The title compound, C10H13N3O3, adopts an E conformation with respect to the azomethine bond and crystallizes in the amide form. A classical intra-molecular O-H⋯N hydrogen bond is present. The two N atoms of the hydrazinecarboxamide unit are also involved in inter-molecular N-H⋯O hydrogen bonds, with the O atom of the hydrazinecarboxamide group acting as the acceptor. Pairs of N-H⋯O hydrogen bo...

In the title mol-ecule, C21H18O4, the C=C bond of the central enone group adopts a trans conformation. The dihedral angle formed by the naphthalene ring system and the benzene ring is 2.97 (11)°. The hy-droxy group is involved in an intra-molecular O-H⋯O hydrogen bond. In the crystal, weak C-H⋯O hydrogen bonds link the mol-ecules into chains along [001].

The title compound, C(14)H(12)ClN(3)O(2), displays an E conformation with respect to the C=N double bond. The dihedral angle between the benzene rings is 41.3 (5)°. The mol-ecular structure is stabilized by an intra-molecular O-H⋯N hydrogen bond. In the crystal, N-H⋯O and weak N-H⋯Cl hydrogen bonds link the mol-ecules into a three-dimensional architecture. In addition, there are weak C-H⋯π stac...

The title mol-ecule, C(14)H(11)ClN(2)O(2), adopts a trans configuration with respect to the C=N double bond. An intra-molecular N-H⋯O hydrogen bond contributes to mol-ecular conformation and the two benzene rings form a dihedral angle of 17.9 (8)°. In the crystal structure, inter-molecular O-H⋯O hydrogen bonds link the mol-ecules into chains running along [10].

In the mol-ecule of the title compound, C(14)H(18)O(4), the C=C double bond is in an E configuration. The mol-ecule is almost planar (r.m.s. deviation of all non-H atoms = 0.04 Å). An intra-molecular O-H⋯O hydrogen bond occurs. In the crystal, inter-molecular O-H⋯O inter-actions link the mol-ecules into ribbons extending in [110].

In the title compound, C8H9N3O4, there are two mol-ecules in the asymmetric unit, one of which is in the zwitterionic form. The zwitterion contains an intra-molecular N-H⋯O hydrogen bond and the other mol-ecule contains both an intra-molecular N-H⋯O and an intra-molecular O-H⋯O hydrogen bond. In the crystal, N-H⋯O and N-H⋯N hydrogen bonds link the mol-ecules, formimg a two-dimensional network p...

The title potential anti-bacterial compound, C(14)H(12)N(2)O(4)·H(2)O, is a Schiff base which has an intra-molecular O-H⋯N hydrogen bond and crystallizes with one uncoordinated water mol-ecule, which links three symmetry-related mol-ecules through two O-H⋯O and one N-H⋯O hydrogen bond. In the crystal structure, further inter-molecular O-H⋯O hydrogen bonds link symmetry-related mol-ecules, formi...

The title compound, C(14)H(11)FN(2)O(2), adopts an E or trans configuration with respect to the C=N bond. An intra-molecular N-H⋯O hydrogen bond contributes to the relatively planarity of the mol-ecular conformation; the two benzene rings are inclined to one another by 12.5 (2)°. In the crystal structure, inter-molecular O-H⋯O hydrogen bonds link the mol-ecules into chains running parallel to t...

In the title compound, C(12)H(10)N(6)S, a weak intra-molecular C-H⋯S hydrogen bond stabilizes the mol-ecular conformation. The pyrazole and triazole rings form a dihedral angle of 17.82 (8)°. The mol-ecule adopts an E configuration with respect to the central C=N double bond. In the crystal, inter-molecular N-H⋯N and N-H⋯S hydrogen bonds link mol-ecules into chains propagating in [20[Formula: s...

In the title compound, C(11)H(11)N(3)O, the aromatic rings at either ends of the -CH(2)-NH- link are twisted by 72.58 (8)°; the hy-droxy substituent is a hydrogen-bond donor to an N atom of the pyrimidine ring. The other N atom of the pyrimidine ring is a hydrogen-bond acceptor to the amino group of an inversion-related mol-ecule.