Bing-Yu Zhang

Poly[[tris­(μ3-2-oxidopyridinium-3-carboxyl­ato)manganese(II)sodium(I)] monohydrate]

In the crystal structure of the title compound, {[MnNa(C6H4NO3)3]·H2O}n, the MnII cation is located on a threefold rotation axis and is chelated by three 2-oxidopyridinium-3-carboxylate (opc) anions in an octahedal coordination. The NaI cation is located on a threefold rotation axis and is surrounded by six O atoms from three opc anions. The opc anions link the Mn and Na cations, forming a three-dimensional polymeric structure. The uncoordinated water molecule, located on a threefold rotation axis, is equally disordered over two sites. The three-dimensional network is consolidated by N—H⋯O hydrogen bonds.

Intramolecular π–π stacking in diaquabis(2-hydroxybenzoato-κO)bis(1,10-phenanthroline-κ2N,N′)strontium(II)

In the title compound, [Sr(C7H5O3)2(C12H8N2)2(H2O)2], the Sr(II) ion is located on a twofold rotation axis and assumes a distorted square-antiprism SrN4O4 coordination geometry, formed by two phenanthroline (phen) ligands, two 2-hydroxybenzoate anions and two water molecules. Within the mononuclear complex molecule, intramolecular pi-pi stacking is observed between nearly parallel coordinated phen ligands, while normal intermolecular pi-pi stacking occurs between parallel phen ligands of adjacent complex molecules. Classic O-H...O and weak C-H...O hydrogen bonding helps to stabilize the crystal structure.

Bis(pyrimidine-2-carboxyl­ato-κ2N,O)copper(II)

The title compound, [Cu(C5H3N2O2)2], was prepared in a water–ethanol solution containing 2-cyanopyrimidine, malonic acid and copper(II) nitrate trihydrate. The CuII ion, located on an inversion center, is chelated by two pyrimidine-2-carboxylate anions in a CuO2N2 square-planar geometry. The uncoordinated carboxylate O atom and pyrimidine N atoms are linked to adjacent pyrimidine rings via weak C—H⋯O and C—H⋯N hydrogen bonding. π–π Stacking is observed between nearly parallel pyrimidine rings, the centroid-to-centroid separation being 3.8605 (13) Å.

Bis[4-(4-pyridyl)pyridinium] μ-4,4′-bipyridine-bis­[tetra­aqua­(4,4′-bipyridine)manganese(II)] bis­(5-sulfonatobenzene-1,3-dicarboxyl­ate) 4,4′-bipyridine solvate penta­deca­hydrate

The crystal structure of the title compound, (C10H9N2)2[Mn2(C10H8N2)3(H2O)8](C8H3O7S)2·C10H8N2·15H2O, consists of dinuclear MnII complex cations, sulfonatobenzenedicarboxylate trianions, 4-(4-pyridyl)pyridinium cations, uncoordinated 4,4′-bipyridine and uncoordinated water molecules. One 4,4′-bipyridine molecule bridges two Mn atoms, forming a centrosymmetric dinuclear complex; the mid-point of the C—C bond linking the pyridine rings of the bridging ligand is located on an inversion center. Each MnII atom is coordinated by four water and two 4,4′-bipyridine molecules in a distorted octahedral geometry. The MnII atom deviates by 0.591 (5) and 0.209 (2) Å from the mean planes of the coordinated pyridine rings. In the 4-(4-pyridyl)pyridinium cation, the two pyridine rings are twisted with respect to each other, making dihedral angle of 34.78 (17)°. The uncoordinated bipyridine molecule is also centrosymmetric. One of uncoordinated water molecules has site symmetry 2, and the other uncoordinated water molecule is located close to an inversion center and its one H atom is disordered equally over two sites. Extensive π–π stacking between pyridine rings is observed and an extensive hydrogen-bonding network of the types N—H⋯N, O—H⋯N and O—H⋯O is present.

4-Acetyl­pyridine–fumaric acid (2/1)

In the crystal structure of the title cocrystal, 2C7H7NO·C4H4O4, the complete fumaric acid molecule is generated by a crystallographic inversion centre. The two components of the cocrystal are linked by an O—H⋯N hydrogen bond.

