Synthesis and characterization of liquid crystalline triaryloxy-s-triazines.

2,4,6-Tris[p-(p’-n-alkylphenyliminomethylene)phenoxy]-s-triazines (3) are calamitic liq. crystals based on x-ray diffraction patterns, optical textures, and mol. modeling results. Replacement of the Schiff’s base moieties in the mesogenic arms to form 2,4,6-tris(p-n-octyloxycarbonylphenoxy)-s-triazine (7) did not result in a liq. cryst. compd. The tricarbonate 2,4,6-tris(p-cholesteryloxycarbonyloxyphenoxy)-s-triazine (11) is liq. cryst. based on the optical textures obsd., although the mesophase type could not be detd. due to the high melting transition and thermal instability of this compd. The use of six ester groups around the triazine nucleus, as 2,4,6-tris(3,5-dicarboalkoxyphenoxy)-s-triazines (13), resulted in compds. which displayed normal melting behavior and no detectable mesomorphism. [on SciFinder(R)]