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Terminal end-group efficiency for the nematic phase using model bicyclo[2.2.2]octanes.

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Title: Terminal end-group efficiency for the nematic phase using model bicyclo[2.2.2]octanes.
Authors: Löbbert, Andreas1, Kitney, Stuart P.1, Kelly, Stephen M.1 S.M.Kelly@hull.ac.uk, O'neill, Mary2, Stirner, Tom2
Source: Liquid Crystals. Dec2007, Vol. 34 Issue 12, p1357-1367. 11p. 6 Diagrams, 6 Charts, 1 Graph.
Subjects: Liquid crystal displays, Liquid crystals, Molecular dynamics, Glass transition temperature, Phase transitions, Physical & theoretical chemistry
Abstract: The synthesis is reported of new liquid crystals incorporating the 1,4-disubstituted bicyclo[2.2.2]octane ring and a series of substituents in a terminal position on the molecular core. The nature of the terminal substituent is varied from apolar with a small dipole moment to polar with a strong dipole moment. The angle of the dipole moment with respect to the molecular axis is also varied. An updated order of terminal group efficiency for substituents in a terminal position for the nematic phase is provided. The bicyclo[2.2.2]octane ring shields halogen substituents in a lateral position on phenyl rings attached to the bicyclooctane ring to a small degree and reduces the steric efects of these substituents, giving rise to high relative nematic-isotropic transition temperatures. [ABSTRACT FROM AUTHOR]
Copyright of Liquid Crystals is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 27832295
AccessLevel: 6
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PubTypeId: academicJournal
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  Data: Terminal end-group efficiency for the nematic phase using model bicyclo[2.2.2]octanes.
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  Data: <searchLink fieldCode="JN" term="%22Liquid+Crystals%22">Liquid Crystals</searchLink>. Dec2007, Vol. 34 Issue 12, p1357-1367. 11p. 6 Diagrams, 6 Charts, 1 Graph.
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  Data: <searchLink fieldCode="DE" term="%22Liquid+crystal+displays%22">Liquid crystal displays</searchLink><br /><searchLink fieldCode="DE" term="%22Liquid+crystals%22">Liquid crystals</searchLink><br /><searchLink fieldCode="DE" term="%22Molecular+dynamics%22">Molecular dynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Glass+transition+temperature%22">Glass transition temperature</searchLink><br /><searchLink fieldCode="DE" term="%22Phase+transitions%22">Phase transitions</searchLink><br /><searchLink fieldCode="DE" term="%22Physical+%26+theoretical+chemistry%22">Physical & theoretical chemistry</searchLink>
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  Data: The synthesis is reported of new liquid crystals incorporating the 1,4-disubstituted bicyclo[2.2.2]octane ring and a series of substituents in a terminal position on the molecular core. The nature of the terminal substituent is varied from apolar with a small dipole moment to polar with a strong dipole moment. The angle of the dipole moment with respect to the molecular axis is also varied. An updated order of terminal group efficiency for substituents in a terminal position for the nematic phase is provided. The bicyclo[2.2.2]octane ring shields halogen substituents in a lateral position on phenyl rings attached to the bicyclooctane ring to a small degree and reduces the steric efects of these substituents, giving rise to high relative nematic-isotropic transition temperatures. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Liquid Crystals is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1080/02678290701742961
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      – Code: eng
        Text: English
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        PageCount: 11
        StartPage: 1357
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      – SubjectFull: Liquid crystal displays
        Type: general
      – SubjectFull: Liquid crystals
        Type: general
      – SubjectFull: Molecular dynamics
        Type: general
      – SubjectFull: Glass transition temperature
        Type: general
      – SubjectFull: Phase transitions
        Type: general
      – SubjectFull: Physical & theoretical chemistry
        Type: general
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      – TitleFull: Terminal end-group efficiency for the nematic phase using model bicyclo[2.2.2]octanes.
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            NameFull: Kelly, Stephen M.
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              M: 12
              Text: Dec2007
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              Y: 2007
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