Self-Assembly of Tris(2-ureidobenzyl)amines: A New Type of Capped, Capsule-Like Dimeric Aggregates Derived from a Highly Flexible Skeleton
作者:Mateo Alajarín、Aurelia Pastor、Raúl-Ángel Orenes、Jonathan W. Steed、Ryuichi Arakawa
DOI:10.1002/chem.200305559
日期:2004.3.19
A set of tris(2-ureidobenzyl)amines 3 was prepared and their dimerization processes thoroughly investigated. In spite of their inherent flexibility, tris(ureas) 3 form dimeric aggregates both in the solid state and in solution. Evidence for the existence of these dimeric species was provided by a combination of techniques (X-ray analysis, NMR and IR spectroscopy, and ESI-MS). The association constants
制备了一组三(2-脲基苄基)胺3,并对它们的二聚过程进行了彻底的研究。尽管具有固有的柔韧性,但三(脲)3在固态和在溶液中均形成二聚体聚集体。通过结合多种技术(X射线分析,NMR和IR光谱以及ESI-MS)提供了这些二聚体物种存在的证据。确定了选定的三(脲)二聚过程的缔合常数和热力学参数,表明它们是由焓驱动的。溶液中的异二聚化实验显示出高度的自我识别或自恋自我分类。另一方面,取决于每个脲官能团的末端取代基,衍生自3的脱对称的三(脲)具有适度的区域选择性的自组装。