| 摘要 |
PURPOSE:To provide the titled material composed of a novel thioindigo compound containing long-chain alkyl group, storable for a long period without causing discoloration after the color change induced by photo-irradiation, useful as an information recording medium and capable of forming a high-quality accumulated monomolecular films. CONSTITUTION:The compound of formula [R is -CnH2n+1 (n is integer of >=10); X is none or a bond such as -OCO-, -COO-, etc.; A is derivative of benzene ring, naphthalene ring, etc.] is used as the objective material. The compound of formula can be synthesized e.g. by reacting n-octadecylbenzene with sulfuric acid, converting the resultant p-octadecylbenzenesulfonic acid through its chloride, p-octadecylthiophenol and p-octadecylphenylthioglycol to 5- octadecylthioindoxyl and reacting the product with a potassium ferricyanide.
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