Europium(Ⅲ)metal-organic framework as a fluorescent probe for selectively and sensitively sensing Pb2+in aqueous solution
A novel europium metal-organic framework(Eu-MOF)with formula(H3O)6[Eu(BHC)(H2O)]2·H2O(1)has been synthesized successfully via the hydrothermal method by using a monoaromatic polycarboxylic acid ligand ben-zenehexacarboxylic acid(H6BHC)reacting with Eu(NO3)3·6H2O.Single-crystal X-ray diffraction analysis reveals that in 1 the adjacent two Eu(Ⅲ)cations are bridged by the BHC6-ligands to form the Eu dinuclear unit as a node,and then the Eu dinuclear nodes join each other via the BHC6-as bridges plus the hydrogen bond interactions along a-,b-and c-axis to form a unique 3D network structure.Photoluminescence measurement indicates that 1 possesses the following advantages as the fluorescent probe:1 displayed a very low limit of detection(LOD)for Pb2+(0.42μmol·L-1)in an aqueous system,and 1 demonstrated higher selectivity.CCDC:2299340,1.
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