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The crystal structure of the title compound, [Cu(H2O)6](BF4)2·3C4H4N2O2, comprises discrete [Cu(H2O)6]2+ cations and BF4 anions along with three equivalents of pyrazine 1,4-dioxide (pzdo). The hexa­aqua­copper(II) ion and all three pzdo mol­ecules lie about crystallographic inversion centers. The lattice is supported by an extensive hydrogen-bonding network. O—H...O hydrogen bonding between the [Cu(H2O)6]2+ and pzdo units creates a pseudo-hexa­gonal lattice parallel to the bc plane. The BF4 anions lie in the voids of that lattice, held in place by O—H...F hydrogen bonds, and also generate BF4–pzdo–BF4–pzdo stacks via short F...N contacts [2.866 (3)–3.283 (4) Å].

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The crystal structure of the title salt, C12H9N2+·HSO4·H2O, comprises inversion-related pairs of phenazinium ions linked by C—H...N hydrogen bonds. The phenazinium N—H atoms are hydrogen bonded to the bis­ulfate anions. The bis­ulfate anions and water mol­ecules are linked by O—H...O hydrogen-bonding inter­actions into a structural ladder motif parallel to the a axis.

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The title compound, [Cu(C12H8N3O2)(N3)(H2O)], was formed by the air oxidation of 2-(amino­meth­yl)pyridine in 95% ethanol in the presence of copper(II) nitrate and sodium azide with condensation of the resulting picolinamide mol­ecules to generate the imide moiety. The CuII ion has a square-pyramidal coordination sphere, the basal plane being occupied by four N atoms [two pyridine (py) N atoms, the imide N atom and an azide N atom] in a nearly planar array [mean deviation = 0.048 (6) Å] with the CuII ion displaced slightly from the plane [0.167 (5) Å] toward the fifth ligand. The apical position is occupied by a coordinating water mol­ecule [Cu—O = 2.319 (4) Å]. The crystal structure is stabilized by hydrogen-bonding inter­actions between the water mol­ecules and carbonyl O atoms. The inversion-related square-pyramidal complex molecules pack base-to-base with long Cu...Npy contact distances of 3.537 (9) Å, preventing coordination of a sixth ligand.
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