Abstract
A monocyclic organic ligand 5-aminoisophthalic acid (H2APA) with one amino and two carboxylic groups, has been employed to construct a stable Zn-based metal-organic framework, ZnAPA. It features a 3D supramolecular network containing the pores with a size of 8.2 Å and uncoordinated carboxylic oxygen atoms, exhibiting a pronounced fluorescence response (fast response, high sensitivity and selectivity) to Hg2+ ion over other metal ions in aqueous solution. The possible fluorescence-based sensing mechanism is also involved. Importantly, ZnAPA shows extraordinary acid-base resistant stability, highlighting its potential use for detection of Hg2+ in practical applications.
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