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Metal-organic frameworks (MOFs) were prepared by a reaction of 4,4'-(diazene-1,2-diyl)dibenzoic acid (AzDC) as organic ligand and metal ions including zinc, iron (III), copper, and cobalt ions, respectively. Because the synthesized AzDC contained azobenzene and carboxylic acids groups at each ends, it showed trans-to-cis photoisomerization upon UV irradiation and interaction with metal ions, respectively. The AzDC showed more efficient photoisomerization upon exposure to UV light (365 nm), rather than UV light at 254 nm, mainly due to the larger absorption around 365 nm than 254 nm. The isomerization of cis-to-trans azobenzene was observed under ambient light. The resultant MOFs containing AzDC ligand showed photo-triggered conversion of trans- to cis-azobenzene after exposure to UV light. Thus, the porous structure and photo-induced dimensional deformation of the MOFs enable to use in chemical sensing, gas separation, gas storage, catalysis, and drug delivery.
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