Phase structures of the N-acetyl-L-glutamic acid oligomeric benzyl esters (exact residue numbers 4, 6, 8, and 12)–dioxane systems and their optical properties |
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| Authors: | Hirofumi Okabayashi Makoto Ishida Haruhiro Yuki Norikatsu Hattori Hideki Masuda Charmian J. O'Connor |
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| Affiliation: | Department of Applied Chemistry, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan,
Department of Chemistry, The University of Auckland, Private Bag 92019, Auckland, New Zealand,
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| Abstract: | A series of N-acetyl-L-glutamic acid oligomeric benzyl esters with exact residue numbers (4, 6, 8, 10, and 12) has been synthesized by a stepwise procedure. It has been found that the phase maps of these oligomer-dioxane systems consist of three regions (I : an isotropic solution, II : a liquid crystalline phase, and III : a two-phase (I and II) solution). In particular, for the samples with residue numbers 6, 8, and 12, selective light scattering of coloured regions in the transparent II and III (bottom-layer) regions have been investigated by the use of UV-visible absorption spectra, leading to the conclusion that there exists a helical axis in the structure of the supramolecular aggregates formed by these oligomeric molecules. |
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