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In the title complex, [Ni(C12H14N3O3)(C2H3O2)(C5H5N)2], the NiII atom is six-coordinated by two N atoms and one O atom from a tridentate hydrazone ligand, two N atoms from two pyridine molecules, and one O atom from an acetate group, leading to a distorted octahedral geometry. The two N atoms of the pyridine molecules occupy the axial sites and the other four coordinated atoms define the equatorial plane. The uncoordinated acetate O atom forms an intramolecular hydrogen bond with the oxime O atom of the hydrazone ligand.

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In the title compound, [Cd(C9H6O5)(C3H4N2)(H2O)2]·3H2O, the carboxyl­ato­phenoxy­acetate dianion links the water- and imidazole-coordinated Cd atoms into a zigzag chain that runs along the c axis of the monoclinic unit cell; the chelation by the carboxyl­ate arms leads to a seven-coordinate pentagonal–bipyramidal geometry for the Cd atom. The chains are linked into a three-dimensional network by hydrogen bonds.

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The VV atom in the title complex, [V(C13H9NO2)(C13H10NO2)O], is coordinated by two O atoms and one N atom of the tridentate Schiff base ligand, and by two O atoms of the bidentate hydro­xamate co-ligand, defining a distorted octa­hedral VO(ONO)(OO) geometry.

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In the title centrosymmetric dimeric complex, [V2(C12H13N3O3)2(CH3O)2O2], each VV atom is six-coordinated by one oxo O atom, two N atoms and one O atom of the tridentate hydrazone ligand and two O atoms of two methoxo groups, leading to a distorted octa­hedral environment. Two VV atoms are bridged by methoxo groups, resulting in a dimer, with a V...V separation of 3.324 (3) Å.

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In the title coordination polymer, [Zn(C9H6O5)(C8H12N2)]n, the ZnII atom is surrounded by two chelating 3-carboxyl­atophenoxy­acetate (3-CPOA) dianions and one 1,10-phenanthroline (phen) ligand. Adjacent ZnII atoms are bridged by 3-CPOA to form a zigzag chain structure. The polymeric chains are connected via π–π stacking inter­actions.

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In the mononuclear title compound, [La(NO3)3(C5H5NO)2(H2O)2], the LaIII atom is ten-coordinate, with a coordination polyhedron made up of the O atoms of two 4-pyridone ligands, six O atoms of three O,O′-chelating nitrate groups and two water mol­ecules, the polyhedron approximating a dodeca­hedron. The mol­ecule lies on a twofold rotation axis. A three-dimensional network structure is formed by hydrogen-bonding and π–π stacking inter­actions.

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The crystal structure of the title complex, [Co(C9H7O5)2(C10H8N2)2(H2O)2]·4H2O or [Co(4-CPOAH)2(4,4′-bipy)2(H2O)2]·4H2O (4,4′-bipy is 4,4′-bipyridine and 4-CPOAH is the 4-carboxy­phenoxy­acetate monoanion), consists of two independent mononuclear mol­ecules that inter­act through the uncoordinated water mol­ecules. The CoII atoms lie on inversion centers and display an octa­hedral geometry defined by two oxyacetate O atoms of 4-CPOAH groups, two N atoms of 4,4′-bipy ligands and two water mol­ecules. A three-dimensional supramolecular network structure is formed through hydrogen-bonding inter­actions.

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The title compound, (C5H9N2)2(H3O)2[Mo8O26]·2C2H6O, consists of centrosymmetric β-Mo8O264− anions, 3,5-dimethyl­pyrazolium cations, H3O+ cations and ethanol solvent mol­ecules, linked through hydrogen bonding into a two-dimensional network.

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In the title salt adduct, 2H3O+·C10H6O6S22-·2C3H7NO, the 1,5-naphthalene­disulfonate dianion lies on an inversion center. Inter­molecular inter­actions link two hydroxonium cations, one 1,5-naphthalene­disulfonate dianion and two N,N-dimethyl­formamide mol­ecules into a short hydrogen-bonded chain. A supramolecular hydrogen-bonding network structure is formed via further inter­molecular hydrogen bonds.
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