Yuan-Gen Yao

The title compound, [Zn(SO(4))(C(12)H(10)N(2))](n), features a layered structure based on [Zn(SO(4))](n) spirals linked by 1,2-di-4-pyridylethylene (bpe) ligands, with the tetrahedral Zn and S atoms lying on twofold axes. The bpe ligands are centrosymmetric. The layers are linked by weak C-H...O interactions.

Two hydrothermally synthesised 3D metal‐coordination polymers, namely [Cu(isonicotinate)(nicotinate)]_n (1), with an 8‐connected CsCl topology, and [Cu₂(μ₃‐OH)(isonicotinate)₂(BDC)_0.5]_n (2), with an unusual 8‐connected 3⁵.4¹¹.5⁸.6⁴ topology, demonstrate that highly connected SBUs can be employed in the construction of complicated frameworks. The temperature‐dependent magnetic susceptibilities for the two complexes were also determined. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)

The title compound, [CoII(C10H8O6)(C10H8N2)(H2O)2]n, was obtained by the hydrothermal reaction of CoSO(4) with benzene-1,4-dioxydiacetate [systematic name: p-phenylenebis(oxyacetate)] and 4,4'-bipyridine (4,4'-bpy). The Co atom lies at an inversion center and the benzene-1,4-dioxydiacetate and 4,4'-bipyridine moieties lie about other inversion centers. The benzene-1,4-dioxydiacetate ligands bridge the octahedral Co(II) coordination centers, forming a one-dimensional zigzag chain. The chains are further bridged by 4,4'-bpy ligands, forming a novel two-dimensional supramolecular architecture. Hydrogen-bonding interactions between the coordinated water molecules and the carboxylate O atoms lead to the formation of a three-dimensional network structure.

In the title compound, [Cu(C(8)H(4)O(5))(C(5)H(5)N)(2)](n) or [Cu(OH-BDC)(py)(2)](n) (where OH-H(2)BDC is 5-hydroxyisophthalic acid and py is pyridine), the Cu atoms are coordinated by two N atoms from the pyridine ligands and by three O atoms from hydroxyisophthalate ligands in a highly distorted triangular bipyramidal environment, with Cu-O distances in the range 1.941 (4)-2.225 (5) A and Cu-N distances of 2.014 (6) and 2.046 (6) A. The [Cu(OH-BDC)](n) two-dimensional network is built up from interlocking 22-, 15- and eight-membered rings via sharing of Cu atoms and O-H...O hydrogen bonds. Consolidation of the packing structure is achieved by edge- or point-to-face C-H...pi interactions and offset or slipped pi-pi stacking interactions.

The title compound, [Nd(C(7)H(3)O(6)S)(H(2)O)](n) or [Nd(SSA)(H(2)O)](n) (H(3)SSA is 5-sulfosalicylic acid), was synthesized by the hydrothermal reaction of Nd(2)O(3) with H(3)SSA in water. The compound forms a three-dimensional network in which the asymmetric unit contains one Nd(III) atom, one SSA ligand and one coordinated water molecule. The central Nd(III) ion is eight-coordinate, bonded to seven O atoms from five different SSA ligands [Nd-O = 2.405 (4)-2.612 (4) angstroms] and one aqua O atom [Nd-OW = 2.441 (4) angstroms].

The title compound, {[Cu(C₈H₆NO₄)₂]·H₂O} _n , was prepared by the hydrothermal assembly of 5-aminoisophthalic acid with copper nitrate. Single-crystal X-ray analysis shows that it has a two-dimensional layer coordination framework, in which the unique Cu atom lies on an inversion centre and adopts a square-planar geometry, coordinated to two N and two O atoms from symmetry-related ligands. The water molecule lies on a twofold axis and there are hydrogen-bonding interactions between the layers.