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Two lanthanide selenite-carboxylate (LSC) compounds, namely, [Ln8(SeO3)4(2,6- pdc)8(H2O)10]·2H2O (Ln = Pr 1, Sm 2; 2,6-pdcH2 = pyridine-2,6-dicarboxylic acid) have been hydro- thermally synthesized and structurally characterized. Both compounds posse