Ferroelectric liquid crystals for nonlinear optics applications
US5543078A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 1993 |
| Grant date | Aug 6, 1996 |
| Priority date | — |
| Expiry date | Nov 19, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/3613
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention provides ferroelectric liquid crystal and liquid crystal compounds, among which are compounds which possess large X.sup.(2), i.e. second order nonlinear susceptibility and thus make them useful in optical and nonlinear optical applications. The invention includes chiral nonracemic compounds of formula ##STR1## where one of n or m is 1; k is 1 and B is COO or OOC; R' is a straight-chain or branched alkyl or monoalkene group having from 1 to 20 carbon atoms where one or more of the non-neighboring carbon atoms in R', except any unsaturated carbon atoms, can be replaced with O, S or a Si(CH.sub.3).sub.2 group; and R' is a chiral nonracemic tail group selected from the group consisting of --O--C*H(CH.sub.3)R.sub.c, --O--C*H(CH.sub.3)COOR.sub.d and --O--CH.sub.2 C*HF--C*HF--R.sub.6 in which the * indicates an asymmetric carbon enriched in one stereoconfiguration which for --O--CH.sub.2 C*HF--C*HF--R.sub.e is either the (S,S) or (R,R) stereoconfiguration wherein: R.sub.c is a straight-chain or branched alkyl or monoalkene group having 2 to 15 carbon atoms; R.sub.d is a straight-chain or branched alkyl or monoalkene group having 2 to 13 carbon atoms and R.sub.e is a …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.