用于选择性检测Fe（iii）阳离子和Cr（vi）阴离子†的多功能发光金属有机框架

IF 2.6 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

CrystEngComm Pub Date : 2025-01-03 DOI:10.1039/D4CE01107D

Han Fang, Jia-Peng Han, Bo Zhang, Deng-Bo Liu, Xing-Wang Li, Jing-Yu Li, Yutong He and Mei-Hui Yu

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引用次数: 0

摘要

重金属离子污染已成为最严重的环境问题之一，这促使人们不断探索新的材料和方法来实现对重金属离子的高效检测。发光金属有机框架（LMOFs）具有可设计的功能结构和可调谐的发光特性，在识别和检测重金属离子方面具有良好的潜力。本文制备了一种基于Cd（II）的发光MOF {[Cd2(2F-bpdc)2(tib)]}n (NKM-103) (tib = 1,3,5-三（1-咪唑基）苯；成功地设计合成了2F-H2bpdc = 3,3 ' -二氟联苯-4,4 ' -二羧酸)。由于具有共轭单元的tib配体的发光特性，NKM-103具有优异的荧光发射性能和潜力，可以通过关闭效应检测Fe（III）阳离子和Cr（VI）阴离子（Cr2O72−和CrO42−）。此外，NKM-103对这三种离子的检出限低，选择性高。

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A versatile luminescent metal–organic framework for selective detection of Fe(iii) cations and Cr(vi) anions†

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A versatile luminescent metal–organic framework for selective detection of Fe(iii) cations and Cr(vi) anions†

Heavy metal ion pollution has become one of the most serious environmental problems, which promotes the continuous exploration of new materials and methods to achieve efficient detection of heavy metal ions. Luminescent metal–organic frameworks (LMOFs) featuring designable, functional structures and tunable luminescence properties exhibit excellent potential for the recognition and detection of heavy metal ions. Herein, a Cd(II)-based luminescence MOF {[Cd₂(2F-bpdc)₂(tib)]}_n (NKM-103) (tib = 1,3,5-tris(1-imidazolyl)benzene; 2F-H₂bpdc = 3,3′-difluorobiphenyl-4,4′-dicarboxylic acid) was successfully designed and synthesized. Owing to the luminescence characteristic of the tib ligand with conjugated units, NKM-103 demonstrates excellent fluorescence emission performance and potential as a sensor for detecting both Fe(III) cations and Cr(VI) anions (Cr₂O₇²⁻ and CrO₄²⁻) through a turn-off effect. Moreover, NKM-103 shows low detection limit and high selectivity for all three types of ions.