A novel europium coordination polymer based on mixed carboxylic acid ligands: Synthesis, structure and luminescence

• A novel europium coordination complex has been successfully isolated.
• It contains mixed carboxylic acid ligands.
• It possesses vertical deficient cubane-like array based on tetranuclear {Eu4} cluster.
• The complex may be employed as a fluorescent ratiometric probe for pollutant Cd(II) anion.

A novel europium complex, formulated as {[Eu4(H3Pimda)4 (Himba)2·4H2O]·4H2O}n (1) (H3Pimda = 2-propyl-1H-imidazole-4,5-dicarboxy acid, and Himba = 4-(1H-imidazole-1-ly) benzoic acid), has been obtained by the hydrothermal reaction. Single crystal X-ray diffraction analysis shows that complex 1 exhibits one-dimensional (1-D) ribbon-double chain composed of tetranuclear europium clusters, and these chains are further linked by Himba ligands into the 2-D corrugated layer arrays. Complex 1 exhibits efficiently sensitized red luminescence in visible region in N,N-dimethyl formamide (DMF) based on characterization emission of europium(III) ion. When Cd(NO3)2 is dropped in the DMF suspension of 1, the luminescence intensity increases linearly, rapidly, which indicates it may be employed as a fluorescent ratiometric probe for detection pollutant Cd(II) anion. In addition, complex 1 is characterized by elemental analysis, IR spectra, thermogravimetric (TG) analysis and PXRD measurement.

A unique europium coordination polymer based on mixed carboxylic acid ligands, {[Eu4(Pimda)4 (Imiba)2·4H2O]·4H2O}n has been synthesized and characterized, 1 may be employed as a fluorescent ratiometric probe for pollutant Cd(II) ion.Figure optionsDownload as PowerPoint slide