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  Mesomorphic properties of the neat enantiomers of a chiral pyramidic liquid crystal

Luz, Z., Poupko, R., Wachtel, E. J., & Zimmermann, H. (2009). Mesomorphic properties of the neat enantiomers of a chiral pyramidic liquid crystal. Physical Chemistry Chemical Physics, 11(41), 9562-9568. doi:10.1039/b908029p.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-11AA-0 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-11AB-E
Genre: Journal Article
Alternative Title : Mesomorphic properties of the neat enantiomers of a chiral pyramidic liquid crystal

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 Creators:
Luz, Zeev, Author
Poupko, Raphy, Author
Wachtel, Ellen J., Author
Zimmermann, Herbert1, 2, Author              
Affiliations:
1Department of Molecular Physics, Max Planck Institute for Medical Research, Max Planck Society, ou_1497705              
2Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society, ou_1497700              

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 Abstract: The crown form of nona-octanoyloxy tribenzocyclononatriene (C8) with C(3) symmetry was prepared and separated into its enantiomers (C8A and C8B) by HPLC. Like the racemate, the neat enantiomers are also mesogenic, exhibiting two mesophases, M and Col(h). Differential scanning calorimetry, X-ray diffraction, carbon-13 NMR and UV circular dichroism are used to study the structural and dynamic properties of these chiral mesophases. The high-temperature mesophase (Col(h)) was identified by X-ray diffraction as columnar hexagonal; this phase is thermally unstable, undergoing racemization on heating before its clearing point is reached. The low-temperature mesophase (M) is most likely also columnar, but its symmetry could not be determined. In comparison with the racemate, the chiral mesophases are less well ordered, more tightly packed and they have a lower tendency to crystallize. On the other hand they are considerably more mobile, as reflected in their NMR spectra. No helical structure has been identified in the X-ray diffraction of the mesophases.

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Language(s): eng - English
 Dates: 2009-04-212009-07-282009-08-202009-11-07
 Publication Status: Published in print
 Pages: 7
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: eDoc: 664612
DOI: 10.1039/b908029p
URI: http://www.ncbi.nlm.nih.gov/pubmed/19830342
Other: 7529
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Title: Physical Chemistry Chemical Physics
  Abbreviation : Phys. Chem. Chem. Phys.
Source Genre: Journal
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Publ. Info: Cambridge, England : Royal Society of Chemistry
Pages: - Volume / Issue: 11 (41) Sequence Number: - Start / End Page: 9562 - 9568 Identifier: ISSN: 1463-9076
CoNE: /journals/resource/954925272413_1