Crystal structure, Hirshfeld surface analysis and DFT study of (5,5',6,6')-6,6'-[ethane-1,2-diyl-bis(aza-nylyl-idene)]bis-{5-[2-(4-fluoro-phen-yl)hydra-zono]-3,3-di-methyl-cyclo-hexa-none} 2.5-hydrate.

The title compound, CHFNO·2.5HO, was obtained by condensation of 2-[2-(4-fluoro-phen-yl)hydrazono]-5,5-di-methyl-cyclo-hexan-1,3-dione with ethyl-enedi-amine in ethanol and crystallized as a 1:2.5 hydrate in space group 2/.

Crystal structure of ()-2,6-di--butyl-4-{[2-(2,4-di-nitro-phen-yl)hydrazinylidene]meth-yl}phenol.

The essential part (including all the non-hydrogen atoms except two methyl carbons) of the mol-ecule of the title compound, CHNO, lies on a mirror plane, which bis-ects the -butyl groups. The conformation of the C=N bond of this Schiff base compound is , and there is an intra-molecular N-H⋯O hydrogen bond present, forming an (6) ring motif. In the crystal, mol-ecules are linked O-H⋯O hydrogen bonds, forming zigzag chains propagating along the axis direction.