A zinc-based metal-organic framework for fluorescence detection of trace Cu2+
A novel extremely effective fluorescent zinc organic framework probe[Zn6(L)3(2,2'-bpy)4]2H2O}n(Zn-MOF)for Cu2+was prepared by a hydro-solvothermal method,where H4L=1,4-bis(3,5-dicarboxyphenoxy)benzene and 2,2'-bpy=2,2'-bipyridine.Its synthesis,structure,thermal stability,and fluorescence sensing proper-ties are described in this paper.Zn-MOF is capable of identifying Cu2+and shows good stability according to the flu-orescence quenching method.The fluorescence intensity of the Zn-MOF has demonstrated an essential linear con-nection with the Cu2+concentration in a concentration range of 0-1.2 μmol·L-1,with a low limit of detection(LOD)of 67.1 nmol·L-1.More crucially,the obtained results indicating that Zn-MOF selectively recognizes Cu2+through weak interactions are corroborated by a systematic analysis of X-ray photoelectron spectroscopy,inductively cou-pled plasma-mass spectrometry,powder X-ray diffraction,and infrared spectra.Furthermore,this Zn-MOF demon-strates strong regeneration capability in five consecutive cycles.CCDC:2349882.
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