Terminal end-group efficiency for the nematic phase using model bicyclo[2.2.2]octanes |
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Institution: |
a Department of Chemistry, University of Hull, Hull HU6 7RX, UK
b Department of Physics, University of Hull, Hull HU6 7RX, UK |
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Abstract: | The synthesis is reported of new liquid crystals incorporating the 1,4-disubstituted bicyclo2.2.2]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 bicyclo2.2.2]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. |
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