N,N'-Bis(2-hydroxy­benzyl­idene)pentane-1,5-diamine

In the title potential O,N,N',O'-tetra­dentate Schiff base ligand {systematic name: 2,2'-[pentane-1,5-diylbis(nitrilo­methyl­idyne)]diphenol}, C₁₉H₂₂N₂O₂, the mutual orientation of the three planar fragments determines the conformation of the mol­ecule. The dihedral angles between the planes of the two salicyl­idene groups and the plane of the central extended pentane chain are 78.4 (2) and 62.0 (3)°, and the angle between the terminal ring planes is 55.4 (1)°. Strong intra­molecular O-H...N hydrogen bonds close almost-planar six-membered rings, and the O-H bonds are elongated as a result of hydrogen-bond formation.