ZnII Atom Research Articles

Catena-Poly[[zinc-bis(μ-2-sulfido-1H-benzimidazol-3-ium-5-carboxylato)-κ2O:S;κ2S:O] trihydrate

In the title compound, {[Zn(C8H5N2O2S)2]·3H2O}n, the ZnII atom, lying on a twofold rotation axis, is four-coordinated by two S atoms and two O atoms from four 2-sulfido-1H-benzimidazol-3-ium-5-carboxyl­ate (H2mbidc) ligands in a distorted tetra­hedral geometry. Two H2mbidc ligands bridge two ZnII atoms, generating a double-chain along [01]. Adjacent chains are linked by N—H⋯O and O—H⋯O hydrogen bonds, forming a three-dimensional supra­molecular network. One of the two water molecules also lies on a twofold rotation axis.

Bis[μ-N,N′-bis(quinolin-8-yl)pyridine-2,6-dicarboxamido]dizinc(II) dichloromethane disolvate

The title compound, [Zn(2)(C(25)H(15)N(5)O(2))(2)]·2CH(2)Cl(2), is a dinuclear double-helical complex which lies on a crystallographic twofold axis. In the complex, both ligands are partitioned into two tridentate domains which allow each ligand to bridge both metal centres. Each Zn(II) atom is six-coordinated in a distorted octahedral environment formed by two amide N atoms, two quinoline N atoms and two pyridine N atoms from two different ligand molecules, with the central pyridine ring, unusually, bridging two Zn(II) atoms. The deprotonated ligand is not planar, the amide side chains being considerably twisted out from the plane of the central pyridine ring.

(4-Chloro-2-{[(pyridin-2-ylmethyl)imino]methyl}phenolato)iodido(methanol)zinc(II)

The title Schiff base zinc(II) complex, [Zn(C13H10ClN2O)I(CH3OH)], was synthesized by the reaction of 5-chloro­salicyl­aldehyde, 2-amino­methyl­pyridine and zinc iodide in methanol. The ZnII atom is five-coordinated by one phenolate O atom, one imine and one pyridine N atom of the Schiff base ligand, one methanol O atom and one I atom, forming a distorted square-pyramidal geometry, with the I atom at the apical site. The dihedral angle between the benzene and pyridine rings is 22.9 (2)°. In the crystal, centrosymmetrically related mol­ecules are linked through inter­molecular O—H⋯O hydrogen bonds, forming dimers.

Bis(2-amino-1,3-thia-zole-κN)diazido-zinc.

In the title complex, [Zn(N3)2(C3H4N2S)2], the ZnII atom is tetra­hedrally coordinated by two terminal azide ligands and by the ring N atoms of two different 2-amino­thia­zole ligands. Intra­molecular N—H⋯N hydrogen bonds between the amino groups of both 2-amino­thia­zole ligands and the N atom of one of the azide ligands ensure that the heterocyclic rings are oriented in the same direction. Inter­molecular N—H⋯N hydrogen bonds link the mol­ecules into zigzag sheets in the ac plane.

Synthesis of Monohydroxy-Substituted Diarylporphyrins and Their Binding Ability towards Aminobenzoic Acids

Porphyrins are widely used for binding of amino acids which usually occurs due to donor-acceptor interaction between NH-groups of amino acid and ZnII atom of metalloporphyrinate.[1,2] In the case of zinc porphyrinates with OH groups the possibility of additional hydrogen bonds formation between the hydroxyl groups of porphyrinate and oxygen atom of amino acid appears. Hydrogen bonds in the resulting molecular complex make it significantly more stable. When porphyrins form hydrogen bonds with amino acids (or with other biological objects) they are considered to be capable of recognizing the given substrates, and the higher the complex stability, the better is the recognizing ability of this porphyrin. This work is devoted to the synthesis of new monohydroxysubstituted zinc porphyrinates with different positions of reactionary centres and investigation of their binding ability towards amino acids. To this end we used synthetic approach on the basis of key 10-arylsubstituted a,c-biladiene dihydrobromides which according to the literature data are widely employed for obtaining of mono-functionalized porphyrins.[3-6] By the method of spectrophotometric titration and 1H NMR spectroscopy a binding ability of the zinc porphyrinates (ZnP) regarding to the methyl esters of ortho(L1), meta(L2), and para(L3) aminobenzoic acids in toluene have been studied.

