摘要:
Near infrared absorbers which have a molecular extinction coefficient of 200,000 or more and are represented by the formula (I) wherein each of Y¹, Y², Y³, Y⁴, Y⁵, Y⁶, Y⁷ and Y⁸ is hydrogen, an alkyl group, alkoxyl group or alkylthio group; each of A¹, A², A³, A⁴, A⁵, A⁶, A⁷ and A⁸ 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.
摘要:
Near infrared absorbers which have a molecular extinction coefficient of 200,000 or more and are represented by the formula (I) wherein each of Y¹, Y², Y³, Y⁴, Y⁵, Y⁶, Y⁷ and Y⁸ is hydrogen, an alkyl group, alkoxyl group or alkylthio group; each of A¹, A², A³, A⁴, A⁵, A⁶, A⁷ and A⁸ 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.