)的主要形成仅在特定浓度下发生范围。