Aqua(4-nitrophthalato)bis[2-(1H-pyrazol-3-yl)pyridine]zinc(II) hemihydrate

In the title compound, [Zn(C8H3NO6)(C8H7N3)2(H2O)]·0.5H2O, the ZnII atom shows a distorted octa­hedral ZnN4O2 coordination environment and is bonded to two 3-(2-pyrid­yl)-1H-pyrazole ligands via the N atoms, one monodentate 4-nitro­phthalate ligand and one associated water mol­ecule. Additionally, one water of crystallization, with a site-occupation factor of 0.5, is present. The two 3-(2-pyrid­yl)-1H-pyrazole ligands are planar [r.m.s. deviations = 0.03 (1) and 0.35 (1) Å] and the dihedral angle between the two planar 3-(2-pyrid­yl)-1H-pyrazole ligands is 67.31 (4)°. Inter­molecular π–π stacking inter­actions between 3-(2-pyrid­yl)-1H-pyrazole ligands with a face-to-face separation of 3.64 (1) Å are observed. Moreover, the crystal structure is stabilized by O—H⋯O and N—H⋯O hydrogen bonds between the water of crystallization, the associated water mol­ecule and the 3-(2-pyrid­yl)-1H-pyrazole ligands.

Bis{2-[3-(dimethylamino)propyliminomethyl]-6-methoxyphenolato}-κ3N,N′,O1;κ2N,O1-zinc(II) dihydrate

In the title mononuclear ZnII complex, [Zn(C13H19N2O2)2]·2H2O, the ZnII atom is coordinated by two O atoms and three N atoms from two crystallographically different Schiff base ligands in a distorted trigonal–bipyramidal environment. One O and two N atoms constitute the base of the pyramid, and one O and one N atoms occupy the apical positions. Inter­molecular O—H⋯O and O—H⋯N hydrogen bonds between the lattice water mol­ecules and N/O atoms of the Schiff base ligands stabilize the conformation, whereas inter­molecular O—H⋯O hydrogen bonds between the two lattice water mol­ecules lead to a chain structure in [001].

Dibromidobis(1-ethyl-2,6-dimethylpyridinium-4-olate-κO)zinc(II)

In the bioactive title compound, [ZnBr2(C9H13NO)2], the ZnII atom is coordinated in a distorted tetra­hedral arrangement by two Br− anions and the O atoms of two zwitterionic organic ligands. The pyridinium rings are almost planar [maximum deviations = 0.004 (4) and 0.003 (4) Å]. The ethyl groups are approximately perpendicular to the corresponding pyridinium ring planes [N—C—C—C = 88.8 (4)° in each ligand]. The packing of the mol­ecules is controlled by π–π inter­actions, with centroid–centroid distances of 3.625 (3) and 3.711 (2) Å, forming chains approximately parallel to (102). The crystal studied was non-merohedrally twinned (twin relationship between the domains 1 0 0, 0 1 0, −0.4672 −0.1864 −1 and batch scale factor of 7.39%).

Poly[tetraaquabis(μ3-benzene-1,3-dicarboxylato-κ3O:O′:O′′)bis(μ2-benzene-1,3-dicarboxylato-κ3O,O′:O′′)[μ2-1,4-bis(1,2,4-triazol-1-yl)butane-κ2N:N′]tetrazinc(II)

In the crystal structure of the title compound, [Zn4(C8H4O4)4(C8H12N6)(H2O)4]n, one ZnII atom is four-coordinated in a slightly distorted tetra­hedral geometry by two O atoms from benzene-1,3-dicarboxyl­ate (BDC) ligands, one N atom from a 1,4-bis­(1,2,4-triazol-1-yl)butane (BTB) ligand and one water mol­ecule, while a second ZnII atom is five-coordinated in a distorted square-pyramidal geometry bridged by four O atoms from BDC ligands and one water mol­ecule. The ZnII atoms are connected by the benzene-1,3-dicarboxyl­ate anions and the nitro­gen ligand into layers parallel to the ac plane. The asymmetric unit consits of two crystallographically independent ZnII cations, two BDC anions and two water mol­ecules in general positions, as well as one-half of the BTB ligand that is completed by inversion symmetry.

