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A novel complex {[Eu(H5TIA)(C2O4)0.5(H2O)3]·H2O}n of Eu(Ⅲ)with aromatic carboxylic triazole (H7TIA =5-(4H-1,2,4-triazo1-4-y1)isophthalic acid,H2C2O4=oxalic acid)was hydrothermally synthesized and characterized by IR,UV-Vis,emission spectra and optica