Z-azobenzenes compatible with liquid crystals: phase stability and guest-host interaction

Christian Ruslim, Masaru Nakagawa, Shin'ya Morino, Kunihiro Ichimura

Research output: Contribution to journalConference articlepeer-review


Photoresponsive azobenzene/nematic liquid crystal (LC) systems were developed which exhibit no phase separation upon E → Z photoisomerization, even at azobenzene loading as high as 20 wt %. It was shown that Z-3,3′-dialkanoyloxy azobenzene 1a and 1b correlated with the LC host as well as the corresponding E-isomers. The compatibility increased when methyl groups were embedded to the 2 and 2′ position of 3,3′-dialkanoyloxy azobenzene (1b), proving the effectiveness of a steric hindrance to the formation of stable rod-like conformations. After UV exposure, system with 1b exhibited a very sharp TNI at 35.7°C. In contrast, the Z-4,4′-disubstituted analog 2 disorganized the LC orientation because of the bent structure. Experimental results were in agreement with simulation results.

Original languageEnglish
Pages (from-to)316-317
Number of pages2
JournalAmerican Chemical Society, Polymer Preprints, Division of Polymer Chemistry
Issue number2
Publication statusPublished - 1998 Aug
EventProceedings of the 1997 Boston Meeting - Boston, MA, USA
Duration: 1998 Aug 231998 Aug 27


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