[Pr-2(pdc)(3)(Hpdc)(H2O)(4)](n)center dot n(H3hp)center dot 8n(H2O), a One-Dimensional Coordination Polymer Containing PrO6N3 Tri-Capped Trigonal Prisms and PrO8N Mono-Capped Square Anti-Prisms (H(2)pdc = Pyridine 2,6-Dicarboxylic Acid, C7H5NO4; 3hp=3-Hydroxy Pyridine, C5H5NO)

Abstract

The synthesis, structure and some properties of the one-dimensional coordination polymer, [Pr-2(pdc)(3)(Hpdc)](n)center dot n(H3hp)center dot 8n(H2O), (H(2)pdc = 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-H center dot center dot center dot O and numerous O-H center dot center dot center dot O 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, P (1) over bar1 (No. 2), Z = 2, alpha = 13.2567(1) angstrom, b = 13.6304(2) angstrom, c = 13.6409(2) angstrom, alpha = 89.695(1)degrees, beta= 63.049(1)degrees, gamma = 86.105(1)degrees, V degrees= 2191.16(5) angstrom(3), R(F) = 0.033, wR(F-2) = 0.084.