Bulletin of the Chemical Society of Japan p. 346 - 351 (1994)
Update date:2022-08-10
Topics:
Ma, Yung-Dae
Takada, Akihiko
Sugiura, Makoto
Fukuda, Takeshi
Miyamoto, Takeaki
Watanabe, Junji
n-Alkyl 1-O-β-D-cellobiosides with an alkyl length ranging from 7 to 18 in carbon number m were synthesized, and their thermal properties were studied in comparison with those of the already-known monosaccharide homologues, n-alkyl 1-O-β-D-glucopyranosides.The cellobiosides were found to exhibit a thermotropic mesophase at higher temperatures than the glucopyranosides.Depending on m and thermal history, the cellobiosides showed various textures such as homeotropic, transient batonnets, polygonal, and fan-shaped textures.Like in the case of the monosaccharide homologues, the difficulty of aligning the samples prohibited a full classification of the mesophase, but the X-ray diffractograms of the unaligned cellobiosides indicated that their mesophase belongs to smectic A (or less possibly, smectic C).The m dependence of the lamella thickness was much weaker than (about half) that of the monosaccharide homologues.Possible molecular arrangements of the cellobiosides in the mesophase were presented.
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