Self-Assembly of Ureido-Pyrimidinone Dimers into One-Dimensional Stacks by Lateral Hydrogen Bonding
作者:Marko M. L. Nieuwenhuizen、Tom F. A. de Greef、Rob L. J. van der Bruggen、Jos M. J. Paulusse、Wilco P. J. Appel、Maarten M. J. Smulders、Rint P. Sijbesma、E. W. Meijer
DOI:10.1002/chem.200902107
日期:2010.2.1
with an additional urea functionality self‐assemble into one‐dimensional stacks in various solvents through lateral non‐covalent interactions. 1H NMR and DOSY studies in CDCl3 suggest the formation of short stacks (<10), whereas temperature‐dependent circular dichroism (CD) studies on chiral UPy dimers in heptane show the formation of much larger helical stacks. Analysis of the concentration‐dependent
通过额外的非共价相互作用,被其他尿素官能团取代的Ureido-嘧啶酮(UPy)二聚体在各种溶剂中自组装成一维堆栈。在CDCl 3中的1 H NMR和DOSY研究表明形成了短的烟囱(<10),而对庚烷中手性UPy二聚体的温度依赖性圆二色性(CD)研究表明,形成了更大的螺旋烟囱。CDCl 3中化学位移的浓度依赖性演变分析庚烷中随温度变化的CD效应表明,这种自组装过程在两种溶剂中均遵循等渗途径。聚集体的长度受与脲官能团连接的取代基的影响。与之形成鲜明对比的是,带有一个额外的氨基甲酸酯基团的UPy二聚体不会自组装成有序堆,这从庚烷中不存在CD效应以及CDCl 3中嘧啶酮环的亚烷基质子的浓度无关化学位移可以明显看出。