THE CRYSTAL AND MOLECULAR-STRUCTURE OF 3 HOMOLOG 1,4-DIALKANOYLOXY-BIPHENYLS (SYM-N)

The three homologue compounds with the general formula CnH2n+1-COO-C6H 4-C6H4-OOC-CnH2n+1 (SYM-n) crystallize in the following space groups: SYM-1: triclinic, P1BAR, a = 7.400(6), b = 9.227(3), c = 10.579(3) ang strom, alpha = 85.97(3), beta = 89.09(3), gamma = 71.47(3)-degrees; SY M-2: monoclinic, P2(1)/c, a = 11.712(7), b = 5.648(1), c = 12.408(6) a ngstrom, beta = 103.84(3)-degrees; SYM-5: triclinic, P1BAR, a = 5.505( 4), b = 8.342(8), c = 24.79(2) angstrom, alpha = 86.67(3), beta = 85.4 5(6), gamma = 71.74(7)-degrees. The structures have been solved by dir ect methods and refined to R = 0.075, 0.061 and 0.053, respectively. T he packing arrangements show a layer-like structure. The layers are al most separated for SYM-1 as well as for SYM-2 and interdigitated for t he structure of SYM-5.