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The reaction of Pr(Ⅲ) salt with 1,2,4,5-benzenetetracarboxylic acid(H_4betc) and piperazine(pip) yielded a lanthanide metal-organic framework {[Pr(betc)(H_2O)_2](H_2pip)0.5}n(1)under hydrothermal conditions. Compound 1 was characterized by single-crystal