Synthesis and study of 4‐(4′‐n‐alkoxybenzoyloxybenzoyl)‐4′′‐n‐butoxyanilides

Understanding the remarkable difference in liquid crystal behaviour between secondary and tertiary amides: the synthesis and characterisation of new benzanilide-based liquid crystal dimers

“…It was found, however, that 2° amides could form liquid crystal phases, although these materials showed high melting points which were attributed to the presence of strong hydrogen bonding. 3 Careful molecular design using a selection of suitable lateral substituents and terminal groups attached to the mesogenic units allowed the melting point to be manipulated and a range of calamitic [4][5][6][7][8][9][10][11][12][13] and bent-core [14][15][16][17][18] liquid crystalline materials based around secondary amide groups have been reported. These systems tend to predominantly form smectic phases, again attributed to intermolecular hydrogen bonding between the amide groups.…”

The Influence of Oxygen on Mesomorphic Behavior of Benzylidene Anilines—The Effect of End Chain

“…The Schiff's base compounds are trans and acoplanar. The existence of mesomorphic properties in these compounds is due to a twist in the aniline ring out of CÀN=CÀC plane and the calculations have indicated this twist to be as much as 55 degrees [6,7]. When two aromatic nuclei are not coplanar, it is possible for the terminal of one molecule to interact strongly with one of the rings of another molecule, causing additional attractions and a more thermally stable mesophase as the terminus grows in length [8].…”