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

A novel europium complex, formulated as ([Eu-4(H(3)Pimda)(4) (Himba)(2)center dot 4H(2)O]center dot 4H(2)O}(n) (1) (H(3)Pimda = 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. (C) 2016 Elsevier B.V. All rights reserved.