Liquid crystallinity of newly synthesized glucose derivatives with mesogenic side chains

Autor:	Bhavna Hirani, Hiroshi Kou-Shou, Junji Watanabe
Rok vydání:	1997
Předmět:	chemistry.chemical_classification Materials science Bilayer Mesogen General Chemistry Condensed Matter Physics Crystallography Crystallinity chemistry Liquid crystal Phase (matter) Side chain Moiety Organic chemistry General Materials Science Alkyl
Zdroj:	Liquid Crystals. 23:59-67
ISSN:	1366-5855 0267-8292
Popis:	Synthesis of glucose derivatives by direct esterification of the five available sites on D-(+)-glucose with side chains containing a biphenyl mesogenic moiety, a pentyl spacer and an alkyl tail is reported for the first time. Liquid crystalline phase behaviour of these glucose derivatives was studied by optical microscopy, thermal and X-ray diffraction methods. A layered arrangement of the smectic A (SmA) type was commonly observed in the above materials. An increase in the length of the alkyl tail results in a change of the phase structure from smectic Ai(SmAi), intercalated layer phase, to smectic As(SmAs), segregated bilayer phase. From the transition temperature and enthalpy observations, the SmAs phase has higher order than the SmAi phase. Cholesteric and chiral smectic C phases were also observed in addition to the SmA for some of the glucose derivatives, demonstrating a potential for preparing chiral liquid crystals.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::cc5a876f099ce4935a344d0e111494ca https://doi.org/10.1080/026782997208677 Zobrazit plný text záznamu