X-ray diffraction analysis of 4- and 4′-substituted CnH2n + 1O–C6H3(OH)–CH=N–C6H4–CmH2m + 1 (n/m = 2/1 and 3/4) salicylideneanilines

Abstract

X-ray diffraction study of two crystalline modifications of С₂Н₅O–C₆H₃(OН)–СН=N–C₆H₄–CH₃ (1a, sp. gr. Р2₁/n, and 1b, sp. gr. С2/c) and С₃H₇O–C₆H₃(OН)–СН=N–C₆H₄–C₄H₉ (2, sp. gr. Р2₁2₁2₁) has been performed. The 1a crystal structure contains two independent molecules. The molecules are conformationally nonrigid with respect to the mutual rotation of benzene rings; the dihedral angles between their planes are 29.19° and 26.00° in the independent molecules of 1a, 18.72° in the molecule of 1b, and 50.35° in the molecule of 2. The crystal packing of the compounds is discussed.