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An unique europium coordination polymer,formulated as {[Eu4(Pimda)4 (Imiba)2·4H2O]·4H2O}n (1) (Pimda = 2-propyl-1H-imidazole-4,5–dicarboxy acid,Imiba = 4-(1H-imidazole-1-ly) benzoic acid) has been obtained by hydrothermal reactions.