Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, United Kingdom.
Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an 710069, China.
J Am Chem Soc. 2020 Nov 25;142(47):19856-19861. doi: 10.1021/jacs.0c09991. Epub 2020 Nov 10.
An organic subcomponent was designed with 2-formyl-8-aminoquinoline and triazole-pyridine ends. The relative orientations and geometries of these two ends enabled this subcomponent to assemble together with Zn and La cations to generate a heterobimetallic tetrahedral capsule. The La cations each template three imine bonds that hold together a 3-fold-symmetric metallo-ligand, defining the center of each tetrahedron face. The Zn cations occupy the other ends of these axes, defining the vertices of the tetrahedron. This is the first example where subcomponent self-assembly brought into being the faces of a polyhedron, as opposed to the vertices. Host-guest studies show positively cooperative binding toward ReO, the encapsulation of which also resulted in the quenching of capsule fluorescence.
设计了一种含有 2-醛基-8-氨基喹啉和三唑-吡啶端基的有机亚组分。这两个端基的相对取向和几何形状使得该亚组分能够与 Zn 和 La 阳离子组装在一起，生成一个杂双金属四面体型胶囊。La 阳离子各自模板三个亚胺键，将一个 3 重对称的金属配体连接在一起，定义了每个四面体面的中心。Zn 阳离子占据这些轴的另一端，定义了四面体的顶点。这是首例亚组分自组装形成多面体面而不是顶点的例子。主客体研究表明，它对 ReO 具有正协同结合作用，包封 ReO 也导致胶囊荧光猝灭。
