Issue 33, 2015

Ionic liquid directed syntheses of water-stable Eu– and Tb–organic-frameworks for aqueous-phase detection of nitroaromatic explosives

Abstract

Reactions of lanthanide nitrate, 1,3,5-benzenetrisbenzoic acid (H3BTB) and [RMI]Br ionic liquids (RMI = 1-alkyl-3-methylimidazolium; R = ethyl, propyl, butyl, amyl, or hexyl), gave rise to two novel lanthanide metal–organic frameworks (Ln-MOFs) [Ln(BTB)H2O], where Ln = Eu 1, Tb 2. In addition to helping solubilise the starting materials under the reaction conditions there is evidence that [RMI]Br itself can play a structure directing role and is intimately involved in template ordering in [Ln(BTB)H2O], even though neither the [RMI]+ cation nor the Br anion is occluded into the ultimate structure. 1 and 2 are isostructural and consist of infinite rod-shaped lanthanide-carboxylate building units which are further bridged by trigonal-planar BTB ligands to give noninterpenetrated open 3D frameworks featuring a (6,6)-connected topology with the point symbol (44·67·84)(48·67). Importantly, the strong emission of 1 and 2 dispersed in water prompted us to explore their application for detection of different nitroaromatics in an aquatic system. 1 and 2 show similar selectivity and sensitivity towards the presence of trace amounts of nitroaromatic analytes in the aqueous phase, showing potential as explosive sensors.

Graphical abstract: Ionic liquid directed syntheses of water-stable Eu– and Tb–organic-frameworks for aqueous-phase detection of nitroaromatic explosives

Supplementary files

Article information

Article type
Paper
Submitted
31 May 2015
Accepted
30 Jun 2015
First published
01 Jul 2015

Dalton Trans., 2015,44, 14594-14603

Author version available

Ionic liquid directed syntheses of water-stable Eu– and Tb–organic-frameworks for aqueous-phase detection of nitroaromatic explosives

J. Qin, B. Ma, X. Liu, H. Lu, X. Dong, S. Zang and H. Hou, Dalton Trans., 2015, 44, 14594 DOI: 10.1039/C5DT02054A

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