アルコキシアゾベンゼンートリフェニレンエステル結合体における異方的分子間相互作用のバランスシフトにより誘起されるカラミチックSm相-ディスコチックCol相双液晶性相転移

抄録

A triphenylene derivative possessing six 4-tetradecyloxyazobenzene units connected via propylene-ester linkages shows both calamitic and discotic bimesomorphic properties. To clarify the Sm-Col phase transition mechanism, the phase transitions of alkyl homologues are discussed on the anisotropic XRD results obtained by synchrotron radiation XRD at SPring-8. A diffraction corresponding to the stacking periodicity of triphenylene rings was slightly observed in the Sm phase, depending on the chain lengtgh and its intensity is enhanced at the Sm→Col phase transition. These results strongly indicate that the anisotropic intermolecular interaction among triphenylene units is essential for the Sm-Col phase transition against another anisotropic interactions among the rod-like azobenzene units.