Hg is highly toxic and can cause serious harm to the environment and humans. Thus, it is vital to develop efficient Hg sensors. In this work, a LMOF-based (LMOF = luminescent metal-organic framework) "turn-on" Hg sensor () is first developed by an aggregation-induced emission (AIE) functional ligand. with a formula of [Cd()(NDA)(HO)()(MeOH)] ( = 4,4'-((2,7-di--butyl-9-fluoren-9-ylidene)-methylene)dipyridine; HNDA = 1,4-naphthalenedicarboxylic acid) exhibits a unique (3,4)-connected 2-D framework with 3-connected Cd1, 4-connected [Cd(COO)] cluster, and and NDA bridges. The fluorene rings of in stack in a back-to-back manner. has excellent water, pH, and thermal stabilities and can "turn-on" detect Hg with ultrahigh sensitivity, good selectivity, and recyclability in a water medium. Furthermore, shows obvious naked-eye-visible emission change and an extremely fast sensing response toward Hg (<1 S) and can maintain its enhanced intensity over 5 min. The test paper is developed for practical "turn-on" Hg sensing application. The "turn-on" Hg sensing mechanism of is discussed in detail.
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