metal-organic compounds
Open access
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—HO 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—HF hydrogen bonds, and also generate BF4−–pzdo–BF4−–pzdo stacks via short FN contacts [2.866 (3)–3.283 (4) Å].
organic compounds
Open access
The crystal structure of the title salt, C12H9N2+·HSO4−·H2O, comprises inversion-related pairs of phenazinium ions linked by C—HN hydrogen bonds. The phenazinium N—H atoms are hydrogen bonded to the bisulfate anions. The bisulfate anions and water molecules are linked by O—HO hydrogen-bonding interactions into a structural ladder motif parallel to the a axis.
metal-organic compounds
Open access
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 CuNpy contact distances of 3.537 (9) Å, preventing coordination of a sixth ligand.