C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
C09K 19/58 (2006.01) C09K 19/02 (2006.01) G02F 1/13 (2006.01)
Patent
CA 2250867
This invention provides chiral thioindigo compounds for doping smectic liquid crystal hosts, wherein the compounds modulate a chiral bulk property of an induced chiral smectic liquid crystal phase upon irradiation at a wavelength in the visible range. Modulation of the chiral bulk property is effected by reversible trans-cis photoisomerization of the compound upon irradiation. The compounds maintain their rod-like shape in both isomeric forms, and hence do not destabilize the chiral smectic liquid crystal phase. Compounds according to the invention are useful in optical devices such as optical switches, displays, and memory.
Cette invention se rapporte à des composés thio-indigo chiraux servant au dopage de dispositifs hôtes à cristaux liquides smectiques, dans lesquels les composés en question modulent une propriété générale chirale d'une phase cristal liquide smectique chirale induite, lors de l'exposition à un rayonnement d'une longueur d'onde comprise dans le spectre visible. La modulation de la propriété générale chirale est effectuée par photo-isomérisation trans-cis réversible du composé lors de l'exposition au rayonnement. Ces composés conservent leur configuration en bâtonnets dans les deux formes isomères et, partant, ne destabilisent pas la phase cristal liquide smectique chirale. Ces composés sont utiles dans des dispositifs optiques tels que commutateurs optiques, visuels et mémoires.
Dinescu Liviu
Lemieux Robert P.
Queen's University At Kingston
Scribner Stephen J.
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