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  On the solid polymorphs of the discotic mesogen hexa-octanoyloxytriphenylene

Zamir, S., Spielberg, N., Zimmermann, H., Poupko, R., & Luz, Z. (1995). On the solid polymorphs of the discotic mesogen hexa-octanoyloxytriphenylene. Liquid Crystals, 18(5), 781-786. doi:10.1080/02678299508036690.

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Genre: Journal Article
Alternative Title : On the solid polymorphs of the discotic mesogen hexa-octanoyloxytriphenylene

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LiqCryst_18_1995_781.pdf (Any fulltext), 457KB
 
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Zamir, S., Author
Spielberg, N., Author
Zimmermann, Herbert1, 2, Author              
Poupko, Raphy, Author
Luz, Zeev, 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: In an earlier study by van Hecke et al., it was shown that the discotic mesogen hexa-octanoyloxytriphenylene (HAT8) crystallizes in four different solid forms, depending on the thermal history of the sample. The present study is an attempt to characterize three of these solids in more detail using X-ray, carbon-13 and deuterium NMR techniques. It is shown that van Hecke's modification IV is a metastable amorphic solid, while modifications III and II are highly ordered crystalline solids. Both are apparently monoclinic, but with different unit cell dimensions. In all solid phases, the triphenylene core is static on the NMR time-scale, but the side chains are disordered to different degrees in the different modifications. Further NMR studies on the discotic mesophase of HAT8 are also reported.

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Language(s): eng - English
 Dates: 1994-08-121994-10-082006-09-241995
 Publication Status: Published in print
 Pages: 6
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 Table of Contents: -
 Rev. Type: Peer
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Title: Liquid Crystals
Source Genre: Journal
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Publ. Info: London : Taylor & Francis
Pages: - Volume / Issue: 18 (5) Sequence Number: - Start / End Page: 781 - 786 Identifier: ISSN: 0267-8292
CoNE: https://pure.mpg.de/cone/journals/resource/954925268301