X-Ray Studies in the n-Pentyl 4-[4-n-Dodecyl-Oxybenzylidene-Amino]-Cinnamate in the S_I Phase

Abstract

Results of X-ray studies in oriented and not oriented samples of n-pentyl 4-[4-n-dodecyloxybenzylidene-amino] -cinnamate in the smectic modifications I, C and A respectively are reported. Special emphasis is led to the S_I phase, the structure of which is determined to be monoclinic with parameters a=5.04Å; b=8.40 Å c=37.8 Å; ß= 106°. An attempt was made to present a model of the packing of the molecules regarding shifts of the molecules, too.