X-ray diffraction analysis of 4- and 4′-substituted C_nH_2n+1O–C₆H₃(OH)–CH=N–C₆H₄–C_mH_2m+1 (n/m = 2/1 and 3/4) salicylideneanilines

X-ray diffraction study of two crystalline modifications of С₂Н₅O–C₆H₃(OН)–СН=N–C₆H₄–CH₃ (1a, sp. gr. #0420#2₁/n, and 1b, sp. gr. #0421#2/c) and С₃H₇O–C₆H₃(OН)–СН=N–C₆H₄–C₄H₉ (2, sp. gr. #0420#2₁2₁2₁) 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.