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Issue 34, 2013
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A flexible Eu(iii)-based metal–organic framework: turn-off luminescent sensor for the detection of Fe(iii) and picric acid

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Abstract

A metal–organic framework (MOF) {[Eu2(MFDA)2(HCOO)2(H2O)6]·H2O}n (1) (H2MFDA = 9,9-dimethylfluorene-2,7-dicarboxylic acid) has been solvothermally synthesized and structurally characterized. 1 possesses the three-dimensional pcu type rod-packing structure with one-dimensional rhombic channels. The framework of 1 can reversibly shrink/swell along the c axis upon partial/full release of the water molecules. Correspondingly, the rhombic channels become narrow/large and 1 transforms to narrow-pore 1a/large-pore 1b. 1, 1a and 1b have almost the same excitation and emission spectra with the strong characteristic red-light-emission of Eu(III). A high photoluminescence quantum yield of 77% and long luminescence lifetime of around 1.1 ms was observed for 1. The potential of 1b for Fe3+ ions and PA sensing was studied in DMF through the luminescence quenching experiments, which show 1b is a potential turn-off luminescent sensory material for the selective detection of Fe3+ ions and PA with detection limits of around 10−7 M for both of them. The fluorescence quenching mechanism for Fe3+ ions and PA was also investigated.

Graphical abstract: A flexible Eu(iii)-based metal–organic framework: turn-off luminescent sensor for the detection of Fe(iii) and picric acid

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Supplementary files

Article information


Submitted
25 Apr 2013
Accepted
13 Jun 2013
First published
18 Jun 2013

Dalton Trans., 2013,42, 12403-12409
Article type
Paper

A flexible Eu(III)-based metal–organic framework: turn-off luminescent sensor for the detection of Fe(III) and picric acid

X. Zhou, L. Li, H. Li, A. Li, T. Yang and W. Huang, Dalton Trans., 2013, 42, 12403
DOI: 10.1039/C3DT51081F

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