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

In the structure of the title compound, 4C 22 H 28 N 2 O 3 ·C 2 H 6 O, molecules composed of an acylhydrazone segment bridging a 3,5-di- tert -butylphenol unit and a 2-hydroxyphenol unit form columnar quartet channels along the a -axis, within which disordered ethanol solvent molecules reside in two inversion-centre-related positions. Intermolecular hydrogen bonds assemble the channels between the columnar molecules through the hosted ethanol molecule, complemented by weaker van der Waals-type interactions. These weak van der Waals interactions 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.