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In the title compound, [CoCl(C2H7N)(C3H10N2)2]Cl2, the CoIII ion has a distorted octa­hedral coordination environment and is surrounded by four N atoms in the equatorial plane, with the other N and Cl atoms occupying the axial positions. The crystal packing is stabilized by N—H...Cl hydrogen bonds, forming a layered arrangement parallel to (1-10).

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In the title compound, [CoCl(CH5N)(C3H10N2)2]Cl2·H2O, the CoIII ion has an octa­hedral coordination environment and is surrounded by four N atoms of two propane-1,3-diamine ligands in the equatorial plane, with another N atom of the methylamine ligand and a Cl atom occupying the axial positions. The crystal packing is stabilized by inter­molecular N—H...O, N—H...Cl, and O—H...Cl inter­actions, generating a three-dimensional network.

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In the title compound, [CoBr(CH5N)(C3H10N2)2]Br2, the cobaltIII ion has a distorted octa­hedral coordination environment and is surrounded by four N atoms in the equatorial plane, with an additional N atom and the Br atom occupying the axial positions. In the crystal, the complex cation and the two counter anions are linked via N—H...Br and C—H...Br hydrogen bonds, forming a three-dimensional network.

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The whole mol­ecule of the title compound, [NiCl2(C3H4N2)2(NH3)2], is generated by inversion symmetry. The NiII ion, which is located on an inversion center, has a distorted octa­hedral coordination environment and is surrounded by two ammine N atoms and two Cl atoms in the equatorial plane, with two N atoms of two imidazole groups occupying the axial positions. The imidazole ring makes a dihedral angle of 81.78 (18)° with the Ni/N/Cl equatorial plane. In the crystal, mol­ecules are linked via N—H...Cl hydrogen bonds and C—H...π inter­actions, forming a three-dimensional network.

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In the title compound, [Ni(C7H12N2)4(H2O)2]Cl2, the nickel(II) ion has a distorted octa­hedral coordination environment. It is surrounded by three N atoms and one O atom occupying the equatorial plane, and one N and one O atom in the axial positions. The imidazole ring systems are inclined to one another with dihedral angles varying between 38.3 (4) and 74.1 (4)°. In the crystal, mol­ecules are linked via O—H...Cl hydrogen bonds involving one Cl anion and the water mol­ecule in the equatorial plane, forming an inversion dimer-like arrangement. The water mol­ecule in the axial position is hydrogen-bonded to both Cl anions. There are also a number of C—H...Cl hydrogen bonds present, forming a three-dimensional structure. All four alkyl chains are disordered over two positions with refined occupancy ratios of 0.395 (15):0.605 (15), 0.658 (14):0.342 (14), 0.332 (11):0.668 (11) and 0.622 (12):0.378 (12).

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The title mol­ecule, [CoCl2(C5H5N)2(H2O)2], has -1 symmetry with the CoII ion situated on an inversion centre. The cation has a distorted octa­hedral coordination environment and is surrounded by two N and two Cl atoms in the equatorial plane, while the coordinating water O atoms occupy the axial positions. The crystal exhibits nonmerohedral twinning with two domain states, the volume fractions of which were refined to 0.883 (2) and 0.117 (3). The crystal packing is stabilized by O—H...Cl hydrogen-bond inter­actions, forming two-dimensional networks lying parallel to (001). The crystal packing also features π–π inter­actions between the pyridine rings, with centroid–centroid separations of 3.493 (3) and 3.545 (3) Å.
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