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N.M.R. and X-ray diffraction of the 7,7'-disodiumcromoglycate-water lyomesophases

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons128263

Zimmermann,  Herbert
Department of Molecular Physics, Max Planck Institute for Medical Research, Max Planck Society;
Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society;
Zimmermann Group, Max Planck Institute for Medical Research, Max Planck Society;
Emeritus Group Biophysics, Max Planck Institute for Medical Research, Max Planck Society;

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Zitation

Perahia, D., Luz, Z., Wachtel, E. J., & Zimmermann, H. (1987). N.M.R. and X-ray diffraction of the 7,7'-disodiumcromoglycate-water lyomesophases. Liquid Crystals, 2(4), 473-489. doi:10.1080/02678298708086304.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0019-AEAD-B
Zusammenfassung
Aqueous solutions of 7,7'-disodiumcromoglycate (7,7'-DSCG) form a variety of mesophases, whose natures depend on concentration and temperature. We have used optical microscopy, N.M.R. (of 2H, 17O and 23Na) and X-ray techniques to construct a phase diagram for this system and to characterize the various mesophases. In the concentration range 3 to 25 wt % 7,7'-DSCG four different mesophases are found. On cooling the isotropic solution an opaque gel phase is first obtained, followed on further cooling by a birefringent glassy liquid. At concentrations below 14wt% it is nematic, while at higher concentrations it appears to be a different, more ordered, phase. At lower temperatures a hexagonal phase is formed which finally solidifies on cooling to - 15°C. The N.M.R. and X-ray characteristics of these mesophases are discussed.