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In the title complex, [HgI2(C21H19N5)2], the HgII ion is located on a twofold rotation axis and is coordinated by two I atoms and two N atoms from two (E)-2-{5,5-dimethyl-3-[4-(1H-1,2,4-triazol-1-yl)styryl]cyclohex-2-enylidene}malononitrile ligands in a distorted tetrahedral geometry. In the crystal, the molecules are linked by intermolecular π–π interactions between the triazole and benzene rings [centroid–centroid distance = 3.794 (3) Å] into a band extending in [010]. These bands are further connected by C—H...N hydrogen bonds into a two-dimensional network parallel to (100).

The asymmetric unit of the title compound, C12H12N2O3, contains two molecules in which the benzene and isoxazole rings are almost coplanar, the dihedral angles between their mean planes being 1.76 (9) and 5.85 (8)°. The two molecules interact with each otherviaN—H...N and N—H...O hydrogen bonds, which link the molecules into layers parallel to theacplane. The layers stack in a parallel mode with an interlayer distance of 3.36 (7) Å.

In the title compound, C13H15N3O3, the dihedral angle between the benzene and pyrazole rings is 7.7 (1)° and the O—C—C—N torsion angle of the side chain is 74.1 (2)°. In the crystal, molecules are linked by O—H...O, N—H...O and N—H...N hydrogen bonds.