Abstract
Catenated cages represent chemistry’s challenging synthetic targets because a three-dimensional assembly is necessary for their formation. Herein, a cyclic bis[2]catenane is constructed through the coordination-driven self-assembly of the interlocked bis-metallacage, by the 90° Pt(II) heteroligation of the endo-functionalized double-bridged tweezer bearing pyridyl moieties and the tetra-carboxylated linker. NMR spectrometry, X-ray crystallography and mass spectrometry confirm the formation of a cyclic bis[2]catenane with “∞”-shaped topology via a 14-component self-assembly. Particularly, reversibly responsive transformation between the bis[2]catenane and the bis-metallacage can be realized by guest exchange, concentration effect and solvent effect. This work represents a novel example of a cyclic cage-based [2]catenane oligomer.
Highlights
Catenated cages represent chemistry’s challenging synthetic targets because a threedimensional assembly is necessary for their formation
The resulting structure of interpenetrated cyclic bis[2]catenane metallacage with “∞”-shaped topology is characterized by NMR spectrometry, single crystal Xray diffraction analysis and mass spectrometry
Due to the guest exchange, concentration effect, and solvent effect, the supramolecular coordination complexes (SCCs) could be reversibly transformed between the bis-metallacage and the cyclic catenated structure
Summary
Catenated cages represent chemistry’s challenging synthetic targets because a threedimensional assembly is necessary for their formation. The resulting structure of interpenetrated cyclic bis[2]catenane metallacage with “∞”-shaped topology is characterized by NMR spectrometry, single crystal Xray diffraction analysis and mass spectrometry. Due to the guest exchange, concentration effect, and solvent effect, the SCCs could be reversibly transformed between the bis-metallacage and the cyclic catenated structure.
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