A new triclinic polymorph of 6,6′-{(1 <i>E</i> ,1 <i>E</i> ′)-[(1,2-diphenylethane-1,2-diyl)bis(azaneylylidene)]bis(methaneylylidene)}bis(2-chlorophenol)

The redetermined structure of a new polymorph of 6,6'-{(1<i>E</i>,1<i>E</i>')-[(1,2-di-phenyl-ethane-1,2-di-yl)bis-(aza-neylyl-idene)]bis-(methane-ylyl-idene)}bis-(2-chloro-phenol), C₂₈H₂₂Cl₂N₂O₂ was reported. The title compound was synthesized under microwave irradiation at 90 K, within 10 min. The asymmetric unit comprises a potentially tetra-dentate Schiff base ligand that crystallizes in the triclinic system with space group <i>P</i>1. The structure displays intra-molecular O-H⋯N hydrogen bonding, forming an <i>S</i>(6) ring. Comparisons are made with the monoclinic polymorph [Shen <i>et al.</i> (2017). <i>RSC Adv.</i> <b>7</b>, 40640-40649].