NEW DISC-SHAPED TRIARYLAMINO-1,3,5-TRIAZINES WITH HETEROAROMATIC CENTRAL CORES

New disc-shaped triarylamino-1,3,5-triazines were prepared by reaction of cyanuric chloride with two-fold alkoxy substituted anilines. Each of the triarylmelamines exhibits an enantiotropic mesophase. X-ray inv estigations reveal the formation of columnar liquid crystalline struct ures with either a hexagonal or a rectangular lattice. The lattice par ameters, as well as the intracolumnar ordering, depend on the length o f the flexible lateral side chains. The new melamines form Langmuir mo nolayers at the air/water interface due to their amphiphilic nature. T he monolayer organization is characterized by a side-on arrangement of the molecules. The polar central molecular parts lie flat on the wate r, whereas the lateral alkyl chains are oriented perpendicular to the water surface.