[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

Abstract

The synthesis, structure and some properties of the one-dimensional coordination polymer, [Pr<inf>2</inf>(pdc)<inf>3</inf>(Hpdc)]<inf>n</inf>•n(H3hp)•8n(H<inf>2</inf>O), (H<inf>2</inf>pdc = pyridine 2,6-dicarboxylic acid, C<inf>7</inf>H<inf>5</inf>NO<inf>4</inf>; 3hp = 3-hydroxypyridine, C<inf>5</inf>H<inf>5</inf>NO) are described. One of the Pr3+ ions is coordinated by two O,N,O-tridentate pdc2-ligands and one tridentate Hpdc- anion to generate a fairly regular PrO<inf>6</inf>N<inf>3</inf> tri-capped trigonal prism, with the N atoms acting as the caps. The second Pr3+ ion is coordinated by one tridentate pdc2- dianion, four water molecules and two monodentate bridging pdc2- ligands to result in a PrO<inf>8</inf>N 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 (C<inf>33</inf>H<inf>43</inf>N<inf>5</inf>O<inf>29</inf>Pr<inf>2</inf>), M<inf>r</inf> = 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) Å3, R(F) = 0.033, wR(F2) = 0.084. © 2011 by the authors; licensee MDPI, Basel, Switzerland.