Multi-responsive luminescent sensor based on Zn (II) metal-organic framework for selective sensing of Cr(III), Cr(VI) ions and p-nitrotolune
Abstract
A three-dimensional (3D) zinc metal-organic framework (MOF), {[Zn2(μ3-OH)(cpta)(4,4‧-bipy)]·H2O}n (1) (4,4‧-bipy = 4,4‧-bipyridine) was solvothermally synthesized base on a semirigid V-shaped multicarboxylate ligand 2-4(-carboxyphenoxy)terephthalic acid (H3cpta). 1 has a complicated 3D structure in which the tetramer [Zn4(μ3-O)2O10N4] second building units (SBUs) are interconnected by the V-shaped cpta3- and 4,4‧-bipy ligands. 1 shows good selective and sensitive fluorescence sensing effect for detecting Cr(III)/Cr(VI) ions and p-nitrotolune (p-NP). The detection limits of Cr3+, Cr2O72-, and p-NP can reach 5.55 × 10-6, 6.91 × 10-6 and 4.01 × 10-6 M, respectively. Moreover, 1 can be recycled at least four times for sensing Cr3+ and Cr2O72- ions. In addition, the luminescence intensity of 1 is strongly correlated with the pH value in a pH range from 2 to 12.
- Publication:
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Journal of Solid State Chemistry France
- Pub Date:
- December 2018
- DOI:
- 10.1016/j.jssc.2018.08.035
- Bibcode:
- 2018JSSCh.268..168J
- Keywords:
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- Zn-MOF;
- Semirigid V-shaped multicarboxylate ligand;
- Fluorescent sensing;
- Chromium;
- p-nitrotolune