Heptamethine cyanine compounds as near infrared absorbing dyes and Preparation method of the same

摘要

The present invention relates to a hepta-methine cyanine compound and a preparation method thereof that can be useful as a light absorbing agent, in particular near infrared absorbing dye, and more particularly 2-chloro-3- (hydroxy-methylene) -5- (4- nitrophenyl) cyclohexanecarboxylic cover by condensing an indole derivative with an aldehyde center, on either side, relates to novel compounds and a method for producing substituted with a specific substituent. The compounds of the present invention is well suited for use as a component of the dye and the high-density optical recording medium for near-infrared absorption. ; Near infrared ray, cyanine methine heptadecyl, indole derivatives, bis-formyl-aldehyde derivative