| 摘要 |
PURPOSE:To erase color by decomposition by irradiating a specified near infrared absorbing cation dye-boron anion complex showing absorption in a near infrared region with near infrared ray. CONSTITUTION:The cation dye-boron anion complex expressed by formula I showing absorption in a near infrared region is decomposed to erase the color by irradiation to near infrared ray at >=700nm wavelength. In formula, D<+> is a cation dye having absorption in a near infrared region, R1, R2, R3 and R4 are independently alkyl, aryl, alkalyl, allyl, aralkyl, alkenyl alkinyl, silyl, alicyclic, and satd. or unsatd. heterocyclic groups, or substd. alkyl, substd. aryl, substd. alkalyl, substd. allyl, substd. aralkyl, substd. alkenyl, substd. alkinyl, substd. silyl groups, and at least one of R1, R2, R3 and R4 is an alkyl group of 1-8 carbon number. |
