作者:Gen Zhang、Guzmán Gil-Ramírez、Augustinas Markevicius、Colm Browne、Iñigo J. Vitorica-Yrezabal、David A. Leigh
DOI:10.1021/jacs.5b07069
日期:2015.8.19
the use of only (R,R)-1 leads solely to a trefoil knot of Λ-handedness, whereas (S,S)-1 forms the Δ-trefoil knot with complete stereoselectivity. The knots and their isomeric unknot macrocycles were characterized by NMR spectroscopy, mass spectrometry, and X-ray crystallography and the expression of the chirality that results from the topology of the knots studied by circular dichroism.
我们报告了具有关于镧系金属离子 (Ln(3+)) 模板的点手性的 2,6-吡啶二甲酰胺配体 (1) 的组装,其中共价捕获所得缠绕的 3:1 配体:金属配合物的螺旋手性通过闭环烯烃复分解形成单手性的拓扑手性分子三叶结。配体不会自我分类(外消旋配体形成均配和杂配镧系元素配合物的近乎统计的混合物),但仅使用 (R,R)-1 仅导致 Λ 手性的三叶结,而 (S ,S)-1 形成具有完全立体选择性的 Δ-三叶结。通过核磁共振光谱、质谱、