Design and synthesis of Eu3+/Tb3+-functionalized coordination polymers as visible fluorescent probes for trace monitoring Zr4+,Fe3+,Cr2O72-,HPO42-and identifying fingerprints
The isomorphic terbium and europium coordination polymers(CPs){[Eu(PLIA)1.5(H2O)2]·H2O}n(1)and{[Tb(PLIA)15(H2O)2]·H2O}n(2),where H2PLIA=5-((pyridin-4-yl-methyl)oxy)benzene-1,3-dicarboxylic acid,were syn-thesized by using aromatic π-conjugated and nitrogen-containing organic linkers.The structure determination,char-acterization,and fluorescence trace identification of the CPs were studied.The two isomorphic complexes have an ideal 3D frame structure and their chemical stability is enhanced by weak interactions such as π…π packing and hydrogen bonds.The characterization shows that CPs 1 and 2 have good fluorescence deletion properties,crystallinity,thermodynamic stability,and structural integrity,and can be used as fluorescence sensing materials.1 and 2 have fluorescence recognition ability for Zr4+,Cr2O72-and Fe3+,HPO42-in aqueous solution,respectively,with good selec-tivity and high sensitivity.The detection limits of these four ions by 1 and 2 were 0.139 µmol·L-1(1,Zr4+),0.626μmol·L-1(1,Cr2O72-),0.430 μmol·L-1(2,Fe3+),1.36 μmol·L-1(2,HPO42-),respectively.The fluorescence quench-ing mechanism of 1 and 2 as probes was investigated in detail.More interestingly,the two complexes have potential fingerprint recognition properties.Their fluorescent fingerprint patterns were clear and coherent,and the details were obvious and could be clearly observed.CCDC:256713,1;2256714,2.
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