| 摘要 |
PURPOSE:To obtain thioindigo which exhibits photochromism, can form a monomolecular film and is suitable for use as an information recording material, by synthesizing thioindigo through a thiol by starting with a 12-25C long-chain alkylbenzene. CONSTITUTION:A 12-25C long-chain alkylbenzene is used as a starting material to synthesize a thiol therefrom by sulfonation, etc., and an indoxyl group is formed through a thioglycolic acid therefrom to produce a thioindigo of formula I or II (wherein R1, R2 are each a 12-15C alkyl). In the resulting thioindigo, a 12-25C long-chain alkyl group in the dye skeleton has hydrophobicity and the dye skeleton moiety acts as a hydrophilic group. Thus, a good monomolecular film can be formed at the interface between gas and liquid by an amphipathic action. An ultrathin film can be prepd. by Langmuir's project method.
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