Abstract
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 ZnII and LaIII cations to generate a heterobimetallic tetrahedral capsule. The LaIII cations each template three imine bonds that hold together a 3-fold-symmetric metallo-ligand, defining the center of each tetrahedron face. The ZnII cations occupy the other ends of these C3 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 ReO4-, the encapsulation of which also resulted in the quenching of capsule fluorescence.
Highlights
With the aim of expanding the scope of subcomponent self-assembly8c to encompass the formation of new heterometallic architectures, we designed subcomponent A (Scheme 1) to simultaneously coordinate lanthanide and dblock ions, selectively
We hypothesized that imine condensation around a larger lanthanide template might generate a trimeric macrocycle, which would array the triazole(pyridine) sites so as to coordinate to zinc(II) centers at the vertices of a face-capped tetrahedron
This hypothesis was confirmed in the synthesis of capsule 1
Summary
Resonance Imaging. J. Am. Chem. Soc. 2020, 142, 16409-16419. (a) Aboshyan-Sorgho, L.; Nozary, H.; Aebischer, A.; Bünzli, J.-C. G.; Morgantini, P.-Y.; Kittilstved, K. R.; Hauser, A.; Eliseeva, S. V.; Petoud, S.; Piguet, C., Optimizing Millisecond Time Scale Near- Complexes. J. Am. Chem. Soc. 2012, 134, 12675-12684; (b) Glover, P. B.; Ashton, P. R.; Childs, L. J.; Rodger, A.; Kercher, M.; Williams, R.
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