Issue 34, 2013

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

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

Supplementary files

Article information

Article type
Paper
Submitted
25 Apr 2013
Accepted
13 Jun 2013
First published
18 Jun 2013

Dalton Trans., 2013,42, 12403-12409

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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