チオエーテルで連結したアゾベンゼン系二量体の合成とツイストベンドネマチック相

抄録

We synthesized symmetric azobenzene-based dimers (CN)AzoSnSAzo(CN) (n = 3, 5, 7, 9 and 11) and asymmetric (CN)AzoSnSCB (n = 3, 5, 7, 9 and 11), and evaluated their phase-transition behavior using polarized light optical microscopy and differential scanning calorimetry. Symmetric (CN)AzoSnSAzo(CN) dimers exhibited higher phase-transition temperature than those of asymmetric (CN)AzoSnSCB dimers for corresponding n. Asymmetric (CN)AzoSnSCB (n = 7 and 9) exhibited the twist-bend nematic (NTB) phase across a wide temperature range. The NTB phases were supercooled to room temperature to be vitrified.