Synthesis, crystal structure and thermal properties of <i>N</i> ′-[( <i>E</i> )-3,5-di- <i>tert</i> -butyl-2-hydroxybenzylidene]-2-hydroxybenzohydrazide ethanol quatersolvate

In the structure of the title compound, 4C₂₂H₂₈N₂O₃·C₂H₆O, mol-ecules composed of an acyl-hydrazone segment bridging a 3,5-di-<i>tert</i>-butyl-phenol unit and a 2-hy-droxy-phenol unit form columnar quartet channels along the <i>a</i>-axis, within which disordered ethanol solvent mol-ecules reside in two inversion-centre-related positions. Inter-molecular hydrogen bonds assemble the channels between the columnar mol-ecules through the hosted ethanol mol-ecule, complemented by weaker van der Waals-type inter-actions. These weak van der Waals inter-actions also hold the columns together. Additionally, the title compound demonstrated notable thermal stability at temperatures of up to 251°C. The sharp melting point peak observed in the DSC confirmed its crystalline structure.