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A coordination polymer formulated as[Mn(5-pncH2)2H2O](1,5-pncH3 =5-phosphono-1-naphthalenecarboxylic acid),was hydrothermally synthesized and magnetically characterized.Compound 1 features a three-dimensional structure in which the inorganic chains of[Mn(O-P-O)]n are cross-linked by the organic groups of phosphonate ligands.Magnetic measurements of 1 indicate that dominant antiferromagnetic interactions are mediated between the MnⅡ centers.