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Liquid‐crystalline phase transition in organophosphazenes
Author(s) -
Moriya Keiichi,
Suzuki Toshiya,
Kawanishi Yasuyuki,
Masuda Tsuyoshi,
Mizusaki Hiroshi,
Nakagawa Shigekazu,
Ikematsu Hiroshi,
Mizuno Katsuyuki,
Yano Shinichi,
Kajiwara Meisetsu
Publication year - 1998
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/(sici)1099-0739(199810/11)12:10/11<771::aid-aoc785>3.0.co;2-e
Subject(s) - moiety , mesogen , chemistry , phase (matter) , crystallography , phase transition , liquid crystal , polymer chemistry , stereochemistry , organic chemistry , liquid crystalline , materials science , optoelectronics , quantum mechanics , physics
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, mesomorphic phase transitions were observed, but no mesomorphic phase was observed for the corresponding cyclotetraphosphazenes. In polyphos‐phazenes with an alkoxybiphenyl moiety, no mesomorphic phase was observed. The molecular structure of cyclotriphosphazenes facilitated the formation of a mesomorphic layer structure; in contrast, the formation of a mesomorphic layer structure did not occur in cyclotetraphosphazenes 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 was −190 μ C m −2 at 436 K in 25 μ in cell using the triangular‐wave method. © 1998 John Wiley & Sons, Ltd.