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Issue 12, 2018
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Seven luminescent metal–organic frameworks constructed from 5-(triazol-1-yl)nicotinic acid: luminescent sensors for CrVI and MnO4 ions in an aqueous medium

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Abstract

Seven new luminescent metal–organic frameworks (LMOFs), [Cd1.5(L)2(H2O)(NO3)]n (1), [Cd(L)2(H2O)2]n (2), [Pb(L)(H2O)2(NO3)]n (3), [Pb(L)2(H2O)]n (4), [Zn(L)2(H2O)4]n (5), [Zn2(L)(btc)(H2O)2]n (6) and {[Zn(L)(p-bdc)0.5(H2O)](p-H2bdc)0.5}n (7), were assembled employing 5-(triazol-1-yl)nicotinic acid (HL) with Cd(II), Pb(II) and Zn(II) ions, revealing versatile frameworks as well as various types of coordination modes of HL. Single-crystal X-ray diffraction analyses reveal the different dimensionalities (0D, 1D, 2D or 3D) of complexes 1–7. Complex 1 displays a 3D dense-packing structure with a 3-nodal 3,4,6-connected net with a symbol of {4·64·8}2{4·2·64·89}{62·8}2. Complex 2 presents a 2D layered structure with a uninodal 4-connected sql net with a symbol of (44·62). Complex 3 shows a 1D chain based on [Pb2(COO)2(H2O)4(NO3)2N2] secondary building units (SBUs) and 4 exhibits a 1D dimeric chain. Complex 5 is a 0D structure. Complexes 6 and 7 display 2D layered structures based on binuclear [Zn2(COO)4(H2O)2N2] SBUs, which are designated as a 4-nodal 3,3,3,6-connected net with a symbol of {4·62}2{42·610·83}{63}4 and a 4-connected sql net, respectively. Further, the solid-state luminescence properties of the complexes were measured at room temperature. Meanwhile, 2 shows high selectivity and sensitivity for CrO42−, Cr2O72− and MnO4 ions by luminescence quenching effect with low detection limits, and the mechanisms of the quenching effect are discussed in detail.

Graphical abstract: Seven luminescent metal–organic frameworks constructed from 5-(triazol-1-yl)nicotinic acid: luminescent sensors for CrVI and MnO4− ions in an aqueous medium

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Publication details

The article was received on 09 Mar 2018, accepted on 23 Apr 2018 and first published on 24 Apr 2018


Article type: Paper
DOI: 10.1039/C8NJ01144C
Citation: New J. Chem., 2018,42, 9865-9875
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    Seven luminescent metal–organic frameworks constructed from 5-(triazol-1-yl)nicotinic acid: luminescent sensors for CrVI and MnO4 ions in an aqueous medium

    Y. Yan, F. Cao, W. Zhang, S. Zhang, F. Zhang and Y. Wang, New J. Chem., 2018, 42, 9865
    DOI: 10.1039/C8NJ01144C

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