Synthesis and self-assembly of aroylhydrazone based polycatenars: A structure-property correlation

摘要: Abstract Two series of aroylhydrazone based polycatenars which differ from each other in terms the linking groups (semi flexible ester or ether linkage) were synthesized. These hexacatenars mesogenic and also showed gelation organic solvents at very low concentration, is assisted by intermolecular hydrogen bonding. Both prepared varying peripheral chain length n-hexyloxy to n-hexadecyloxy chain. In case on moving n-decyloxy n-dodecyloxy chain, a transition columnar rectangular phase hexagonal was noticed. Such behavior not seen ether-based hexacatenars, irrespective length. Representative exhibited but critical concentration ester-based hexacatenar almost half that observed for hexacatenar. From these studies we can understand importance group, constitutes small part molecule, has significant effect type self-assembly bulk as well presence solvents. The semi-flexible group provides bent conformation while linear shape evident molecular modeling studies. Further enhances extent bonding with solvent leads lower comparison group. H-bonded liquid crystals have potential preparation crystalline physical gels related applications.