A channel-structured Eu-based metal–organic framework with a zwitterionic ligand for selectively sensing Fe3+ ions

Yong-Qing Huang; Huai-Ying Chen; Yang Wang; Yong-He Ren; Zong-Ge Li; Lu-Chao Li; Yan Wang

doi:10.1039/C8RA02809E

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A channel-structured Eu-based metal–organic framework with a zwitterionic ligand for selectively sensing Fe³⁺ ions†

Yong-Qing Huang,

*^a Huai-Ying Chen,^a Yang Wang,^a Yong-He Ren,^a Zong-Ge Li,^a Lu-Chao Li^a and Yan Wang^b

Author affiliations

* Corresponding authors

^a State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China
E-mail: yqhuangskd@163.com

^b School of Chemistry and Chemical Engineering, Anhui Key Laboratory of Functional Coordination Compounds, Anqing Normal University, Anqing 246011, China

Abstract

A novel Eu-based MOF [Eu(IMS1)₂]Cl·4H₂O (1) was successfully constructed based on a semi-rigid zwitterionic 1,3-bis(4-carboxylbenzyl)-imidazolium (IMS1) ligand, featuring a 3-fold interpenetrating dia net structure with a point symbol of 6⁶ and charged permanent micropores. Considering its excellent luminescent property as well as thermal and chemical stability, complex 1 was explored as a potential sensor for detecting Fe³⁺ ions. The results show that complex 1 has a high sensitivity and selectivity for Fe³⁺ based on a ‘turn-off’ effect, for which the electrostatic interaction between Fe³⁺ ions and the inner surface of the micropores may play a critical role. The fluorescence quenching mechanism reveals that dynamic quenching and competitive adsorption between Fe³⁺ and 1 lead to the quenching effect of 1.

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Article information

DOI: https://doi.org/10.1039/C8RA02809E
Article type: Paper
Submitted: 01 Apr 2018
Accepted: 08 Jun 2018
First published: 12 Jun 2018
This article is Open Access

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RSC Adv., 2018,8, 21444-21450

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A channel-structured Eu-based metal–organic framework with a zwitterionic ligand for selectively sensing Fe³⁺ ions

Y. Huang, H. Chen, Y. Wang, Y. Ren, Z. Li, L. Li and Y. Wang, RSC Adv., 2018, 8, 21444 DOI: 10.1039/C8RA02809E

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