Issue 42, 2021

Cation exchange in a fluorescent zinc-based metal–organic framework for cadmium ion detection

Abstract

The anion zinc-based metal–organic framework [HDMA]2n[Zn2n(DMA)2n(1,4-BDC)3n]·2nDMF·6nH2O (1, DMF = N,N-dimethylformamide, 1,4-H2BDC = 1,4-benzenedicarboxylic acid, DMA = dimethylamine) with open channels has been used as a luminescent sensor for Cd2+ detection, and was obtained by solvothermal synthesis and fully characterized. It shows excellent fluorescence stability in aqueous solution, which was further enhanced with a remarkable fluorescence shift upon introduction of Cd2+, while negligible effects occurred for Fe2+, Zn2+, Fe3+, Cu2+, Co2+, Ni2+, Mn2+ and Pb2+, respectively. The detection limit is 9.9 μM with a linear range between 50 and 600 μM for Cd2+. Furthermore, it can be used to detect Cd2+ in tap water and rice samples directly. Solid state 13C NMR spectra give direct evidence for the ion exchange between protonated dimethylamine and Cd2+ hydrates, which results in the increase of fluorescence and blue shift of the wavelength. The coordination of Cd2+ with the carboxyl groups of 1 in the interface of nano-channels can be also observed using IR spectra, where a structural model has been suggested in the confined channels. This may provide a new construction method for anion fluorescent MOF materials, where a confined sample has obvious influence on the detection of Cd2+. The maximum adsorption capacities are 10.36, 54.53, 103.06 and 8.78 mg g−1 for CH4, CO2, O2 and N2 at 30 bar respectively.

Graphical abstract: Cation exchange in a fluorescent zinc-based metal–organic framework for cadmium ion detection

Supplementary files

Article information

Article type
Paper
Submitted
05 ذو الحجة 1442
Accepted
18 صفر 1443
First published
20 صفر 1443

CrystEngComm, 2021,23, 7442-7449

Cation exchange in a fluorescent zinc-based metal–organic framework for cadmium ion detection

M. Chen, Z. Qi, W. Jin, Z. Xu, Y. Cheng and Z. Zhou, CrystEngComm, 2021, 23, 7442 DOI: 10.1039/D1CE00931A

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