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Zeitschriftenartikel

Solvation sites in mesophases of discotic liquid crystals

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

Goldfarb, D., Luz, Z., & Zimmermann, H. (1982). Solvation sites in mesophases of discotic liquid crystals. Journal de Physique. Colloques, 43(8), 1255-1258. doi:10.1051/jphys:019820043080125500.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0019-B022-6
Zusammenfassung
The deuterium quadrupole splitting, νQ, of C6D 6 dissolved in a number of discotic liquid crystals has been measured over the temperature range of the mesophase stability. Three different types of mesophases were used : (i) Dho, which is a columnar hexatic phase with ordered molecular stacking; (ii) Drd, which is a rectangular biaxial columnar phase with disordered molecular stacking ; (iii) a nematic discotic, ND. The three types of mesophases exhibit different temperature dependence of ν Q : In the Dho phase the splittings are relatively small and strongly temperature dependent. This behaviour is interpreted in terms of a fast dynamic equilibrium between two solvation sites consisting of (1) molecules intercalated within the discotic columns, and (II) molecules dissolved in the aliphatic side chain region between the columns. In the Drd phase the splittings are considerably larger and fairly constant with temperature indicating that solvation in this phase is predominantly in the intercalation site. Finally in the nematic phase the splittings are large and follow a Maier-Saupe type temperature dependence. This is consistent with the structure of the nematic phase where no different sites are expected.