A fluorescent Eu(Ⅲ) MOF for highly selective and sensitive sensing of picric acid

• 来源期刊: 中国科学:化学（英文版）
• 年，卷（期）: 2019,（2）
• 页码范围: 205-211
• 页数: 7页
• 语种: 英文

摘要

A metal-organic framework [Eu3L3(CH3COO)2(H2O)2(μ3-OH)]·3DMF,(EuL,H2L=9H-carbazole-2,7-dicarboxylic acid,DMF=N,N-dimethylformamide) has been synthesized under solvothermal conditions and structurally characterized.In EuL,Eu6O8 clusters are four-bridged by carboxylates to form parallel-aligned Eu-O-C chains,which are further linked by the carbazole moieties of L2-ligands to form the three-dimensional framework with rhombic channels.The EuL material with characteristic emission of Eu3+ ion exhibits significant luminescence quenching response for picric acid (PA) and the linear Stern-Volmer plot was observed in the concentration range of0.05-0.15 mM with Ksv of 98074 M-1.As far as we know,this Ksv is among the highest values for COFs and MOFs in detection of PA.The excellent anti-interference ability and repeatability were also verified by experiments.Lastly,we investigated the luminescence quenching mechanism in the EuL sensing system.