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A novel 3D metal-organic framework (MOF){[Tb 3 (CBA) 2 (HCOO)(μ 3 -OH) 4 (H 2 O)]·2H 2 O·0.5DMF} n (S-1) was synthesized by the solvothermal method. The crystal structure indicates that [Tb 4 O 4 ] cubane clusters self-assemble into an infinite chain by sharing vertex, which is further linked to adjacent chains through 1,1-cyclobutanedicarboxylic acid ligand (H 2 CBA), resulting in a honeycomb arrayed framework. S-1 possesses excellent water stability and still retains intact structure after exposure to water for 10 weeks or boiling water for 10 weeks. Interestingly, S-1 acts as a luminescence sensor to selectively and sensitively detect quercetin with the limit of detection (LOD) as low as 0.23 ppm (7.6 × 10 -7 M). The relationship between relative luminescence intensity and concentration obeys linear in the range of 0-300 ppm (0-993 μM), which allows quantitative detection of quercetin. Importantly, S-1 can be reused at least six times with almost no change in luminescent intensity. Compared with the high performance liquid chromatography-mass spectrometry (HPLC-MS) method, S-1 was used to determine the content of quercetin in onionskin and apple peel samples with satisfactory results. Furthermore, a portable S-1 test paper is also developed and expected to be applied in practice. To our knowledge, S-1 is the first example of MOFs as luminescent sensor for quercetin.

Water Stable [Tb4] Cluster-Based Metal–Organic Framework as Sensitive and Recyclable Luminescence Sensor of Quercetin

Water Stable [Tb₄] Cluster-Based Metal–Organic Framework as Sensitive and Recyclable Luminescence Sensor of Quercetin