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In the title compound, C10H10N2O6·H2O, the carboxylic acid group and the nitro group are essentially coplanar with the benzene ring [maximum deviation = 0.0264 (9) Å], while the amide group is oriented at a dihedral angle of 9.22 (5)° with respect to the benzene ring. In the crystal, classical O—H...O and N—H...O hydrogen bonds and weak C—H...O interactions link the organic molecules and water molecules of crystallization into a three-dimensional supramolecular architecture.

The title compound, C10H8I3NO4, crystallizes with two molecules in the asymmetric unit. The I atoms and the benzene ring plane in the two molecules are approximately coplanar, the I atoms deviating by −0.1631 (1), 0.0704 (1) and −0.0507 (1) Å from the mean plane of the benzene ring in one molecule and by 0.1500 (1), −0.0034 (1) and −0.1213 (1) Å in the other. The planes of the ester groups are almost orthogonal to those of the benzene rings in both molecules, forming dihedral angles of 83.5 (3), 76.4 (3), 97.3 (1) and 75.7 (1)°. The mean planes of the benzene rings in two molecules are inclined at 69.8 (3)° with respect to each other. In the crystal, intermolecular I...O interactions link the molecules into infinite chains. In addition, N—H...O and non-classical C—H...O hydrogen bonds are observed.

The carbonyl chloride group in the title compound, C7H3ClN2O5, is disordered over two orientations with occupancies of 0.505 (5) and 0.495 (5). The molecule is approximately planar, the dihedral angle between the carbonyl chloride plane and benzene ring being 9.6 (4)° in the major disorder component and 7.1 (4)° in the minor component. The nitro group at the 5-position is twisted, forming a dihedral angle of 6.7 (4)°. The crystal packing is stabilized by C—H...O hydrogen bonds.

In the title compound, C10H9NO6, the carboxy, ethoxycarbonyl and nitro groups form dihedral angles of 3.8 (1), 4.5 (1) and 164.8 (1)°, respectively, with the mean plane of the benzene ring. In the crystal structure, molecules lying about inversion centers are linked through O—H...O hydrogen bonds. C—H...O interactions are also present.

In the title compound, C8H13N2O2+·Cl−·H2O, the methyl C atom of the ethyl group is slightly out of the imidazole plane, with an N—C(ring)—C—C torsion angle of −15.1 (2)°. In the crystal structure, there are strong intermolecular hydrogen-bonding interactions between the solvent water molecule, the free chloride anion and the organic cation, resulting in a two-dimensional supramolecular network in the ab plane.

In the structure of the title compound, C11H12N2O6, the molecules are stacked along the b axis without any π–π interactions. The stacked columns are linked together by non-classical intermolecular C—H...O interactions,. In the molecule, the nitro groups make dihedral angles of 9.4 (5) and 10.3 (5)° with the benzene ring.

In the title compound, C12H15NO3, the ethoxybenzyl ring plane forms a dihedral angle of 60.3 (4)° with the mean plane of the oxazolidine ring. The molecules are linked through N—H...O hydrogen bonds into a chain running in the b direction.

In the title compound, C11H15NO3, the mean planes of the carboxamide and isopropyl groups are inclined at 109.9 (1) and 128.7 (2)°, respectively, to the mean plane of the phenoxy group. In the crystal structure, molecules are stacked along the b axis, without any π–π interactions. The stacked columns are linked together by intermolecular N—H...O hydrogen bonds, with an N...O distance of 2.842 (2) Å.

The structure of the title compound, C9H7NO6, is essentially planar [maximum deviation 0.284 (2)Å] except for the methyl H atoms. The crystal structure is stabilized by asymmetric O—H...O hydrogen bonds linking the hydrogen carboxylates into pairs around the inversion centres. There is also π–π stacking of the benzene rings [centroid–centroid distance 3.6912 (12) Å].

In the title compound, C11H14N2O5, the nitro group is approximately coplanar with the benzene ring, making a dihedral angle of 4.26 (17)°. The dihedral angle between the methylcarbamate group and the benzene ring is 72.47 (6)°. There is a strong intermolecular N—H...O hydrogen bond between the N and O atoms from adjacent methylcarbamate groups, forming a one-dimensional network along the a axis.

In the molecule of the title compound, C10H9NO6, the two ester groups and the nitro group are inclined at 9.2 (2), 123.3 (6) and 135.2 (5)°, respectively to the mean plane of the benzene ring. In the crystal structure, molecules are stacked along the a axis, without any π–π interactions. The stacked columns are linked together by non-classical intermolecular interactions of the type C—H...O

C11H8FNO4, monoclinic, P21/n (no. 14), a = 9.177(3) Å, b = 5.472(2) Å, c = 22.414(7) Å, β = 95.264(4)°, V = 1120.7 Å3, Z = 4, Rgt(F) = 0.0493, wRref(F2) = 0.1195, T = 203 K.