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The title compound, C9H10N2O3·2H2O, crystallizes with two organic molecules and four water molecules in the asymmetric unit. Both organic molecules adopt a trans conformation with respect to the C=N bond and are close to planar [dihedral angles between the side chain and the aromatic ring = 9.34 (8) and 4.96 (8)°]. In the crystal, the components are linked into three-dimensional network by N—H...O and O—H...O hydrogen bonds.

The title molecule, C12H16N2O5, adopts a trans configuration with respect to the C=N bond. In the crystal, intermolecular N—H...O hydrogen bonds link the molecules into chains in [001], and weak intermolecular C—H...O interactions further link the chains into corrugated layers parallel to the bc plane.

The asymmetric unit of the title compound, C10H12N2O3·2H2O, contains two organic molecules with similar conformations and four water molecules. Each organic molecule is close to planar (r.m.s. deviations = 0.035 and 0.108 Å) and adopts a trans conformation with respect to its C=N bond. In the crystal, the components are linked into a three-dimensional network by N—H...O, O—H...O, O—H...N and C—H...O hydrogen bonds, some of which are bifurcated. An R22(8) loop occurs between adjacent organic molecules.

The asymmetric unit of the title compound, C11H11N3O2·0.25H2O, contains two independent organic molecules and a water molecule, which lies on a twofold rotation axis. The side chains of the two molecules have slightly different orientations, the C=N—N—C torsion angle being −163.03 (15)° in one and −177.52 (14)° in the other, with each adopting a trans configuration with respect to the C=N bond. In the crystal, molecules are linked into chains extending along b by N—H...O, O—H...N and O—H...O hydrogen bonds and in addition, four intermolecular C—H...π interactions are present.

In the title compound, C10H12N2O3·H2O, the Schiff base molecule is approximately planar [within 0.189 (1) Å]. The interplanar angle between the benzene and acetohydrazide planes is 8.50 (10)°. In the crystal, molecules are linked into a three-dimensional network by strong and weak O—H...O and strong N—H...O hydrogen bonds. The hydroxy H atom deviates from the 4-hydroxy-3-methoxyphenyl mean plane by 0.319 (2) Å, probably due to the involvement of this H atom in the O—H...O hydrogen bond. The weak O—H...O hydrogen bond is involved in a bifurcated hydrogen bond with R12(4) motif. A weak C—H...π interaction is also present.

The title compound, C11H15N3O, crystallizes with two independent molecules per asymmetric unit which differ slightly in their side-chain orientations: the C=N—N—C torsion angle is −176.2 (3)° in one of the molecules and −179.83 (3)° in the other. Each independent molecule adopts a trans configuration with respect to the C=N bond. The two independent molecules are related by a pseudo-inversion center and they exist as a N—H...O hydrogen-bonded dimer. The dimers are linked into zigzag chains along [100] by C—H...O hydrogen bonds.

The title compound, C10H12N2O3, crystallizes with two independent molecules in the asymmetric unit which differ in the orientation of the methoxy group. Each independent molecule adopts a trans configuration with respect to the C=N bond. In the crystal structure, molecules are linked into chains running along [001] by N—H...O and N—H...N hydrogen bonds. In addition, an intermolecular C—H...π interaction is observed.

In the title compound, C9H10N2O3, the Schiff base molecule is approximately planar, the dihedral angle between the benzene ring and the acetohydrazide group (r.m.s. deviation = 0.034 Å) being 8.81 (7)°. An intramolecular O—H...O hydrogen bond is observed. In the crystal, molecules are linked into a three-dimensional network by O—H...O, N—H...O and C—H...O hydrogen bonds.

In the title molecule, C7H8N2O2, the acetohydrazide group is planar within 0.014 (2) Å and forms a dihedral angle of 5.35 (8)° with the furan ring. The molecule adopts a trans configuration with respect to the C=N bond. In the crystal, molecules are linked into a chain along the a axis by N—H...O hydrogen bonds.

In the title molecule, C10H12N2O2, the acetohydrazide group is planar within 0.012 (1) Å and forms a dihedral angle of 5.25 (8)° with the benzene ring. The methoxy group is coplanar with the attached benzene ring [C—O—C—C = 0.1 (2)°]. The molecule adopts a trans configuration with respect to the C=N double bond. In the crystal, molecules are linked into centrosymmetric dimers by N—H...O hydrogen bonds and these dimers are linked into a ribbon-like structure along [110] by C—H...O hydrogen bonds. In addition, an intermolecular C—H...π interaction is observed.

