Molecularly structured smart materials with remote-controllable properties and functionalities attract particular attention and may enable advanced functions. It is well recognized that photo-switchable ligands impart remarkable properties to their metal complexes. In this context, metal-containing arylazopyrazole molecular switches offer new opportunities for variation in photochromic behavior and the possibility of combing the specific properties of the metal Centre and the optical response of the photochromic group. Herein, we report a series of metal containing photo-switchable click derived bidentate arylazopyrazolyl-1,2,3-triazole ligands displaying varying photochromic behavior. The photochromic properties of the ligands and metal complexes are tunable by variation of the ancillary ligands and structurally characterized. Upon irradiation with alternating UV and green light, both the free ligands and their complexes undergo efficient reversible trans-to-cis photo-isomerization. The results also revealed that binding of the metal ions reduces both the photo-isomerization rates and the concentration of the cis isomer at the photo-stationary state. The effect of the nature of the substituents of the arylazopyrazole ligand structure on the reversible trans-to-cis isomerization processes of both the free ligands and their metal complexes has also been explored and the results of our findings will be discussed.

Photo-switchable metal containing click derived arylazopyrazole ligands

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

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