Abstract

A luminescent Eu-complex is synthesized with the use of Eu(NO3)3·6H2O, zinc acetate dihydrate, biphenyl-4,4-dicarboxylic acid (BPDC) and adenine. Ag+ is further fabricated with the complex by stirring the Eu-complex in silver nitrate solution at dark for 6h. Both of the two complexes show the similar framework structure to Bio-MOF-1. Subsequently, the resulting complex (labeled as Ag+@Eu-complex) is developed as a fluorescence probe for aspartic acid. The existence of aspartic acid can make the emission intensity of ligand enhance a lot while Eu3+ decrease gradually, which is different from other 19 kinds of common amino acids. We also examine the luminescent properties of Ag+@Eu-complex in varying concentration of aspartic acid, which show the favorable linear relationship between luminescent intensity and concentration of aspartic acid as well low detection limit (calculated as 0.46μM). The results indicate that the material can be a good sensor for aspartic acid.

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