Bis(μ-4-amino-3,5-dimethyl-4H-1,2,4-triazole)bis[diiodidozinc(II)

In the title compound, [Zn2I4(C4H8N4)2], the ZnII atom is coordinated in a distorted tetra­hedral geometry by two N atoms from the triazole rings of two 4-amino-3,5-dimethyl-4H-1,2,4-triazole (admt) ligands and two iodide ligands. Doubly bridging admt ligands connect two ZnII atoms, forming a centrosymmetric dimer. Weak N—H⋯I and C—H⋯I hydrogen bonds play an important role in the inter­molecular packing.

Syntheses and Characterizations of two Zinc(II) Metal‐organic Frameworks based on 1,4‐Naphthalenedicarboxylate and Imidazole Ligands

AbstractTwo new compounds, namely [Zn(1,4‐ndc)(L1)] (1), and [Zn(1,4‐ndc)(L2)]·0.25H2O (2) [L1 = 2‐phenylimidazole, L2 = 1,1′‐(1,4‐butanediyl)bis(imidazole), and 1,4‐ndc = 1,4‐naphthalenedicarboxylate] were successfully synthesized under similar hydrothermal conditions. In compound 1, each 1,4‐ndc anion links two neighboring ZnII cations with its carboxylate groups to generate a 2D layer structure. The L1 ligands are attached on both sides of the layers. In compound 2, each carboxylate group of 1,4‐ndc connects one ZnII atom in monodentate mode to form a 1D zigzag chain. Further, the L2 ligands link the chains to generate an expanded diamond net. Four diamond networks interweave to form a 3D interpenetrating diamond framework in an unusual [2+2] mode. Furthermore, the title compounds exhibit good luminescent properties in the range from ultraviolet to visible light and may find potential applications as fluorescent materials.

(2,2′-Biquinoline-κ2N,N′)dibromidozinc(II)

In the title compound, [ZnBr2(C18H12N2)], the ZnII atom is four-coordinated in a distorted tetra­hedral configuration by two N atoms from the 2,2′-biquinoline ligand and two terminal Br atoms. The crystal packing is stabilized by weak inter­molecular C—H⋯Br hydrogen bonds and extensive inter­molecular π–π contacts between the pyridine and benzene rings [centroid–centroid distances = 3.775 (4), 3.748 (4), 3.735 (4), 3.538 (4), 3.678 (4) and 3.513 (4) Å].

Chlorido(pyridine-2-carboximidamide-κ2N1,N2)zinc(II) chloride dihydrate

In the title salt, [ZnCl(C6H7N3)2]Cl·2H2O, the pyridine-2-carboximidamide ligands chelate to the ZnII atom, which is also coordinated by a Cl atom. The ZnII atom shows a trigonal–bipyramidal coordination, with the pyridyl N atoms occupying the axial positions. The cation, anion and water mol­ecules are linked by N—H⋯Cl, N—H⋯O, O—H⋯Cl and O—H⋯O hydrogen bonds into a three-dimensional structure.

Catena-Poly[[dichloridozinc(II)]-μ-1,4-bis(1H-imidazol-1-yl)benzene

In the title one-dimensional coordination polymer, [ZnCl2(C12H10N4)]n, the ZnII atom (site symmetry 2) is coordinated by two chloride ions and two 1,4-bis­(imidazol-1-yl)benzene ligands, generating a distorted tetra­hedral ZnCl2N2 geometry for the metal ion. The bridging ligand, which is completed by crystallographic inversion symmetry, links the ZnII atoms into zigzag chains propagating in [101]. Within the ligand, the dihedral angle between the central benzene ring and terminal imidazole ring is 27.82 (13)°.

Aqua(4-bromobenzoato-κO)bis(1,10-phenanthroline-κ2N,N′)zinc(II) 4-bromobenzoate 1.5-hydrate

In the title compound, [Zn(C7H4BrO2)(C12H8N2)2(H2O)](C7H4BrO2)·1.5H2O, the ZnII atom is coordinated by four N atoms from two chelating 1,10-phenanthroline (phen) ligands, one O atom from a 4-bromo­benzoate ligand and one water mol­ecule, completing a distorted ZnN4O2 octa­hedral geometry. The two phen ligands exhibit nearly perfect coplanarity (r.m.s. deviations = 0.027 and 0.031 Å), making a dihedral angle of 85.7 (1)°. The mean inter­planar distances of 3.36 (2) and 3.41 (3) Å between adjacent phen ligands indicate π–π stacking inter­actions. The uncoordinated water mol­ecules are partly occupied. One carboxyl­ate O atom and two Br atoms are each disordered over two sites, with occupancy factors of 0.60 and 0.40. In the crystal structure, O—H⋯O and C—H⋯O hydrogen bonds and π–π stacking inter­actions link the complex cations, uncoordinated 4-bromo­benzoate anions and water mol­ecules into a three-dimensional supra­molecular network. An intra­molecular O—H⋯·O hydrogen bond is observed in the cation.

