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Issue 29, 2018
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Rational synthesis of a luminescent uncommon (3,4,6)-c connected Zn(ii) MOF: a dual channel sensor for the detection of nitroaromatics and ferric ions

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Abstract

The articulate combination of intriguing functional groups and luminescence properties can deliver metal–organic frameworks (MOFs) with multifarious applications viz. selective and specific sensing of nitroaromatic compounds (NACs), an important constituent of explosives, as well as sensing of toxic metal ions. In this regard, a new d10 configuration based Zn(II) metal–organic framework (MOF) {(NH2(CH3)2)[Zn4(ddn)2(COO)(H2O)4]·solvent}n (1) has been synthesized using a π-conjugated and rigid multicarboxylate ligand 3,5-di(3,5-dicarboxylphenyl)nitrobenzene (H4ddn). 1 displays a 3D (3,4,6)-c connected net which is based on two types of binuclear [Zn22-COO)21-COO)2] and [Zn22-COO)4] clusters. Sensing studies of 1 to detect nitro-aromatic compounds reveal highly specific detection of 2,4-dinitophenol (DNP) with remarkable quenching (KSV = 8.93 × 103 M−1) and a low limit of detection (LOD: 1.12 ppm). The luminescence quenching mechanism in the case of 1 in the presence of NACs has been ascribed to the concurrent presence of the charge transfer as well as the weak interaction between the MOF and NACs. The activated framework of 1 also displayed highly selective detection of ferric ions with KSV = 1.13 × 104 M−1 with a low limit of detection (LOD: 1.24 ppm).

Graphical abstract: Rational synthesis of a luminescent uncommon (3,4,6)-c connected Zn(ii) MOF: a dual channel sensor for the detection of nitroaromatics and ferric ions

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Supplementary files

Article information


Submitted
14 May 2018
Accepted
18 Jun 2018
First published
20 Jun 2018

Dalton Trans., 2018,47, 9627-9633
Article type
Paper

Rational synthesis of a luminescent uncommon (3,4,6)-c connected Zn(II) MOF: a dual channel sensor for the detection of nitroaromatics and ferric ions

A. Ma, J. Wu, Y. Han, F. Chen, B. Li, S. Cai, H. Huang, A. Singh, A. Kumar and J. Liu, Dalton Trans., 2018, 47, 9627
DOI: 10.1039/C8DT01923A

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