Beijing Key Laboratory for Green Catalysis and Separation and Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, 100124, Beijing, P. R. China.
Institute of Quality Standards and Testing Technology for Agro-products, Chinese Academy of Agricultural Sciences, 100081, Beijing, P. R. China.
Nat Commun. 2019 Aug 27;10(1):3861. doi: 10.1038/s41467-019-11912-4.
Polychlorinated dibenzo-p-dioxins (PCDDs), as a class of persistent and highly toxic organic pollutants, have been posing a great threat to human health and the environment. The sensing of these compounds is important but challenging. Here, we report a highly stable zirconium-based metal-organic framework (MOF), ZrO(OH)(HCOO)(CPTTA) (BUT-17) with one-dimensional hexagonal channels and phenyl-rich pore surfaces for the recognition and sensing of two representative PCDDs, 2,3-dichlorodibenzo-p-dioxin (BCDD) and 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), based on the fluorescence quenching. BUT-17 exhibits high sensing ability with the detection limits as low as 27 and 57 part per billion toward BCDD and TCDD, respectively, and is very selective as well without the interference of similar compounds. The recognition of BUT-17 toward BCDD is demonstrated by single-crystal structure of its guest-loaded phase, in which the fluorescence-quenched complexes form between the adsorbed BCDD molecules and the MOF host through π-π stacking and hydrogen bonding interactions.
多氯二苯并对二恶英（PCDDs）作为一类持久性和高毒性的有机污染物，对人类健康和环境构成了巨大威胁。这些化合物的检测非常重要但具有挑战性。在这里，我们报告了一种具有一维六方孔道和富苯基孔表面的高度稳定的锆基金属有机骨架（MOF）ZrO（OH）（HCOO）（CPTTA）（BUT-17），可用于识别和检测两种代表性的 PCDD，即 2,3-二氯二苯并对二恶英（BCDD）和 2,3,7,8-四氯二苯并对二恶英（TCDD），基于荧光猝灭。BUT-17 表现出高的传感能力，对 BCDD 和 TCDD 的检测限分别低至 27 和 57 皮克/每十亿，而且具有很高的选择性，没有类似化合物的干扰。BUT-17 对 BCDD 的识别通过其负载客体的单晶结构得到证明，其中吸附的 BCDD 分子与 MOF 主体之间通过π-π堆积和氢键相互作用形成荧光猝灭复合物。
