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The molecule of the title compound, C14H9Cl2FN2O, exists in a trans configuration with respect to the methylidene unit and the benzene rings form a dihedral angle of 8.1 (2)°. In the crystal, molecules are linked through N—H...O hydrogen bonds into C(4) chains propagating in [100].

In the title one-dimensional coordination polymer, [ZnCl2(C12H10N4)]n, the ZnII atom (site symmetry 2) is coordinated by two chloride ions and two 1,4-bis(imidazol-1-yl)benzene ligands, generating a distorted tetrahedral ZnCl2N2 geometry for the metal ion. The bridging ligand, which is completed by crystallographic inversion symmetry, links the ZnII atoms into zigzag chains propagating in [101]. Within the ligand, the dihedral angle between the central benzene ring and terminal imidazole ring is 27.82 (13)°.

The title compound, C11H9N3O4S·H2O, contains both an acid and a base centre, and displays a zwitterionic structure in the solid state. The benzene ring makes an angle of 109.1 (2)° with the pyridinium ring. The crystal structure is stabilized by O—H...N, O—H...O and N—H...O hydrogen bonds.