Fluorinated 4"-cyano substituted terphenyls
AssigneeThe Secretary of State for Defence in her Britannic Majesty's Government of the U.K. of Great Britain and Northern Ireland
InventorsDavid Coates, Ian Sage, Simon Greenfield, George W. Gray, David Lacey, Kenneth J. Toyne, Lawrence K. Chan, Michael Hird
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Abstract
Fluorinated 4"-cyano substituted terphenyls of general formula (I), wherein R.sub.1 is selected from alkenyl, H, R, RO and RCO where R is alkyl or perfluoroalkyl containing up to 12 carbon atoms, n is 1, 2 or 3 and the lateral fluorosubstituent(s) may be in any of the available substitution positions are provided. These have liquid crystalline properties and may be used as components of liquid crystal materials.
Claims11
Fluorinated 4"-cyanosubstituted terphenyl of the formula I:
- ##STR19## wherein R.sub.1 is selected from the group consisting of alkenyl, R, RO, RCO and hydrogen, where R is alkyl or perfluoroalkyl containing 1 to 12 carbon atoms;
- n is 1, 2 or 3;
- and the fluorosubstituent may be in any of the available lateral substitution positions.
A liquid crystal composition containing at least two components, at least one being a fluorinated 4"-cyanosubstituted terphenyl of the formula I:
- ##STR20## wherein R.sub.1 is selected from the group consisting of alkenyl, R, RO, RCO and hydrogen, where R is alkyl or perfluoroalkyl containing 1 to 12 carbon atoms;
- n is 1, 2 or 3;
- and the fluorosubstituent may be in any of the available lateral substitution positions.
Dependencies are inferred from the claim text.