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A new 3d-4f heterometallic polymer {[Sm2Cu(PDC)2(SO4)2(H2O)6]·2H2O}n 1 has been synthesized by Sm2O3, Cu(SO4)2·5H2O and pyridine-3,5-dicarboxylic acid under hydrothermal conditions. The compound crystallizes in triclinic system, space group P1,