(3Z,3′E)-3,3′-[Cyclohexane-1,2-diylbis(azanylylidene)]bis(indolin-2-one) N,N-dimethylformamide monosolvate dihydrate

In the Schiff base molecule of the title compound, C22H20N4O2·C3H7NO·2H2O, the cyclohexane ring adopts a chair conformation with the two imine groups linked at the equatorial positions. The two indolin-2-one ring systems make a dihedral angle of 65.63 (5)°. In the crystal, the Schiff base molecules are connected through bifurcated N—H...(O,N) hydrogen bonds, forming inversion dimers. The water molecules link the dimers and the dimethylformamide molecules via O—H...O, O—H...N and N—H...O hydrogen bonds. Together with C—H...π and π–π [centroid–centroid distance = 3.3889 (10) Å] interactions a three-dimensional supramolecular structure is formed.

Abstract licence: CC BY

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