Near infrared absorbers and display/recording materials prepared by using same

摘要

Near infrared absorbers which have a molecular extinction coefficient of 200,000 or more and are represented by the formula (I) <CHEM> wherein each of Y<1>, Y<2>, Y<3>, Y<4>, Y<5>, Y<6>, Y<7> and Y<8> is hydrogen, an alkyl group, alkoxyl group or alkylthio group; each of A<1>, A<2>, A<3>, A<4>, A<5>, A<6>, A<7> and A<8> is hydrogen, halogen, a nitro group, alkyl group, aralkyl group, alkenyl group, alkynyl group, alkoxyl group, aryloxy group, alkylthio group or arylthio group; and Met represents two hydrogen atoms or a metal, are useful for the production of optical display and recording materials.