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Visible‐Light‐Responsive Self‐Assembled Complexes: Improved Photoswitching Properties by Metal Ion Coordination

Von Wiley-VCH zur Verfügung gestellt

A photoswitchable ligand and PdII combine to form a [Pd2 L 4]4+ coordination cage. The photoswitching selectivity towards the metastable isomer is significantly improved when coordinated, allowing near-quantitatively photoswitching to a new species, [PdL 2]2+. This new species stabilizes the metastable isomer, increasing the thermal half-life compared to the free ligand.


Abstract

A photoswitchable ligand based on azobenzene is self-assembled with palladium(II) ions to form a [Pd2(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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