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Issue 5, 2018
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Four new metal–organic frameworks based on diverse secondary building units: sensing and magnetic properties

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Abstract

Four new metal–organic frameworks (MOFs), {[Zn3(L)(OH)(H2O)5]·NMP·2H2O}n (1), {[H2N(Me)2][Zn2(L)(H2O)]·DMF·H2O}n (2), {[Co5(L)2(H2O)11]·2H2O}n (3) and {[Mn5(L)2(H2O)12]·6H2O}n (4), were assembled employing a symmetrical V-shaped rigid multicarboxylic acid ligand H5L (H5L = 2,4-di(3′,5′-dicarboxylphenyl)benzoic acid) with different metal ions, resulting in versatile frameworks as well as various types of coordination modes of H5L. 1 forms a three-dimensional (3D) 4-connected sra net based on trinuclear [Zn33-OH)(μ2-COO)(μ1-COO)4] clusters, while 2 displays a 3D (4,6)-connected net based on two types of binuclear [Zn22-COO)21-COO)4] and [Zn22-COO)4] clusters. 3 and 4 contain similar [M32-COO)41-COO)2] (3, M = Co; 4, M = Mn) clusters but result in different 4-connected 3D and 2D frameworks, respectively. 1 and 2 show solid-state luminescence properties at ambient temperature. Meanwhile, 1 shows high selectivity and sensitivity for not only Fe3+ cations but also for CrO42−, Cr2O72− and MnO4 anions via a luminescence quenching effect with a low detection limit, which thus means that it could be a potential crystalline material for detecting these anions. The mechanisms of the quenching effect and sensing properties of 1 are discussed in detail. In addition, 3 and 4 have the presence of antiferromagnetic interactions between the metal ions.

Graphical abstract: Four new metal–organic frameworks based on diverse secondary building units: sensing and magnetic properties

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Publication details

The article was received on 12 Dec 2017, accepted on 26 Dec 2017 and first published on 27 Dec 2017


Article type: Paper
DOI: 10.1039/C7DT04696K
Citation: Dalton Trans., 2018,47, 1682-1692
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    Four new metal–organic frameworks based on diverse secondary building units: sensing and magnetic properties

    Y. Yan, W. Zhang, F. Zhang, F. Cao, R. Yang, Y. Wang and L. Hou, Dalton Trans., 2018, 47, 1682
    DOI: 10.1039/C7DT04696K

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