Abstract
Organophosphazenes with a similar mesogenic moiety were prepared and their mesogenicity was studied by differential scanning calorinetry (DSC) measurements and polarizing microsope observations. In cyclotriphosphazenes with alk- oxybiphenyl and Schiff base moieties, meso- morphic phase transitions were observed, but no mesomorphic phase was observed for the corre- sponding cyclotetraphosphazenes. In polyphos- phazenes with an alkoxybiphenyl moiety, no mesomorphic phase was observed. The molecu- lar structure of cyclotriphosphazenes facilitated the formation of a mesomorphic layer structure; in contrast, the formation of a mesomorphic layer structure did not occur in cyclotetrapho- sphazenes and polyphosphazenes, even though they bore a similar mesogenic moiety. Moreover, in cyclotriphosphazenes with an optically active alkoxybiphenyl group, a smectic C * phase was observed. The spontaneous polarization of the compound wasˇ190 m Cm ˇ 2 at 436 K in 25 m in
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