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Post-synthetic Modification of a Two-Dimensional Metal–Organic Framework via Photodimerization Enables Highly Selective Luminescent Sensing of Aluminum(III)

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journal contribution
posted on 11.10.2018, 18:50 by Wu-Xiang Li, Jia-Hui Gu, Hong-Xi Li, Ming Dai, David James Young, Hai-Yan Li, Jian-Ping Lang
Reaction of Cd­(NO3)2·4H2O with 5-fluoro-1,3-bis­[2-(4-pyridyl)­ethenyl]­benzene (5-F-1,3-bpeb) and 1,3-benzene­dicarboxylic acid (1,3-H2­BDC) under the solvothermal conditions gave rise to a two-dimensional metal–organic framework (MOF) [{Cd2­(5-F-1,3-bpeb)2­(1,3-BDC)2}·0.5DMF·2H2O]n (1). Compound 1 was postmodified by a photodimerization reaction between 5-F-1,3-bpeb ligands to yield [{Cd2­(syn-dftpmcp)­(1,3-BDC)2}·0.5DMF·H2O]n (syn-dftpmcp = syn-3,4,­12,13-tetrakis­(4-pyridyl)-8,17-bisfluoro-1,2,­9,10-diethano­[2.2]­metacyclophane) (2). Compounds 1 and 2 have 2D networks built from linking one-dimensional [Cd2­(1,3-BDC)2]n chains via 5-F-1,3-bpeb or syn-dftpmcp bridges. After such a post-synthetic modification, compound 2, relative to 1, can probe Al3+ by using a luminescent quenching approach with much higher selectivity and sensitivity.