catena-Poly[[(dichloridozinc)-μ-4,4′-bis­(1H-imidazol-1-yl)biphenyl-κ²N³:N^3′] 0.25-hydrate]

In the title one-dimensional coordination polymer, {[ZnCl₂(C₁₈H₁₄N₄)]·0.25H₂O}_n, the Zn^II atom is coordinated by two chloride ions and two 4,4′-bis­(1H-imidazol-1-yl)biphenyl ligands, generating a distorted tetra­hedral ZnCl₂N₂ geometry. The dihedral angle between the benzene rings of the ligand is 51.0 (1)° and the dihedral angles between the benzene rings and their attached imidazole rings are 18.7 (2) and 45.9 (1)°. The bridging ligand leads to [10-1] polymeric chains in the crystal and the disordered water mol­ecule (occupancy 0.25) forms O—H...Cl hydrogen bonds.

4-Dimethyl­amino-N′-(4-nitro­benzyl­idene)benzohydrazide methanol monosolvate

In the title compound, C₁₆H₁₆N₄O₃·CH₃OH, the aromatic rings form a dihedral angle of 0.4 (2)°. The nitro group is twisted from the attached benzene ring by 7.5 (2)°. In the crystal, N—H...O and O—H...O hydrogen bonds link alternating hydrazone and methanol mol­ecules into chains in [100]. The crystal packing exhibits π–π inter­actions between aromatic rings from neighbouring chains [centroid–centroid distances = 3.734 (3) and 3.903 (3) Å].