[Pr2(pdc)3(Hpdc)(H2O)4]n·n(H3hp)·8n(H2O), a One-dimensional coordination polymer containing PrO6N3 tri-capped trigonal prisms and PrO8N mono-capped square anti-prisms (H2pdc = Pyridine 2,6-dicarboxylic Acid, C7H5NO4; 3hp = 3-hydroxy pyridine

The synthesis, structure and some properties of the one-dimensional coordination polymer, [Pr₂(pdc)₃(Hpdc)]_n•n(H3hp)•8n(H₂O), (H₂pdc = pyridine 2,6-dicarboxylic acid, C₇H₅NO₄; 3hp = 3-hydroxypyridine, C₅H₅NO) are described. One of the Pr³⁺ ions is coordinated by two O,N,O-tridentate pdc^2-ligands and one tridentate Hpdc^- anion to generate a fairly regular PrO₆N₃ tri-capped trigonal prism, with the N atoms acting as the caps. The second Pr³⁺ ion is coordinated by one tridentate pdc^2- dianion, four water molecules and two monodentate bridging pdc^2- ligands to result in a PrO₈N coordination polyhedron that approximates to a mono-capped square-anti-prism. The ligands bridge the metal-atom nodes into a chain, which extends in the [100] direction. The H3hp⁺ cation and uncoordinated water molecules occupy the inter-chain regions and an N-HLO and numerous O-HLO hydrogen bonds consolidate the structure. The H3hp⁺species appears to intercalate between pendant pdc rings to consolidate the polymeric structure. Crystal data:1 (C₃₃H₄₃N₅O₂₉Pr₂), M_r = 1255.54, triclinic, P1(No. 2), Z = 2, a = 13.2567(1) Å, b = 13.6304(2) Å, c = 13.6409(2) Å,α = 89.695(1)°, β = 63.049(1)°, γ = 86.105(1)°, V = 2191.16(5) ų, R(F) = 0.033, wR(F²) = 0.084.