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In the title compound, tetra­ammonium octamolybdate bis(2-methyl­benz­imidazole), (NH4)4[Mo8O26]·2C8H8N2, the crystal packing is stabilized by N—H...O, N—H...N and C—H...O intra- and intermolecular hydrogen bonds, as well as π–π stacking. The anion lies on an inversion center.

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The asymmetric unit of the new title melaminium salt, C3H7N6+·C7H7O3S-·H2O, comprises a melaminium cation, a 4-methyl­benzene­sulfonate anion and a water mol­ecule. Extensive intermolecular interactions, including hydrogen bonding, feature in the crystal structure.

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In the title compound, [Cu(C2H6N5)2]·2H2O, the Cu2+ cation, lying at a centre of symmetry, is coordinated by four N atoms from two bidenate ligands, forming a square-planar complex. The deprotonation of the ligand causes an increase in π-conjugation. Hydrogen bonds between solvent water and the complex help to stabilize the three-dimensional network structure.

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The title compound, [Cu2(OH)2(C12H8N2)2(H2O)2](C8H4O4)·8H2O, was prepared by the hydro­thermal reaction of CuCl2, 1,10-phenanthroline, terephthalic acid and water at 443 K. It consists of a double-hydroxo-bridged dinuclear complex cation [Cu...Cu = 2.911 (3) Å], a terephthalate anion and eight water mol­ecules. Both cation and anion possess inversion symmetry. A network of O—H...O hydrogen bonds stabilizes the structure.

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In the title compound, [CoCl(C24H21N7)]2[CoCl4]·4CH3OH, the crystal packing is stabilized by O—H...Cl, N—H...Cl and N—H...O hydrogen bonds, weak C—H...Cl inter­actions, and π–π stacking. The anion lies on a twofold rotation axis.

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In the title compound, [Ni(C2H6N5)2]·2H2O, the Ni cation (site symmetry \overline{1}) is coordinated by four N atoms from two bidenate ligands in a square-planar arrangement. A network of O—H...N, N—H...N and N—H...O hydrogen bonds helps to consolidate the crystal packing.
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