Issue 3, 2021

Fabrication of a dual-emitting RhB@Zn-1 composite as a recyclable luminescent sensor for sensitive detection of nitrofuran antibiotics

Abstract

A novel 3D anionic porous metal–organic framework {[(CH3)2NH2][Zn33-OH)(L)2(H2O)]·4H2O·3DMA}n (Zn-1) (H2L = 1-hydroxy-5,5-dioxodibenzothiophen-3,7-dicarboxylic acid, DMA = dimethylacetamide) has been solvothermally synthesized. Single-crystal X-ray analyses reveal that the framework of Zn-1 is based on deformed triangular [Zn3O] clusters with interlinked 1D channels. Taking advantage of the high porosity and charged skeleton of Zn-1, fluorescent dye rhodamine B (RhB) molecules can be successfully incorporated into the channels of Zn-1via an ion-exchange process. Due to the spatial confinement, the RhB@Zn-1 composite shows dual-emission properties including the emissions of Zn-1 centered at 475 nm and RhB centered at 580 nm. Moreover, RhB@Zn-1 can be used as a recyclable fluorescent sensor for sensitive and selective detection of nitrofuran antibiotics (nitrofurantoin and nitrofurazone), with high KSV values (5.61 × 104 M−1 and 4.73 × 104 M−1) and low detection limits (0.73 μM and 0.86 μM). Comparison experiment results show that the sensing capability of Zn-1 can be greatly improved via the dye-encapsulation strategy. Further studies reveal that the synergistic effect of competitive absorption and photo-induced electron transfer causes the fluorescence quenching of Zn-1, which in turn decreases the energy transfer from Zn-1 to RhB and leads to the quenching process of RhB.

Graphical abstract: Fabrication of a dual-emitting RhB@Zn-1 composite as a recyclable luminescent sensor for sensitive detection of nitrofuran antibiotics

Supplementary files

Article information

Article type
Paper
Submitted
10 oct. 2020
Accepted
23 nov. 2020
First published
24 nov. 2020

CrystEngComm, 2021,23, 629-637

Fabrication of a dual-emitting RhB@Zn-1 composite as a recyclable luminescent sensor for sensitive detection of nitrofuran antibiotics

Q. Tu, L. Ren, A. Cheng and E. Gao, CrystEngComm, 2021, 23, 629 DOI: 10.1039/D0CE01483D

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