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In the title compound, [Cu(C7H6N2O3)(C6H8N2)(H2O)], the CuII ion is in a distorted square-pyramidal N3O2 environment formed by two bidentate chelating ligands in the equatorial coordination sites and one water mol­ecule in the apical direction. In the crystal, O—H...O, N—H...O and O—H...N hydrogen bonds link the complex mol­ecules into a three-dimensional supra­molecular network.

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In the title binuclear complex, [Cu2(NO3)3(C18H16N6Se)(H2O)3]NO3·H2O, the CuII ions are penta­coordinated in a tetra­gonal–pyramidal geometry. In both cases, the equatorial planes are formed by a chelating pyrazole-pyridine group, a water mol­ecule and a nitrate O atom, whereas the apical positions are occupied by a water mol­ecule for one CuII ion and a nitrate O atom for the other. The organic selenide ligand adopts a trans configuration with respect to the C–Se–C plane. Numerous inter­molecular O—H...O and N—H...O hydrogen bonds between the coordinating and lattice water mol­ecules, nitrate anions and pyrazole groups are observed. π–π stacking inter­actions between the pyridine rings [averaged centroid–centroid distance = 3.652 (5) Å] are also present. The lattice water molecule is equally disordered over two sets of sites.

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In the title compound, 2C10H15N4Se+·Cl·OH, a singly protonated mol­ecule of the organic selenide participates in hydrogen bonding with neighboring mol­ecules, forming zigzag chains along [001]. The molecule adapts a cis bridging mode with a C—Se—C angle of 102.13 (15)°. π–π stacking inter­actions are observed between the closest pyrazole rings of neighboring chains [centroid–centroid distance = 3.888 (1) Å] and hydrogen bonding occurs through bridging chloride anions and hydroxide groups. Additionally, O—H...Cl hydrogen bonds are formed.
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