In the asymmetric unit of the title compound, [Mn(C2O4)(C3H10N2)2]Cl·H2O, there are two independent MnIII complexes, two Cl− anions and two uncoordinated water molecules. Each MnIII atom is hexacoordinated by four N atoms from two propane-1,3-diamine ligands and two O atoms from one oxalate ligand, resulting in a slightly distorted octahedral MnO2N4 geometry. Mn—O and Mn—N bond lengths are in the ranges 1.969 (2)–2.020 (3) and 2.068 (3)–2.113 (4) Å, respectively. There are weak intermolecular O—H...O, O—H...Cl, N—H...O and N—H...Cl hydrogen bonds with D...A distances in the range 2.831 (4)–3.423 (3) Å

Three 2D new coordination polymers Co2(L1)2(1,10-Phenanthroline)2(DMF)0.5(H2O) (1), (H2L1 = Pyridine-3,5-dicarboxylic acid) Co(L1)(2,2-bipyridine) (2), and Co(L2)(2,2-bipyridine) (DMF) (3) (H2L2 = Pyridine-3,4-dicarboxylic acid) were synthesized through a solvothermal reaction of cobalt nitrate and pyridine carboxylic acid ligand with the auxiliary ligand (1,10-Phenanthroline or 2,2-bipyridine). They were characterized by X-ray diffraction and elemental analysis, infrared spectroscopy, thermogravimetry analysis, and magnetism. Compounds 1–3 featured 2D hexagonal (6,3) networks which linked into 3D supramolecular architectures through π–π interaction. In addition, compounds 1 and 2 showed the antiferromagnetic exchange interactions, and the magnetic property of compound 3 exhibited ferromagnetic exchange interactions.

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In the title compound, [Mn2O(C18H18ClN4)2](PF6)2, the Mn atom is chelated by a tetra­dentate ligand via four N atoms, and further bonded to one chloride ion and one bridging oxide, to give a centrosymmetric cation and distorted octa­hedral coordination geometry.

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