Tetra-aqua-(2,2'-bipyridine-κN,N')manganese(II) di-μ-aqua-bis-[aqua-(2,2'-bipyridine-κN,N')(5-sulfonatoisophthalato-κO)manganate(II)] tetra-hydrate.

The crystal structure of the title salt, [Mn(C10H8N2)(H2O)4][Mn2(C8H3O7S)2(C10H8N2)2(H2O)4]·4H2O, consists of mononuclear manganese(II) cations, dinuclear manganate(II) dianions and uncoordinated water molecules. The dianion is located about an inversion center; the MnII atom is coordinated by a 2,2′-bipyridine ligand, a sulfonatoisophthalate group, a water molecule along with two bridging water molecules in an octahedral geometry. The cation lies on a twofold rotation axis; the MnII atom is coordinated by four water molecules and a chelating 2,2′-bipyridine ligand in a distorted octahedral geometry. A partially overlapped arrangement between the bipyridine ligands and the aromatic ring of the sulfoisophthalate group of adjacent anions is observed; the distance (3.357 Å) indicates π–π stacking. Hydrogen bonds, with the water molecules serving as hydrogen-bond donors, lead to a three-dimensional network architecture.

Triaqua-(3-carb-oxy-5-sulfonatobenzoato-κO)(1,10-phenanthroline-κN,N')cobalt(II) monohydrate.

In the title compound, [Co(C8H4O7S)(C12H8N2)(H2O)3]·H2O, the CoII cation is coordinated by one sulfoisophthalate dianion, one bidentate phenathroline (phen) molecule and three water molecules in a distorted cis-CoN2O4 octahedral geometry. In the crystal structure, aromatic π–π stacking occurs [centroid–centroid distances 3.7630 (14) and 3.7269 (15) Å], as well as an extensive O—H⋯O and C—H⋯O hydrogen-bonding network

Bis(2,5-dihydroxy­benzoato-κO)bis­(1,10-phenathroline-κ2N,N′)cadmium(II) 1.25-hydrate

In the crystal structure of the title compound, [Cd(C7H5O4)2(C12H8N2)2]·1.25H2O, the Cd2+ cation is coordinated by two phenanthroline (phen) molecules and two 2,5-dihydroxybenzoate (dhba) anions in a distorted octahedral geometry. The centroid–centroid distances of 3.809 (2) and 3.680 (2) Å between nearly parallel pyridine rings of the phen ligands and the benzene rings of dhba anions indicate that the dhba anions are involved in π–π stacking in the crystal structure. The face-to-face separation of 3.35 (3) Å between parallel phen ring systems also suggests π–π stacking between adjacent complex molecules. The crystal structure contains extensive O—H⋯O and C—H⋯O hydrogen bonding.

Poly[octa-μ-aqua-tetra­aqua­bis(μ-5-sul­fon­atobenzene-1,3-dicarboxyl­ato)cobalt(II)tetra­sodium]

The title compound, [CoNa4(C8H3O7S)2(H2O)12]n, is a three-dimensional coordination polymer bridged by sulfoisophthalate trianions and water molecules. The CoII atom, located on an inversion centre, is coordinated by two carboxylate groups of the sulfoisophthalate trianions and by four water molecules in a distorted CoO6 octahedral geometry. Two independent NaI atoms also have a distorted octahedral coordination geometry formed by water, carboxylate O and sulfonate O atoms. An extensive O—H⋯O and C—H⋯O hydrogen-bonding network is present in the crystal structure, as well as weak π-π stacking [centroid–centroid distance = 3.9553 (11) Å].

Aqua­(2,2′-bipyridine)bis­(4-hydroxy­benzoato)zinc(II)

In the title complex, [Zn(C7H5O3)2(C10H8N2)(H2O)], the ZnII ion is coordinated by two 4-hydroxybenzoate anions, one 2,2′-bipyridine molecule and one water molecule and displays a distorted octahedral geometry. One Zn—O bond [2.5300 (15) Å] is much longer than the others in the molecule. In the crystal structure, the face-to-face separation of 3.547 (9) Å suggests no π–π stacking between parallel bipyridine ring systems, and an extensive O—H⋯O hydrogen-bonding network between the coordinated water molecule, the phenol group and carboxylate O atoms is present.