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In the crystal structure of the title compound, K2[Ni(C16H14N2O2)]6[Ni(CN)4]·6CH3OH·2H2O, at 180 K, the nickel(II)-Schiff base units form dimeric associations across inversion centres. The K+ cations occupy distorted octahedral sites surrounded by O atoms of the nickel(II)-Schiff base units, and the centrosymmetric [Ni(CN)4]2- anions participate in a two-dimensional hydrogen-bond network that includes the uncoordinated methanol and water molecules.

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The title vanadium complex, [VClO(C16H22N4)]ClO4, of the tetradentate ligand N,N'-di­methyl-N,N'-bis(2-pyridyl­methyl)­ethane-1,2-di­amine was obtained from air oxidation of a mixture of the ligand and VCl3 in wet methanol.

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The title copper complex, [Cu(C2H3O2)(CH4O)(C18H17N3)]PF6, of the tridentate ligand N-phenyl-N,N-bis(2-pyridyl­methyl)­amine (phbpa), displays a distorted octahedral coord­ination geometry in which the κ2O,O′-acetate ligand approaches a κO-binding arrangement. One O atom of the acetate group also accepts an O—H...O hydrogen bond [O...O = 2.654 (2) Å] from a coordinated methanol mol­ecule in a neighbouring complex.

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In the crystal structure of the title compound, C14H17N3O22+·2ClO4, at 180 K, O—H...O hydrogen-bonded di­mers are formed across inversion centres.

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In the title complex, [Cu2(CHO3)(C36H54N8)](ClO4)3·C2H3N, at 180 K, the triamino caps of the dicopper(II) cryptate are approximately eclipsed and the benzene rings are arranged so as to form three arms of a twisted tris­kelion motif. The coordination geometry of one Cu atom is trigonal–bipyram­idal, while the second resembles more closely a square pyramid. The latter arrangement accommodates a perchlorate anion coordinated loosely to Cu to give a very distorted octa­hedral geometry. The cryptate complexes adopt an approximately hexa­gonal close-packed (hcp) arrangement.

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In the crystal structure of the title compound, [Co(C14H30N8O4)]Br3, at 180 K, the cationic complexes lie on twofold rotation axes, and bromide anions lie either on twofold rotation axes or in general positions.
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