Xiangdong Zhang

Poly[[diaqua-μ4-tartrato-μ2-tartrato-dimanganese(II)] dihydrate]

In the title compound, {[Mn(C4H4O6)(H2O)]·H2O}n, the Mn2+ ion is connected to three different tartrate anions and a water molecule, resulting in a distorted MnO6 octahedral geometry. There are two tartrate half-anions in the asymmetric unit, both of which are completed by crystallographic twofold rotation symmetry. The tartrate dianions bridge the Mn2+ ions to form a wave-like infinite layer. A series of O—H⋯O hydrogen bonds link the layers into a three-dimensional network.

Synthesis and Crystal Structure of 1D Coordination Polymer of N,N′‐Bis(3‐pyridylmethyl)‐1,4‐benzenedicarboxamide and Cobalt(II) Nitrate

A noval cobalt(H) coordination polymer, {[Co(bpmb)(H2O)2(C2HsOH)2]·(NO3)2}- (1), where bpmb=N,N-bis(3-pyridylmethyl)-1,4-benzenedicarboxamide, was synthesized by self-assembly of the two topic ligands with cobalt nitrate in ethanol solution, and characterized structurally by X-ray crystallography analysis. The crystal data belong to triclinic, space group P1 with cell parameters a=0.8911(3) nm, b=0.9042(3) nm, c=1.0068(3) nm, α=73.083(5)°, β=81.069(5)°, γ=76.210(5)°, R1=0.0518, wR2=0.0947. The results of structure analysis indicate that each bpmb ligand coordinates two Co(Ⅱ) atoms and each metal atom is in octahedral coordination geometry with four oxygen atoms of two ethanol and two water molecules, two nitrogen atoms from two different bpmb ligands in trans position forming an infinite 1D chain-like structure. There are hydrogen bonding and π-π stacking interaction among these chains, leading to supramolecular formation with 3D net structure.

Aqua-(4,5-dihydroxy-benzene-1,3-disulfonato-κO)bis-(1,10-phenanthroline-κN,N')cadmium(II) monohydrate.

In the title compound, [Cd(C6H4O8S2)(C12H8N2)2(H2O)]·H2O, each CdII ion is coordinated by four N atoms [Cd—N = 2.310u2005(7)–2.341u2005(7)u2005Å] from two 1,10-phenanthroline ligands, one O atom [Cd—O = 2.300u2005(6)u2005Å] from a 4,5-dihydroxybenzene-1,3-disulfonate ligand and one aqua O atom [Cd—O = 2.288u2005(7)u2005Å] in a distorted octahedral geometry. The crystal packing exhibits intermolecular O—H⋯O and C—H⋯O hydrogen bonds and π–π interactions evidenced by relatively short distances [3.525u2005(5)–3.937u2005(6)u2005Å] between the centroids of the six-membered rings of neighbouring molecules.

Formation of a one-dimensional water chain containing two linking patterns of planar water tetramers.

The self-assembly of the title dinuclear complex, namely (mu-p-phenylenediamine-N,N,N,N-tetraacetato)bis[aqua(1,10-phenanthroline)nickel(II)] dodecahydrate, [Ni(2)(C(14)H(12)N(2)O(8))(C(12)H(8)N(2))(2)(H(2)O)(2)].12H(2)O, through intricate noncovalent interactions results in a two-dimensional sheet-like structure. The dimer lies about an inversion centre at the centre of the p-phenylenediamine ring. Uncoordinated water molecules form one-dimensional chains in which cyclic water tetramers act as two types of building blocks. The water molecules play a significant role in the stabilization of the three-dimensional supramolecular framework. Intramolecular ;aryl-metal chelate ring pi-pi interactions are also observed.

Ethyl [(n-butyl­ammonio)(2-hydroxy­phen­yl)meth­yl]phospho­nate

The title compound, C13H22NO4P, crystallizes as a zwitterion. The crystal packing exhibits N—H⋯O and O—H⋯O hydrogen bonds, leading to the formation of a three-dimensional supraxadmolecular network. Three C atoms, one in the nBu group and two in the Et group, are disordered over two positions; the site occupancy factors are ca. 0.8/0.2, 0.7/0.3 and 0.6/0.4.

Ternary Complexes of Cadmium(II) with Phenylalanine and Phenylalkylmalonates in Dioxane–Water Mixtures

The formation and stability of ternary complexes of cadmium(II) with phenylalanine and malonate, phenylmalonate benzylmalonate, 2-phenylethylmalonate, and 3-phenylpropylmalonate, have been studied by the potentiometric pH titration technique in 40% (v/v) dioxane–water at 25°C and 0.10—ionic strength (NaNO3). All systems give stable ternary complexes, and the Δ log K and δK values demonstrated that the complexes possess enhanced stability. The possible reasons that lead to these results are discussed in terms of π–electron back donation from metal ions to ligands and intramolecular ligand–ligand aromatic ring-stacking interactions present in the complexes. The relative contribution of each interactions to the enhanced stability have also been evaluated.

1,10-Phenanthrolinium 2,3,4,5,6-penta­fluoro­benzoate–2,3,4,5,6-penta­fluoro­benzoic acid (1/2)

In the title compound, C12H9N2 +·C7F5O2 −·2C7HF5O2, the cation and anion are linked by an N—H⋯O hydrogen bond. The neutral molecules bond to the anion via O—H⋯O hydrogen bonds to form associations of one cation, one anion and two neutral molecules. Intermolecular C—H⋯O, C—H⋯F, F⋯F [shortest contact = 2.768u2005(8)u2005Å], F⋯π [shortest contact = 3.148u2005(13)u2005Å] and π–π [shortest centroid–centroid separation = 3.689u2005(5)u2005Å] interactions further link the components to form a three-dimensional network.

A Facile Copper-Catalyzed In Situ Reaction Generating a Novel Organic Ligand from Citrazinic Acid

Reaction of citrazinic acid with copper nitrate and 2,2′-bipy complex in alkaline aqueous solution gives a complex containing complicated organic ligand derived from the organic reactant. The experimental result demonstrates clearly that copperII plays an important role in this reaction.

Bis[4-(2-hydroxy­benzyl­amino)phen­yl] ether

The title compound, C26H24N2O3, was synthesized by reduction of the corresponding Schiff base. The molecule does not possess crystallographic or non-crystallographic symmetry. The dihedral angle between the oxygen-bridged benzene rings is 67.98u2005(8)°. Both hydroxyl groups are involved in O—H⋯O intramolecular hydrogen bonding. The molecules are linked into a two-dimensional network parallel to the (010) plane by N—H⋯O hydrogen bonds.

Bis[nitratobis(pentafluorobenzoato)(1,10-phenanthroline-κ2N,N′)manganese(II)] dinitratobis(1,10-phenanthroline-κ2N,N′)manganese(II)

The title compound, [Mn(C7F5O2)(NO3)(C12H8N2)2]2·[Mn(NO3)2(C12H8N2)2], contains two types of molxadecules: [Mn(phen)2(F5C6COO)(NO3)] (A) and [Mn(phen)2(NO3)2] (B) (phen = 1,10-phenanthroline) in a 2:1 ratio. Molxadecule B possesses a crystallographically imposed twofold rotation axis. The Mn ions in each of the two molxadecules are coordinated by four N atoms and two O atoms in a distorted octaxadhedral geometry. The crystal packing exhibits π⋯π interxadactions with relatively short distances of 3.6775u2005(14) and 3.8214u2005(13)u2005A between the centroids of six-membered rings from neighbouring molxadecules, and weak interxadmolecular C—H⋯O and C—H⋯F hydrogen bonds.