Kateryna A. Ohui

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The crystal structure of the title compound, C6H6N2O2·H2O, consists of N-hy-droxy-picolinamide and water mol-ecules connected through O-H⋯O and N-H⋯N hydrogen bonds. The O-H⋯O inter-actions and π-π stacking inter-actions between the pyridine rings [centroid-centroid distance = 3.427 (1) Å] organize the components into columns extending along the b axis and(More)
The title compound, C23H25N3O, crystallized with one single mol-ecule in the asymmetric unit and is present in the zwitterionic form. There is an intra-molecular N-H⋯O hydrogen bond in the mol-ecule with the phenol ring being inclined to the central benzene ring by 20.67 (14)°. The terminal amino-phenyl ring forms a dihedral angle of 54.21 (14)° with the(More)
In the cation of the title salt, C10H10N3 (+)·C6H2N3O7 (-), the pyridine and pyridinium rings are linked by an intra-molecular N-H⋯N hydrogen bond and are approximately coplanar, with a dihedral angle between their planes of 4.24 (6)°. In the crystal, the cations and anions are linked through N-H⋯O hydrogen bonds, forming supra-molecular chains propagating(More)
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