Helical Supramolecular Aggregates Based on Ureidopyrimidinone Quadruple Hydrogen Bonding
作者:J. H. K. Ky Hirschberg、Rolf A. Koevoets、Rint P. Sijbesma、E. W. Meijer
DOI:10.1002/chem.200204495
日期:2003.9.5
Dodecane solutions of compounds 3, 4 b, and 7 b display a Cotton effect at the absorption band of the phenyl-pyrimidinone unit. Amplification of chirality was observed in mixtures of 7 a and 7 b, but not in mixtures of 4 a and 4 b, indicating that 7 a and 7 b form mixed polymeric aggregates with a helical architecture in dodecane solution, whereas 4 a and 4 b do not. The Cotton effect is lost upon increasing