PURPOSE: To provide a compd. which has an absorption wavelength in the vicinity of a laser beam-oscillating wavelength, can be well dissolved in liquid crystals, has goal light stability and is used in a liquid crystal which is displayed by laser beam, consiting of a specified anthraquinone derivative.
CONSTITUTION: Anthraquinone compds. of formula I [wherein R is (alkoxy, halogen, cyano, phenoxy, mirogen-contg. heterocyclic ring or cycloalkyl-substd.) alkyl, alkenyl, (alkyl-substd.) cycloalkyl, (alkyl, alkoxy-substd.)phenyl, tetraphydrofurfuryl, etc.] such as a compd. of formula II. The compds. have the maximum absorption at 700W900nm in the vicinity of a semiconductor laser beam- oscillating wavelength and are excellent in stability and solubility in liquid crystal, and used as a mixture with a liquid crystal, which can be displayed by irradiation with laser beam. The compds. of formula I can be obtd. by dissolving a compd. of formula III in o-di-chlorobenzene and passing H2S through the soln. at 45W180°C.
OZAWA TETSUO
IWANAMI JIYUNKO
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