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  Molecular ordering and dynamics in the columnar mesophase of a new dimeric discotic liquid crystal as studied by X-ray diffraction and deuterium NMR

Zamir, S., Poupko, R., Luz, Z., Hüser, B., Boeffel, C., & Zimmermann, H. (1994). Molecular ordering and dynamics in the columnar mesophase of a new dimeric discotic liquid crystal as studied by X-ray diffraction and deuterium NMR. Journal of the American Chemical Society, 116(5), 1973-1980. Retrieved from http://pubs.acs.org/doi/abs/10.1021/ja00084a042.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0019-A941-0 Version Permalink: https://hdl.handle.net/11858/00-001M-0000-002D-065B-7
Genre: Journal Article
Alternative Title : Molecular ordering and dynamics in the columnar mesophase of a new dimeric discotic liquid crystal as studied by X-ray diffraction and deuterium NMR

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JACS_116_1994_1973.pdf (Any fulltext), 803KB
 
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 Creators:
Zamir, S., Author
Poupko, Raphy, Author
Luz, Zeev, Author
Hüser, B., Author
Boeffel, C., 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 preparation and mesomorphic properties of a new discotic dimer, bis[pentakis(pentyloxy)triphenylenyloxyJdecane (DTHES) is described. This molecule is a perfect twin of the monomeric hexakis(penty1oxy)triphenylene (THES) in that both the spacer and the free alkyl chains are linked via ether bonds and the spacer is exactly twice the length of the free side chains. DTHES exhibits a columnar discotic phase which is completely miscible with that of THE5 and is thus classified as DA, Le. ordered hexagonal (D& X-ray diffraction measurements confirm the assignment and provide geometrical lattice parameters (a = 20.2 A; stacking distance of d = 3.48 A at room temperature) as well as correlation lengths for both (345 and 125 A, respectively). Deuterium NMR measurements of specifically deuterated DTHES in the mesophase region exhibit dynamic line shapes consistent with restricted, high-amplitude, planar librations of the monomeric subunits within the columns. A theory which considers the effect of this motion on the NMR line shape in terms of a diffusion equation in a restricting potential is developed and used to simulate the experimental spectra. The results of the analysis provide kinetic and model related parameters.

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Language(s): eng - English
 Dates: 1993-09-071994-01-01
 Publication Status: Issued
 Pages: -
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 Rev. Type: Peer
 Identifiers: eDoc: 666051
URI: http://pubs.acs.org/doi/abs/10.1021/ja00084a042
Other: 5452
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Title: Journal of the American Chemical Society
  Other : J. Am. Chem. Soc.
  Abbreviation : JACS
Source Genre: Journal
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Publ. Info: American Chemical Society
Pages: - Volume / Issue: 116 (5) Sequence Number: - Start / End Page: 1973 - 1980 Identifier: ISSN: 0002-7863
CoNE: https://pure.mpg.de/cone/journals/resource/954925376870