In the title complex, [Zn(C8H3NO6)(H2O)3]n, the two carboxylate groups of the 4-nitrophthalate dianion ligands have monodentate and 1,3-bridging modes, and Zn atoms are interconnected by three O atoms from the two carboxylate groups into a zigzag one-dimensional chain along the b-axis direction. The Zn atom shows distorted octahedral coordination as it is bonded to three O atoms from carboxylate groups of three 4-nitrophthalate ligands and to three O atoms of three non-equivalent coordinated water molecules. The one-dimensional chains are aggregated into two-dimensional layers through inter-chain hydrogen bonding. The whole three-dimensional structure is further maintained and stabilized by inter-layer hydrogen bonds.
In the title complex, {[Ba(C(5)H(6)O(4))(H(2)O)] x C(5)H(8)O(4)}(n), the neutral dimethylmalonic acid molecules and the dianionic (dimethylmalonato)barium metal-organic framework are linked by cocrystallization. The Ba atom, in a distorted monocapped square-antiprismatic geometry, is nine-coordinated by seven O atoms of four different dimethylmalonate groups and by two water molecules. This arrangement generates a two-dimensional layer parallel to the bc plane. Two such layers sandwich another layer composed of neutral dimethylmalonic acid molecules that are involved in intermolecular hydrogen bonds within this layer and to neighboring layers. This complex is different from the dimethylmalonate-Ba complex reported previously. The title compound displays a novel structure type and represents a new member of the substituted malonate series of alkaline earth complexes.
In the title complex, {[Cd(2)(C(8)H(3)NO(6))(2)(C(4)H(10)N(2))(H(2)O)(4)] x 2 H(2)O}(n), the Cd(II) atoms show distorted octahedral coordination. The two carboxylate groups of the dianionic 2-nitroterephthalate ligand adopt monodentate and 1,2-bridging modes. The piperazine molecule is in a chair conformation and lies on a crystallographic inversion centre. The Cd(II) atoms are connected via three O atoms from two carboxylate groups and two N atoms from piperazine molecules to form a two-dimensional macro-ring layer structure. These layers are further aggregated to form a three-dimensional structure via rich intra- and interlayer hydrogen-bonding networks. This study illustrates that, by using the labile Cd(II) salt and a combination of 2-nitroterephthalate and piperazine as ligands, it is possible to generate interesting metal-organic frameworks with rich intra- and interlayer O-H...O hydrogen-bonding networks.
The asymmetric unit of the title compound, (C11H18N)4[Mo8O26], contains two cations and one half‐anion; the anion is centrosymmetric. The anion is a β‐isomer. Although no classical hydrogen bonds are found, a large number of weak intermolecular C—H...O hydrogen bonds and van der Waals forces stabilize the packing of the ions.
The asymmetric unit of the title compound, (C13H22N)4[Mo8O26], comprises four independent benzyltriethylammonium cations and two independent Mo4O13 units. These latter units lie about inversion centres which generate two complete Mo8O264− anions in the β‐isomeric form. Four discrete sets of Mo—O bond distances are found in the octamolybdate anions corresponding to terminal and μ2‐, μ3‐ or μ5‐bridging situations. In the crystal structure, an extensive array of weak intermolecular C—H...O hydrogen bonds stabilizes the crystal packing.
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