Visible-Light-Responsive Self-Assembled Complexes: Improved Photoswitching Properties by Metal Ion Coordination
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION(2022)
Abstract
A photoswitchable ligand based on azobenzene is self-assembled with palladium(II) ions to form a [Pd-2(E-L)(4)](4+) cage. Irradiation with 470 nm light results in the near-quantitative switching to a monomeric species [Pd(Z-L)(2)](2+), which can be reversed by irradiation with 405 nm light, or heat. The photoswitching selectivity towards the metastable isomer is significantly improved upon self-assembly, and the thermal half-life is extended from 40 days to 850 days, a promising approach for tuning photoswitching properties.
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Key words
Metal-Template, Molecular Cage, Non-Equilibrium, Photoswitch, Self-Assembly
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