Light-Controlled Destruction and Assembly: Switching between Two Differently Composed Cage-Type Complexes |
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Authors: | Daniel Hugenbusch Marc Lehr Jan-Simon von Glasenapp Prof Dr Anna J McConnell Prof Dr Rainer Herges |
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Institution: | Otto-Diels-Institute of Organic Chemistry, Christian-Albrechts-Universität zu Kiel, Otto-Hahn-Platz 4, 24118 Kiel, Germany |
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Abstract: | We report on two regioisomeric, diazocine ligands 1 and 2 that can both be photoswitched between the E- and Z-configurations with violet and green light. The self-assembly of the four species ( 1 -Z, 1 -E, 2 -Z, 2 -E) with CoII ions was investigated upon changing the coordination vectors as a function of the ligand configuration (E vs Z) and regioisomer ( 1 vs 2 ). With 1 -Z, Co2( 1 -Z)3 was self-assembled, while a mixture of ill-defined species (oligomers) was observed with 2 -Z. Upon photoswitching with 385 nm to the E configurations, the opposite was observed with 1 -E forming oligomers and 2 -E forming Co2( 2 -E)3. Light-controlled dis/assembly was demonstrated in a ligand competition experiment with sub-stoichiometric amounts of CoII ions; alternating irradiation with violet and green light resulted in the reversible transformation between Co2( 1 -Z)3 and Co2( 2 -E)3 over multiple cycles without significant fatigue by photoswitching. |
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Keywords: | Diazocine Isomerization Photochemistry Self-Assembly Supramolecular Chemistry |
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