Crystal structure, Hirshfeld surface analysis and DFT study of (5E,5′E,6Z,6′Z)-6,6′-[ethane-1,2-diylbis(azanylylidene)]bis{5-[2-(4-fluorophenyl)hydrazono]-3,3-dimethylcyclohexanone} 2.5-hydrate

Abstract

The title compound, C30H34F2N6O2·2.5H2O, was obtained by condensation of 2-[2-(4-fluorophenyl)hydrazono]-5,5-dimethylcyclohexan-1,3-dione with ethylenediamine in ethanol and crystallized as a 1:2.5 hydrate in space group C2/c. The two independent molecules, with approximate crystallographic C 2 symmetries, have different conformations and packing environments, are stabilized by intramolecular N—H...N hydrogen bonds and linked by O—H...O hydrogen bonds involving the water molecules. A Hirshfeld surface analysis showed that H...H contacts make by far the largest (48–50%) contribution to the crystal packing. From DFT calculations, the LUMO–HOMO energy gap of the molecule is 0.827 eV.