(E)-N′-[1-(2-Hydroxyphenyl)ethylidene]-2-phenoxyacetohydrazide–2,2′-(1,1′-azinodiethylidyne)diphenol (2/1)

The formula unit of the title molecular complex, 2C16H16N2O3·C16H16N2O2, consists of two (E)-N′-[1-(2-hydroxyphenyl)ethylidene]-2-phenoxyacetohydrazide molecules and one molecule of 2,2′-(1,1′-azinodiethylidyne)diphenol, with the latter located on a crystallographic inversion center. The acetohydrazide molecules are linked into a supermolecular chain along the c axis by intermolecular N—H⋯O hydrogen bonds. There are also intramolecular O—H⋯N hydrogen bonds in both the acetohydrazide and diphenol molecules.


Experimental
The author thanks Changchun Normal University for financial support.
been prepared (Matoga et al., 2007;Tan, 2009). As a contribution to this field, the isolation and the structure of the title 2/1 co-crystal are presented here .

Experimental
A solution of 2,2'-(1,1'-azinodiethylidyne)diphenol (0.2 mmol) in 10 ml of EtOH was added to a solution of (E)-N'-(1-(2hydroxyphenyl)ethylidene) -2-phenoxyacetohydrazide (0.2 mmol) in 10 ml of the same solvent, upon which the solution was refluxed for 1 h. Then the yellow solution was obtained after filtering. Two week later, yellow crystals of the title compound were isolated from the solution.

Refinement
In the title compound, H atoms bonded to C/N atoms were positioned geometrically and refined using a riding and rotating

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 > 2sigma(F 2 ) is used only for calculating R-factors(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.