HEPTAMETHINE CYANINE COMPOUNDS AS NEAR INFRARED ABSORBING DYES AND PREPARATION METHOD OF THE SAME

摘要

PURPOSE: A heptamethine cyanine compound used as a near infrared ray absorbing pigment and a method for preparing the same are provided. CONSTITUTION: A heptatmethine cyanine compound is denoted by chemical formula 1. The range of maximal absorbing wave length of the compound is 750-800 nm. A near infrared ray absorbing pigment contains the heptamethine cyanine compound. The pigment is blue. The heptamethine cyanine compound of chemical formula 1 is prepared by thermal reflux of a compound of chemical formula 2 with a compound of chemical formula 3.