Xiu-Guang Wang

The first 2D trinuclear Cd(II)-complex with adenine nucleobase: hydrothermal synthesis, crystal structure and fluorescent properties

The first 2D aggregate, {[Cd3(μ3-ade)2(ap)2(H2O)2]·1.5H2O}n (1) (where adeH = adenine; H2ap = adipic acid), with trinuclear Cd(II) as secondary building units, has been successfully synthesized, the compound shows scarce coordination modes (tridentate μ3-N3,N7,N9 for ade and hexadentate η1:η2:η2:η1 for flexible ap) and a novel crystal packing arrangement, exhibiting strong fluorescent emission properties.

catena-Poly[[[aqua(5-amino-1H-1,2,4-triazole-κN4)zinc(II)]-μ-5-carboxy­benzene-1,3-dicarboxyl­ato] dihydrate]

The structure of the title complex, {[Zn(C9H4O6)(C2H4N4)(H2O)]·2H2O}n, contains extended one-dimensional chains with 5-carboxyxadbenzene-1,3-dicarboxylxadate anions bridging ZnII atoms. The unique ZnII atom is in a distorted tetraxadhedral coordination environment. In the crystal structure, interxadmolecular N—H⋯O, O—H⋯O and O—H⋯N hydrogen bonds link the chains and solvent water molxadecules into a three-dimensional network.

Benzimidazolium 3,5-dicarb-oxy-benzoate trihydrate.

Cocrystallization of benzimidazole with benzene 1,3,5-tricarboxylic acid in slightly basic medium afforded the title compound, C7H7N2 +·C9H5O6 −·3H2O, in which one of the imidazole N atom is protonated and one carboxylic group of aromatic acid is deprotonated. In the crystal structure, intermolecular N—H⋯O hydrogen-bonding connects the two organic components into dimers, which are further linked into a three-dimensional network by O—H⋯O and N—H⋯O interactions between the water molecules and the dimers.

Bis(2-amino-6-methyl-1,3-benzothia-zole-κN)bis-(4-nitro-benzoato-κO)zinc.

In the title mononuclear complex, [Zn(C7H4NO4)2(C8H8N2S)2], the ZnII atom is coordinated by two N atoms from two 2-amino-6-methyl-1,3-benzothiazole and by two carboxylate O atoms from two 4-nitrobenzoate ligands, adopting a slightly distorted tetrahedral coordination geometry. In the crystal, intermolecular N—H⋯O hydrogen bonds between the amino group of 2-amino-6-methyl-1,3-benzothiazole and the carboxylate group of 4-nitrobenzoate link these discrete mononuclear units into a one-dimensional supramolecular chain extending parallel to [100].

Tetra­aqua­bis­[2-(4-pyridyl­sulfan­yl)acetato-κN]nickel(II)

In the centrosymmetric title complex, [Ni(C7H6NO2S)2(H2O)4], the NiII atom, located on a centre of inversion, is coordinated by two N atoms from two 2-(4-pyridylsulfanyl)acetate ligands and four water O atoms in an octahedral geometry. In the crystal, intermolecular O—H⋯O hydrogen bonds between the coordinated water molecules and the carboxylate group of the anionic 2-(4-pyridylsulfanyl)acetate ligands link these discrete mononuclear units into a three-dimensional network.

Tetraaquabis(4,4′-bipyridine)cobalt(II) 2-aminonaphthalene-1-sulfonate hexahydrate

The title compound, [Co(C10H8N2)2(H2O)4](C10H8NO3S)2·6H2O, contains a tetraxadaquaxadbis(4,4′-bipyridine)xadcobalt(II) cation, two ANS− anions (HANS = 2-aminoxadnaphthalene-1-sulfonic acid) and six solvent water molxadecules. The CoII atom lies on an inversion centre and is coordinated octahedrally by two mutually trans 4,4′-bipyridine molxadecules bound in a monodentate fashion and by four water molxadecules in the equatorial plane. The cations and water molxadecules are arranged into infinite two-dimensional layers by an extensive network of hydrogen bonds. The ANS− anions are trapped between these layers via N—H⋯O interxadactions between the amino groups and the solvent and coordinated water molxadecules. Adjacent layers are stacked via weak π–π interxadactions between 4,4′-bipyridine molxadecules [nearest centroid-to-centroid distance 3.662u2005(0)u2005A].

1,4-Bis(4H-1,2,4-triazol-4-yl)benzene dihydrate

The asymmetric unit of the title compound, C10H8N6·2H2O, comprises half the organic species, the molecule being completed by inversion symmetry, and one water molecule. The dihedral angle between the 1,2,4-triazole ring and the central benzene ring is 32.2u2005(2)°. The water molecules form O—H⋯N hydrogen bonds with N-atom acceptors of the triazole rings. C—H⋯N hydrogen bonds are also observed, giving a three-dimensional framework.

Diaqua­bis­[5-(2-pyridyl­meth­yl)tetra­zol­ato-κ2 N 1,N 5]zinc(II)

In the title mononuclear complex, [Zn(C7H6N5)2(H2O)2], the ZnII atom, located on an inversion centre, is in a distorted octahedral coordination geometry formed by four N atoms from two chelating 5-(2-pyridylmethyl)tetrazolate ligands and two O donors from two water molecules. Intermolecular O—H⋯N hydrogen bonds between the coordinated water molecule and the tetrazolyl group of the 5-(2-pyridylmethyl)tetrazolate ligand lead to the formation of a three-dimensional network.

catena-Poly[[bis­(N,N-dimethyl­formamide)manganese(II)]-di-μ2-oxalato]

The title complex, [Mn(C2O4)(C3H7NO)2]n, forms extended one-dimensional chains with oxalate dianions bridging MnII atoms in a bis-bidentate mode. The unique MnII atom lies on a crystallographic twofold axis and is in a distorted octaxadhedral coordination environment. There is a single weak intraxadmolecular C—H⋯O hydrogen-bond interxadaction [H⋯O = 2.38u2005A].