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Three iridium (III) -based metal–organic frameworks (MOFs), namely Cd 3 Ir (ppy-COO) 3 2 (DMF) 2 (H 2 O) 4 ·6H 2 O·2DMF (1), Cd 3 Ir (ppy-COO) 3 2 (DMA) 2 (H 2 O) 2 ·0. 5H 2 O·2DMA (2), and Cd 3 Ir (ppy-COO) 3 2 (DEF) 2 (H 2 O) 2 ·8H 2 O·2DEF (3) (ppy-COOH = methyl-3- (pyridin-2-yl) benzoic acid, DMF = N, N -dimethylformamide, DMA = N, N -dimethylacetamide, DEF = N, N -diethylformamide), have been synthesized and characterized. Single-crystal structural determinations reveal that compounds 1 – 3 are isostructural, showing a three-dimensional framework structure with (3, 6) connected rtl topologyin whose trimers of Cd 3 (COO) 6 are cross-linked by Ir (ppy-COO) 3 3–. The structures are completely different from those of other Ir (III) -based MOFs. Compound 1 was selected for a detailed study on sensing properties. The excellent luminescence as well as good water stability of 1 makes it a highly selective and sensitive multiresponsive luminescent sensor for Fe 3+ and Cr 2 O 7 2–. The detection limits are 67. 8 and 145. 1 ppb, respectively. Compound 1 can also be used as an optical sensor for selective sensing of adenosine triphosphate (ATP 2–) over adenosine diphosphate (ADP 2–) and adenosine monophosphate (AMP 2–) in aqueous solution. This is the first example of iridium (III) -based MOFs for the optical detection of Fe 3+, Cr 2 O 7 2–, and ATP 2–. More interestingly, the luminescent composite film doped with 1% (w/w) of compound 1, 1@PMMA (PMMA = poly (methyl methacrylate) ), can be successfully prepared, which endows efficient sensitivity for Fe 3+ and Cr 2 O 7 2– detection and thus provides great potential for future applications.
Fan et al. (Wed,) studied this question.