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A heterometal-organic framework {[Pr_2Ca(betc)_2(H_2O)_7]·H_2O}_n(1) was prepared by the hydrothermal reaction of 1,2,4,5-benzenetetracarboxylic acid(H4betc) with Pr(NO_3)_3 and CaCO_3, and further characterized by single-crystal X-ray structural ana