Bis[4-hydroxy-3,5-dimethoxybenzaldehyde (2,4-dinitrophenyl)hydrazone] N,N-dimethylformamide disolvate monohydrate

In the title compound, 2C15H14N4O7·2C3H7NO·H2O, the hydrazone molecules are roughly planar, with the two benzene rings twisted slightly relative to each other by dihedral angle of 6.04 (11) and 7.75 (11)° in the two molecules. The water molecule is linked to the Schiff base molecule by an O—H⋯O hydrogen bond. Intramolecular N—H⋯O hydrogen bonds occur. In the crystal, molecules are linked by intermolecular N—H⋯O and O—H⋯O hydrogen bonds.

In the title compound, 2C 15 H 14 N 4 O 7 Á2C 3 H 7 NOÁH 2 O, the hydrazone molecules are roughly planar, with the two benzene rings twisted slightly relative to each other by dihedral angle of 6.04 (11) and 7.75 (11) in the two molecules. The water molecule is linked to the Schiff base molecule by an O-HÁ Á ÁO hydrogen bond. Intramolecular N-HÁ Á ÁO hydrogen bonds occur. In the crystal, molecules are linked by intermolecular N-HÁ Á ÁO and O-HÁ Á ÁO hydrogen bonds.

Refinement
All H atoms attached to C, N and O(hydroxyl) atoms were fixed geometrically and treatedas riding with C-H = 0.96 Å (methyl) or 0.93 Å (aromatic) and N-H =0.86 Å with U iso (H) = 1.2U eq (Caromatic or N) or U iso (H) = 1.5U eq (Cmethyl, O). H atoms of water molecule were located in difference Fourier maps and included in the subsequent refinement using restraints (O-H= 0.85 (1)Å and H···H= 1.39 (2)Å) with U iso (H) = 1.5U eq (O). In the last cycles of refinement, they were treated as riding on their parent O atom.
supplementary materials sup-2 Figures Fig. 1. The asymmetric unit of (I) with the atom-labelling scheme. Displacement ellipsoids are drawn at the 30% probability level. H atoms are represented as small spheres of arbitrary radii. Hydrogen bonds are shown as dashed lines.

Special details
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.
Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > σ(F 2 ) is used only for calculating Rfactors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.