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• A composite material Cu-BTC@H4TBAPy assembled by Cu-BTC and H4TBAPy. • Superior luminescence property shows potential applications in fluorescence sensing. • A role of fluorescent sensor switch in recognition of Al3+ and Fe3+. A kind of metal organic framework composite material was prepared by encapsulating chemical chromophore the 1,3,6,8-tetrakis(p-benzoic acid)pyrene (H 4 TBAPy) in Cu-BTC which has the large square-shaped pores, a reasonable degree of thermal stability and a capacity for chemical functionalization of the channel linings. Cu-BTC@H 4 TBAPy has superior luminescence performance than framework material Cu-BTC (H 3 BTC = 1, 3, 5-trimellitic acid). Base on its luminescence property, we performed fluorescence sensing experiments on heavy metal ions. The results show that the metal ion Fe3+ has a significant turn-off effect on Cu-BTC@H 4 TBAPy, while Al3+ has a significant turn-on effect on Cu-BTC@H 4 TBAPy. This indicates that Cu-BTC@H 4 TBAPy can play a role of fluorescent sensor switch in recognition of different ions. [Display omitted] [ABSTRACT FROM AUTHOR]

1 A new Ln-BTC-Ac-FM framework intelligent materials 2 High sensitivity and selectivity to UO 2 2+ in aqueous solution. 3 Better adsorption effects on Coomassie Brilliant Blue (CBB) and Eosin The unique fluorescence properties of rare earth ions and subtle interactions with organic ligands make the target lanthanide metal-organic frameworks show potential development prospects in many fields. Based on this situation, a series of new lanthanide metal-organic frameworks Ln-BTC-AC-FM: (CH 3) 2 NH 2 [Ln 2 (BTC)(AC) 3 (FM)], (Ln=Pr (1), Ce (2), Nd (3), Eu (4), Sm (5), Gd (6), Tb (7), Ho (8), Er (9) and Yb (10), H 3 BTC=1,3,5-benzenetricarboxylic acid) were synthesized through the reaction of triangular polycarboxylic acid ligand (H 3 BTC) and rare earth nitrate Ln(NO 3) 3 ·6H 2 O with mixed formic acid (FM) and glacial acetic acid (AC) system. Due to this new type of Ln-BTC-AC-FM MOFs have unique and excellent fluorescence properties, we selected (CH 3) 2 NH 2 [Eu 2 (BTC)(AC) 3 (FM)] (4) to explore its detection performance for UO 2 2+ in aqueous solution. The study found that 4 is a high-efficiency fluorescent probe, which has a good quenching effect on uranium solution, and the quenching rate can reach 98.01%. At the same time, 4 has a good fluorescent response to UO 2 2+, with a higher K SV value of 8.56 × 103 M−1 and a lower detection limit of 4.12 μM. In addition, we also studied the adsorption properties of this series of Ln-BTC-AC-FM MOFs for dyes because of their novel three-dimensional microporous structures. The results showed that 4 has a good adsorption effect on Coomassie Brilliant Blue (CBB) and Eosin. Moreover, it was found that the dye adsorption process was proved to be a suitable pseudo-second-order kinetic model. [Display omitted] [ABSTRACT FROM AUTHOR]