101. Two porous three-dimensional (3D) metal–organic frameworks based on diverse metal clusters: selective sensing of Fe3+ and Cr2O72−.
- Author
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Yan, Yang-Tian, Wu, Yun-long, Zheng, Li-Na, Wei-Cai, Tang, Peng-Fei, Wu, Wei-Ping, Zhang, Wen-Yan, and Wang, Yao-Yu
- Subjects
METAL clusters ,METAL-organic frameworks ,LUMINESCENCE quenching ,POROSITY ,BENZOIC acid ,POROUS metals - Abstract
Two porous complexes, namely, {[H
2 N(Me)2 ]2 [Zn5 (L)2 (OH)2 ]·3DMF·4H2 O}n (1), and {[H2 N(Me)2 ]4 [Cu3 (L)2 (H2 O)2 ]·4DMF·3H2 O}n (2) were solvothermally constructed based on a symmetrical V-shaped rigid multicarboxylic acid ligand H5 L (H5 L = 3,5-di(2′,5′-dicarboxylphenyl)benzoic acid). Complexes 1 and 2 display 3D frameworks with various metal clusters. Complex 1 is a 3D porous framework with a (4,8)-connected topology featuring a 1D pore structure in the a-axis direction with a penta-nuclear cluster [Zn5 (μ2 -COO)6 (μ1 -COO)4 (μ3 -O)2 ]. By contrast, 2 displays a 3D (3,4)-connected net based on binuclear [Cu2 (COO)4 ] paddlewheel SBUs. Complex 1 reveals solid-state luminescent properties at ambient temperature, and the maximum emission peak was observed at ∼443 nm (λex = 339 nm). Meanwhile, 1 shows high selectivity and sensitivity not only for Fe3+ cations but also for Cr2 O7 2− anions via the luminescence quenching effect with a low detection limit, which thus could be a potential crystalline material for detecting these substances. The mechanisms of the quenching effect and sensing properties of 1 were discussed in detail. [ABSTRACT FROM AUTHOR]- Published
- 2022
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