Photoelectromagnetic Responsive Adaptive Porous Frameworks through Dynamic Covalent Chemistry of Tetraarylethylene‐backboned Aryldicyanomethyl Radicals
A macrocyclic trimer-based dynamic framework with a complex 3D channel network has been constructed through reversible dynamic covalent linking chemistry of tetraarylethylene-backboned aryldicyanomethyl radical building blocks. Due to the conformational dynamics and radical-mediated reaction dynamics, the system shows macroscopic responsiveness in terms of light absorption, photoluminescence, and magnetic properties.
Dynamic materials undergoing adaptive solid-state transitions are attractive for soft mechanics and information technology. Here, we report a novel porous framework system based on macrocyclic trimers assembled from open-shell tetraarylethylene building blocks with aryldicyanomethyl radicals as coupling linkers. Under mechanical, thermal, or chemical stimuli, the framework showed adaptability by activating conformational dynamics and radical-based transformations, thus displaying macroscopic responsiveness in terms of light absorption, luminescence, and magnetism. We studied the dynamic processes by variable-temperature nuclear magnetic resonance (VT-NMR), variable-temperature electron spin resonance (VT-ESR), and superconducting quantum interference device (SQUID) measurement and further established a proof-of-concept application for multi-modal information encryption. The strategy may open avenues for rational design of solid-state photoelectromagnetic dynamic materials by merging dynamic covalent coupling chemistry and functional aggregation principles.Zum Volltext
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