2,2′-[(Propane-1,3-diyldinitrilo)bis(phenylmethylidyne)]diphenol

In the title molecule, C29H26N2O2, there are two strong intramolecular O—H⋯N hydrogen bonds involving the hydroxy and imine groups, forming S(6) ring motifs. The dihedral angles between adjacent phenyl rings and phenol-containing planes are 85.27 (19) and 91.38 (18)°. In the crystal structure, weak intermolecular C—H⋯O hydrogen bonds connect molecules into a two-dimensional network.

In the title molecule, C 29 H 26 N 2 O 2 , there are two strong intramolecular O-HÁ Á ÁN hydrogen bonds involving the hydroxy and imine groups, forming S(6) ring motifs. The dihedral angles between adjacent phenyl rings and phenolcontaining planes are 85.27 (19) and 91.38 (18) . In the crystal structure, weak intermolecular C-HÁ Á ÁO hydrogen bonds connect molecules into a two-dimensional network.
After cooling to 277 K a yellow solid was produced. The polycrystalline product was collected by filtration, washed with methanol and dried. A yield of 52% was obtained. Recrystalization from an ethanol solution yielded single crystals suitable for x-ray diffraction. Elemental analysis C% 79.67 H% 6.26 N% 6.11%.

Refinement
All H atoms were refined using a riding model, with C-H = 0.93-0.97 Å, O-H = 0.82 Å, and Uiso(H) = 1.2Ueq(C) or 1.5Ueq(O). Fig. 1. The molecular structure of the title compound with displacement ellipsoids drawn at the 30% probability level. 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.
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å 2 )