Abstract.Four Ln-NDC coordination polymers [Ln(NDC)(HNDC)(H 2 O)] (Ln = La (1), Pr (2), Nd (3), Sm (4), H 2 NDC = 1,4-naphthalenedicarboxylic acid) were hydrothermally synthesized and structurally characterized by elemental analyses, IR spectroscopy, and single-crystal X-ray diffraction. Compounds 1-4 are isomorphous, and their structures display a layer constructed from a Ln-organic chain and NDC 2-ligand, in which the H 2 NDC ligands adopt two different
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