Jump to main content
Jump to site search

Issue 3, 2020
Previous Article Next Article

Luminescent metal–organic framework-based phosphor for the detection of toxic oxoanions in an aqueous medium

Author affiliations

Abstract

A terbium-doped yttrium-based metal–organic framework, [Tb0.2Y0.8(FDA)(Ox)0.5(H2O)2]·H2O, 1 {where H2FDA = furan-2,5-dicarboxylic acid and Ox = oxalate}, was successfully synthesized using the hydrothermal technique as a phosphor material along with a large Stokes shift and low self-quenching of luminescence for the rapid visible detection of toxic anions in an aqueous medium. To confirm the structure and phase purity of compound 1, single crystals of the isomorphous pure yttrium-based compound [Y(FDA)(Ox)0.5(H2O)2]·H2O, 1a, were synthesized under similar experimental conditions. The single crystal X-ray data of compound 1a confirmed the three-dimensional metal–organic framework formed by the connectivity of the Y3+ ion with furan-2,5-dicarboxylate and the oxalate moiety. The phase purity of compounds 1 and 1a was confirmed by powder X-ray diffraction. Compound 1 was systematically characterized via TGA, SEM and EDX elemental mapping analysis. The aqueous dispersion of compound 1 showed highly intense visible green emission upon excitation at 265 nm. The emissions of compound 1 were utilized for the luminescence-based visible detection of toxic anions in the aqueous medium through luminescence quenching. The observed limit of detection (LOD) was 1.1 nM, 2.2 nM and 6.5 nM for chromate (CrO42−), permanganate (MnO4) and phosphates (PO43−, H2PO4 and HPO42−), respectively, and the observed KSV values were superior to those of all other metal–organic frameworks previously reported. More importantly, the LODs are significantly lower than the level recommended for these anions towards human life.

Graphical abstract: Luminescent metal–organic framework-based phosphor for the detection of toxic oxoanions in an aqueous medium

Back to tab navigation

Supplementary files

Article information


Submitted
31 Oct 2019
Accepted
05 Dec 2019
First published
05 Dec 2019

Dalton Trans., 2020,49, 829-840
Article type
Paper

Luminescent metal–organic framework-based phosphor for the detection of toxic oxoanions in an aqueous medium

D. K. Singha, P. Majee, S. Hui, S. K. Mondal and P. Mahata, Dalton Trans., 2020, 49, 829
DOI: 10.1039/C9DT04220B

Social activity

Search articles by author

Spotlight

Advertisements