Volume 35, Issue 12 e6431
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Metal–organic frameworks based on a benzimidazole flexible tetracarboxylic acid: Selective luminescence sensing Fe3+, magnetic behaviors, DFT calculations, and Hirshfeld surface analyses

Xiaoyu Zhang

Xiaoyu Zhang

School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, China

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Dingqi Xiong

Dingqi Xiong

School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, China

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Pengkun Fu

Pengkun Fu

School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, China

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Meng Yun

Meng Yun

School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, China

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Qinglin Yang

Qinglin Yang

School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, China

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Mei-Mei Jia

Mei-Mei Jia

School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, China

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Xiuyan Dong

Corresponding Author

Xiuyan Dong

School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, China

Correspondence

Xiuyan Dong, School of Chemical and Biological Engineering, Lanzhou Jiaotong University. Lanzhou 730070, China

Email: [email protected]

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First published: 05 September 2021
Citations: 12

Funding information: Tianjin University-Lanzhou Jiaotong University Independent Innovation Fund Cooperation Project, Grant/Award Number: 2020060; Natural Science Foundation of Gansu Province, Grant/Award Number: 20JR5RA425; Research Projects of Colleges and Universities in Gansu Province, Grant/Award Number: 2019A-032

Abstract

Four novel metal–organic frameworks constructed from benzimidazole flexible tetracarboxylic acid ligand, 1-(3,5-dicarboxylbenzyl)-1H-benzimidazole-5,6-dicarboxylic acid (H4L), have been prepared by a solvothermal method in the presence of N-donor ancillary ligands (1,10-phen = 1,10-phenanthroline monohydrate, 4,4′-bibp = 1,4-di[pyridine-4-yl]benzene), namely, [Co2(L)(H2O)3]n (1), {[Cd2(L)(1,10-phen)(H2O)]·2H2O}n (2), {[Co4(L)2(4,4′-bibp)2(H2O)7]·4H2O}n (3), and {[Ni4(L)2(4,4′-bibp)2(H2O)7]·4H2O}n (4). Complexes 1 and 2 show a 3D supramolecular structure and crystallize in monoclinic space group P21/c. Complexes 3 and 4 are isomorphous and crystallize in monoclinic space group Pn, and the respective metals exhibit a similar coordination environment. The H4L ligand behaved in different coordinated modes in Complexes 1–4, namely, μ6111011111 in 1, μ6111111211 in 2, there are two coordination modes (μ5011011101 and μ5111011101) in 3 and 4. Furthermore, photoluminescence and magnetic properties have been studied. The results indicate that Complexes 3 and 4 show strong antiferromagnetic and ferromagnetic coupling through M–O–C–O–M interactions, respectively. In particular, Complex 2 can sensitively and selectively detect Fe3+ in aqueous systems, and the limit of detection (LOD) values of Fe3+ is ∼0.19 mM.

CONFLICT OF INTEREST

The authors declare no competing financial interests.

DATA AVAILABILITY STATEMENT

The data that support the findings of this study are available in the supplementary material of this article.

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