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Syntheses, Structures and Photoluminescence of Novel lanthanide-organic frameworks Based on 1, 4-Bis(3,5-dicarboxylic pyrazol-1-ylmethyl) Benzene

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Chinese Journal of Structural Chemistry 2020年第5期39卷 960-966页

作者：李闯何永科邵娜熊刚吴双妍由立新孙亚光 The Key Laboratory of Inorganic Molecule-based Chemistry of Liaoning Province College of Applied ChemistryShenyang University of Chemical TechnologyShenyang 110142China

Two isomorphic 3D lanthanide metal-organic frameworks,{[Tb(L)0.5(OX)0.5(H2 O)2DMF]·DMF}n(1)and{[Dy(L)0.5(OX)0.5(H2 O)2 DMF]·DMF}n(2),have been prepared under solvothermal conditions based on l,4-bis(3,5-dicarboxylicpyrazol-1-ylmethyl)benzene(H4 L),oxalis acid(H2 OX)and lanthanide ions.Compound 1 crystallizes in monoclinic system,space group P21/c with a=9.418(15),b=15.23(2),c=14.47(2)?,β=100.07(3)°,V=2044(5)?3,Z=4,Mr=590.3 g/mol,Dc=1.919 g/cm^3,μ=3.524 mm-1,F(000)=1168,R=0.0893 and wR=0.1902 for 3486 observed reflections(I>2σ(I)).In compound 1,the central terbium(Ⅲ)ions are coordinated with eight atoms,and two neighboring terbium(Ⅲ)ions are linked together by one bridging oxalic acid group to give rise to a[Tb2(OX)(L)4]unit.Each[Tb2(OX)(L)4]unit connects to the surrounding six identical ones by the oxygen atoms bridging to lead to a 3D framework.Compound 1 exhibits strong luminescent emissions at the solid state owing to the antenna effect of the ligand.

关键词： lanthanide-organic frameworks luminescent emission antenna effect

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Decoding and quantitative detection of antibiotics by a luminescent mixed-lanthanide-organic framework

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Frontiers of Environmental Science & Engineering 2022年第12期16卷 55-65页

作者： Yuping Wang Jing Xia Yanxin Gao Department of Environmental Science and Engineering Fuzhou UniversityMinhou350108China State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process School of Resources and Environmental EngineeringEast China University of Science and TechnologyShanghai200237China

Due to the potential risk of antibiotics to the environment,the development of inexpensive,simple,and reliable antibiotic detection methods is significant but also faces challenges.In this work,several lanthanide-organic frameworks(LOFs),constructed from lanthanide ions(Eu3+and/or Tb3+)and 1,3,5-benzene-tricarboxylic acid(BTC),were synthesized by solvothermal method.LOF-S3 with comparable emission peaks of 5D4→7F5(Tb3+,545 nm)and 5D0→7F2(Eu3+,618 nm)was selected as a luminescent sensor.In this system,the highly efficient energy transferred from the organic linker to lanthanide ions and from Tb3+to Eu3+occurs.LOF-S3 sensor was capable of decoding antibiotics by distinguishable emission intensity ratios.Therefore,a two-dimensional decoded map of antibiotics was established.The linear relationship between antibiotic concentration and emission intensity ratio indicated the quantitative determination of antibiotics was feasible.As a typical analyte,the response mechanism of nalidixic acid(NA)was investigated in detail.The competition of NA and BTC for UV light absorption,as well as the binding propensity of NA and Tb,affected the organic linkers-to-lanthanide ions and Tb-to-Eu energy transfer,resulting in the change of fluorescence intensity ratio.The self-calibrating mixed-LOF sensor overcame the uncontrollable errors of the traditional absolute emission intensity method and generated stable luminescent signals in multiple cycles.Furthermore,the integration of LOF-S3 with polymer fibers enabled the formation of a LOF-polymer fibrous composite with fluorescence detection capability,which is a promising portable sensor for practical applications.

关键词： Antibiotics Sensor Luminescence lanthanide-organic frameworks

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