Mesophase-Preceding Crystal Packing of 4,4'-Dialkyl-Substituted Salicylideneanilines; C10H21O–C6H3(OH)–CH=N–C6H4–С7Н13) Structure

Abstract

The crystal structure of 4,4'-substituted salicylideneaniline C₁₀H₂₁O–C₆H₃(OH)–CH=N–C₆H₄–C₇H₁₃ has been investigated by X-ray diffraction. A high degree of disorder of both alkyl chains is revealed. The crystal packing consists of alternating loose aliphatic and closely packed aromatic regions. Weak directional interactions of the С–Н···π type are found in aromatic regions. Specific features of the mesogenic compound crystal packing preceding the mesophase, melting of these compounds, and the formation of mesophase upon isotropic melt cooling are discussed based on the X-ray diffraction and differential scanning calorimetry data.