Bis[2-(4-benzoyloxy-2-hydroxybenzoyl)-1-phenylethenolato]diethanolzinc(II)

The mononuclear title complex, [Zn(C22H15O5)2(C2H5OH)2], contains a ZnII atom (site symmetry ) surrounded by six O atoms of the keto groups of two substituted 1,3-diketonate ligands and of two ethanol mol­ecules, resulting in a distorted octa­hedral coordination environment. The mol­ecular configuration is stabilized by an intra­molecular hydrogen bond between the phenolic hy­droxy group and the adjacent keto group. The hy­droxy group acts likewise as an acceptor of an inter­molecular O—H⋯O hydrogen bond with the hy­droxy group of the ethanol mol­ecule as the donor. The hydrogen-bonding scheme leads to the formation of supra­molecular layers parallel to (010).

Trans-Diaquabis[5-carboxy-4-carboxylato-2-(4-pyridinio)-1H-imidazol-1-ido-κ2N3,O4]zinc(II)

In the title complex, [Zn(C10H6N3O4)2(H2O)2], the ZnII atom is located on a twofold rotation axis and is coordinated by two trans-positioned N,O-bidentate and zwitterionic 5-carb­oxy-4-carboxyl­ato-2-(4-pyridinio)-1H-imidazol-1-ide (H2PIDC−) ligands and two water mol­ecules, defining a distorted octa­hedral environment. The complete solid-state structure can be described as a three-dimensional supra­molecular framework, stabilized by extensive hydrogen-bonding inter­actions involving the coordinated water mol­ecules, uncoordin­ated imidazole N atom, protonated pyridine N and carboxyl­ate O atoms of the H2PIDC− ligands.

Bis[(2-aminophenyl)methanol-κ2N,O]bis(nitrato-κO)zinc(II)

In the title compound, [Zn(NO3)2(C7H9NO)2], the ZnII atom, lying on a twofold rotation axis, is six-coordinated in a distorted octa­hedral geometry by two N atoms and two O atoms from two (2-amino­phen­yl)methanol ligands and two O atoms from two monodentate nitrate anions. Inter­molecular N—H⋯O, O—H⋯O and C—H⋯O hydrogen bonds stabilize the crystal structure.

Diaquabis(4-carboxy-2-propyl-1H-imidazole-5-carboxylato-κ2N3,O4)zinc(II)N,N-dimethylformamide disolvate

In the crystal structure of the title compound, [Zn(C8H9N2O4)2(H2O)2]·2C3H7NO, the ZnII atom is coordinated by two N,O-bidentate 2-propyl-1H-imidazole-4,5-dicarboxyl­ate anions and two water mol­ecules in a distorted octa­hedral environment. The asymmetric unit consists of one ZnII atom located on a center of inversion as well as one anion, one water mol­ecule and one additional dimethyl­formamide mol­ecule that occupy general positions. Between the carboxyl and the carboxyl­ate group an intra­molecular hydrogen bond is found in which the hydroxy H atom is disordered. Disorder is also found for the H atoms of one of the three methyl groups. In the crystal structure, additional inter­molecular N—H⋯O and O—H⋯O hydrogen bonding is found.

Pentaaqua[2-(5-carboxylato-2-oxido-1-pyridinio)acetato]zinc(II) monohydrate

In the title compound, [Zn(C8H5NO5)(H2O)5]·H2O, the ZnII atom is coordinated by one O atom from the 2-(5-carboxyl­ato-2-oxidopyridinium-1-yl)acetate ligand and by five water mol­ecules, forming a distorted octa­hedral geometry. Coordinated and uncoordinated water mol­ecules form O—H⋯O hydrogen bonds, leading to a three-dimensional framework.