In the title compound, C9H10N2O2·H2O, the molecular skeleton of the acetohydrazide molecule is nearly planar [within 0.014 (1) Å]. The molecule adopts a trans configuration with respect to the C=N bond, while the side chain is slightly twisted away from the attached ring, forming a dihedral angle of 9.975 (8)°. The crystal packing exhibits a three-dimensional network composed from alternating acetohydrazide molecules and uncoordinated water molecules, which interact via N—H...O, O—H...O and O—H...N hydrogen bonds. A C—H...π interaction is also present.

In the title molecule, C11H14N2O3, the acetohydrazide group is planar 0.084 (1) Å and forms a dihedral angle of 19.7 (1)° with the benzene ring. One of the methoxy groups is coplanar with the attached benzene ring within 0.052 (3) Å, whereas the other is slightly twisted [C—O—C—C = 6.3 (3)°]. The molecule adopts a trans configuration with respect to the C=N bond. In the crystal, the molecules are linked into chains along the a axis by N—H...O hydrogen bonds and the chains are cross-linked into a three-dimensional network by C—H...O hydrogen bonds.

In the title compound, C9H10N2O3·H2O, the Schiff base molecule is approximately planar, the dihedral angle between the benzene and acetohydrazide planes being 5.40 (7)°. An intramolecular O—H...O hydrogen bond is observed. In the crystal, molecules are linked into a two-dimensional network parallel to (100) by O—H...O, N—H...O, O—H...N and C—H...O hydrogen bonds, and by π–π interactions between symmetry-related benzene rings [centroid–centroid distance = 3.543 (2) Å].

The asymmetric unit of the title compound, C11H14N2O3, contains two independent molecules with close conformations; the C=N—N—C torsion angle is 176.4 (1)° in both molecules. In the crystal, intermolecular N—H...O and C—H...O hydrogen bonds link the molecules into chains running along the [01overline{1}] direction.

The molecule of the title compound, C10H12N2O4, adopts a trans configuration with respect to the C=N bond. The dihedral angle between the benzene ring and the methyl hydrazinecarboxylate plane is 3.01 (6)°. An intramolecular O—H...N hydrogen bond is observed. In the crystal, molecules are linked into a two-dimensional network parallel to (10overline{1}) by O—H...O, N—H...O and C—H...O hydrogen bonds.

The title compound, C10H12N2O4, adopts a trans configuration with respect to the C=N double bond. The non-H atoms of the molecule are essentially coplanar, with a maximum deviation of 0.015 (2) Å. An intramolecular O—H...N interaction is observed. In the crystal structure, the molecules are linked into a two-dimensional network parallel to the ac plane by N—H...O hydrogen bonds involving the methoxy O atom and by two C—H...O hydrogen bonds involving the carbonyl O atom. In addition, an intermolecular C—H...π interaction is observed.

In the title compound, C8H10N2O3, the hydrazinecarboxylate group is twisted from the furan ring by 6.98 (17)°. In the crystal, the molecules are linked into one-dimensional chains running along the c axis by N—H...O hydrogen bonds.

The title compound, C10H12N2O4, adopts a trans configuration with respect to the C=N bond. The hydrazinecarboxylate group is twisted from the benzene ring by 6.62 (5)° and an intramolecular O—H...O hydrogen bond occurs. In the crystal structure, molecules are linked into a two-dimensional network parallel to (100) by O—H...O, N—H...O and C—H...O hydrogen bonds. In addition, weak C—H...π interactions are observed.

The title compound, C10H12N2O3, crystallizes with two independent molecules in the asymmetric unit. The side chains in the two independent molecules have slightly different orientations, with the C=N—N—C torsion angle being 169.19 (14)° in one of the molecules and −179.86 (14)° in the other. Each independent molecule adopts a trans configuration with respect to the C=N bond. In the crystal structure, molecules are linked into chains running along [001] by N—H...O, N—H...N and C—H...O hydrogen bonds. In addition, an intermolecular C—H...π interaction is observed.

