THE CRYSTAL AND MOLECULAR-STRUCTURE OF 3 HOMOLOG 1,4-TEREPHTHALYLIDENE-BIS-N-(4'-ALKYLANILINES) (TBAA-N)

The three homologue compounds with the general formula CnH2n+1-C6H4-N= (CH)-C6H4-(CH)=N-C6H4-CnH2n+1 (TBAA-n) crystallize in the following sp ace groups: TBAA-0: monoclinic, P 2(1)/c, a = 7.656(3). b = 6.073(1), 16.403(7) angstrom, beta = 91.60(2)-degrees; TBAA-1: monoclinic, P 2(1 )/n, a = 6.0426(11). b = 7.84171(4), c = 18.2147(31) angstrom, beta = 92.32(1) TBAA-2: orthorhombic, P bcn, a = 20,9390(8). h = 14.8876(7), c = 6.2069(1)angstrom. The structures have been solved by direct metho ds and refined to R = 0.029, 0.044, and 0.049, respectively. Despite t he different conformation of the terminal phenyl rings relative to the central core of the coplanar azomethine groups and the phenyl ring, t he molecular packing of the three compounds obeys the same principles in forming the crystal structure.