Claims
- 1. A compound of the formula: ##STR58## wherein R.sub.1 and R.sub.2, independently of one another, are selected from the group consisting of alkyl, cycloalkyl, alkenyl, alkoxy, thioalkyl and alkylsilyl, groups having from 1-20 carbon atoms; Y can be --CH.sub.2 O--, --COO--, --OOC-- or --OCH.sub.2 --; and Ar.sub.1 and Ar.sub.2, independently of one another, are selected from the group consisting of 1,4-phenyl, mono- or difluorinated 1,4-phenyl, 2,5-pyridinyl, 2,5-pyrimidyl, 2,5-pyrazinyl, 2,5-thiadiazole, 3,6-pyridazinyl and trans-1,4-cyclohexyl wherein at least one of Ar.sub.1 or Ar.sub.2 is a nitrogen-containing aromatic ring.
- 2. A compound according to claim 1 wherein Y is --O--CH.sub.2 -- or --CH.sub.2 --O--.
- 3. A compound according to claim 2 wherein one of Ar.sub.1 or Ar.sub.2 is a 2,5-substituted pyrimidine.
- 4. A compound according to claim 3 wherein one of Ar.sub.1 or Ar.sub.2 is a 2,5-substituted pyridine.
- 5. A compound according to claim 2 wherein one of Ar.sub.1 or Ar.sub.2 is a 2,3-difluoro-1,4-substituted phenyl, a 2-fluoro-1,4-substituted phenyl or a 3-fluoro-1,4-substituted phenyl.
- 6. A compound according to claim 2 wherein one of Ar.sub.1 or Ar.sub.2 is a trans-1,4-cyclohexane.
- 7. A compound according to claim 2 wherein R.sub.1 and R.sub.2, independently of one another, are selected from the group consisting of alkyl, alkenyl, alkoxy and thioalkyl groups.
- 8. A compound according to claim 2 wherein R.sub.2 and R.sub.2, independently of one another, are alkyl or alkene groups.
- 9. A compound according to claim 8 wherein R.sub.1 and R.sub.2 contain five to twelve carbon atoms.
- 10. A compound according to claim 1 wherein Y is --OOC-- or --COO--.
- 11. A compound according to claim 10 wherein one of Ar.sub.1 or Ar.sub.2 is a 2,5-substituted pyrimidine.
- 12. A compound according to claim 10 wherein one of Ar.sub.1 or Ar.sub.2 is a 2,5-substituted pyridine.
- 13. A compound according to claim 10 wherein one of Ar.sub.1 and Ar.sub.2 is a 2,3-difluorine, 1,4-substituted phenyl, a 2-fluoro-1,4-substituted phenyl or a 3-fluoro-1,4-substituted phenyl.
- 14. A compound according to claim 10 wherein one of Ar.sub.1 or Ar.sub.2 is a trans-1,4-cyclohexane.
- 15. A compound according to claim 10 wherein R.sub.1 and R.sub.2, independently of one another, are selected from the group consisting of alkyl, alkenyl, alkoxy and thioalkyl groups.
- 16. A compound according to claim 10 wherein R.sub.1 and R.sub.2, independently of one another, are alkyl or alkene groups.
- 17. A compound according to claim 10 wherein R.sub.1 and R.sub.2 contain five to twelve carbon atoms.
- 18. A ferroelectric liquid crystal composition comprising one or more of the compounds of claim 1.
- 19. A ferroelectric liquid crystal composition comprising one or more of the compounds of claim 2.
- 20. A ferroelectric liquid crystal composition comprising one or more of the compounds of claim 10.
- 21. A compound according to claim 1 wherein Y is --OCH.sub.2 --.
- 22. A compound according to claim 21 wherein R.sub.1 and R.sub.2, independently of one another, are selected from the group consisting of alkyl, alkenyl, alkoxy and thioalkyl groups.
- 23. A compound according to claim 21 wherein R.sub.1 and R.sub.2, independently of one another, are alkyl or alkenyl groups.
- 24. A ferroelectric liquid crystal composition comprising one or more of the compounds of claim 21.
- 25. A compound according to claim 1 wherein Y is --OOC--.
- 26. A compound according to claim 25 wherein R.sub.1 and R.sub.2, independently of one another, are selected from the group consisting of alkyl, alkenyl, alkoxy and thioalkyl groups.
- 27. A compound according to claim 25 wherein R.sub.1 and R.sub.2, independently of one another, are alkyl or alkenyl groups.
- 28. A ferroelectric liquid crystal composition comprising one or more of the compounds of claim 25.
Government Interests
This invention was made with partial support of the United States Government under National Science Foundation grant number ISI 90000-40 and U.S. Army Research Office contract number DAAL03-91-C-0051. The United States Government has certain rights in this invention.
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