The molecule of the title compound, C12H16N2O5, adopts a trans configuration with respect to the C=N double bond. The dihedral angle between the benzene and hydrazinecarboxylic acid methyl ester planes is 12.55 (7)°. The molecules are linked into a chain along [001] by intermolecular N—H...O hydrogen bonds, and the chains are cross-linked into a two-dimensional zigzag structure by C—H...O hydrogen bonds.

The molecule of the title compound, C13H18N2O5, adopts a trans configuration with respect to the C=N bond. The dihedral angle between the benzene ring and the hydrazinecarboxylic acid plane is 49.75 (5)° and an intramolecular C—H...O interaction occurs. In the crystal structure, the molecules are linked into a chain along [010] by N—H...O hydrogen bonds, and a C—H...π contact further stabilizes the structure.

The title compound, C11H14N2O4, crystallizes with two independent but essentially identical molecules in the asymmetric unit. Each molecule adopts a trans configuration with respect to the C=N bond. Molecules are linked into a one-dimensional network by inter- and intramolecular N—H...O and C—H...O hydrogen bonds.

In the title compound, C2H7N2O2+·Cl−·H2O, the non-H atoms of the cation are approximately coplanar. The organic cations, chloride ions and water molecules are linked into a two-dimensional network parallel to the bc plane by N—H...O, N—H...Cl and O—H...Cl hydrogen bonds.

The molecule of the title compound, C12H16N2O3, adopts a trans configuration with respect to the C=N bond. The dihedral angle between the benzene ring and the hydrazinecarboxylate plane is 13.82 (6)°. In the crystal structure, molecules are linked into centrosymmetric dimers by N—H...O and C—H...O hydrogen bonds, and the dimers are linked together by C—H...π interactions.

The title compound, C7H8N2O3, crystallizes with two independent but essentially identical molecules in the asymmetric unit. Each molecule adopts a trans configuration with respect to the C=N bond. The hydrazinecarboxylate group is twisted from the furan ring by 7.78 (13)° in one molecule and by 7.01 (17)° in the other. In the crystal structure, molecules are linked into chains running along [010] by bifurcated N—H...(N,O) and N—H...O hydrogen bonds. In addition, weak C—H...O interactions and an O...C short contact [2.896 (3) Å] are observed.

The title molecule, C11H14N2O2, adopts a trans configuration with respect to the C=N bond. The dihedral angle between the benzene ring and the hydrazinecarboxylate plane is 7.61 (16)°. In the crystal structure, molecules are linked into centrosymmetric dimers by N—H...O hydrogen bonds and the dimers are linked together by C—H...π interactions.

In the title compound, C12H16N2O4·H2O, the molecular skeleton of the hydrazinecarboxylate is nearly planar [within 0.053 (3) Å]. In the crystal, chains propagating along the c axis arise, composed of alternating hydrazinecarboxylate molecules and crystalline water, which interact via N—H...O and O—H...O hydrogen bonds.

The title compound, C10H12N2O3, adopts a trans configuration with respect to the C=N bond. The dihedral angle between the benzene ring and the hydrazine carboxylic acid plane is 8.29 (7)°. Molecules are linked into a three-dimensional network by N—H...O, O—H...O, O—H...N hydrogen bonds and C—H...π interactions.

The molecule of the title compound, C11H14N2O3, adopts a trans configuration with respect to the C=N bond. The dihedral angle between the benzene ring and the hydrazinecarboxylate plane is 12.06 (9)°. Molecules are linked into a one-dimensional network by N—H...O hydrogen bonds and C—H...π interactions. The benzene rings of inversion-related molecules are stacked with their centroids separated by 3.777 (1) Å, indicating π–π interactions.

The title compound, (C4H7N4O)2[Bi2Cl9(C4H7N4O)]·H2O, was prepared by the reaction of bismuth trichloride and 5-amino-1H-imidazole-4-carboxamide in a dilute HCl medium. The asymmetric unit contains two 5-amino-4-aminocarbonyl-1H-imidazol-3-ium cations, one edge-shared non-centrosymmetric bioctahedral [Bi2C19(C4H7N4O)]2− dianion and a water molecule. In the dianion, the planar 5-amino-4-aminocarbonyl-1H-imidazol-3-ium ligand occupies an equatorial site and is inclined at an angle of 75.7 (2)° to the Bi2(μ-C1)2 plane. The salt forms a three-dimensional network arising from hydrogen bonds between cations, anions and water molecules.