Importance

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Abstract

A near-infrared-ray absorbing material containing a cyanine compound per formula (I) exhibits a sharp light absorption in wavelength range 800-1000 nm, with excellent light resistance. R¹ - R⁴, Y¹, Y² represents hydrogen atom, a group of formula (II) or (II′), etc., and An^q− represents a q-valent anion, provided that at least R¹ is a group of formula (II) or (II′) or An^q− is an ion of formula (III); R¹¹ - R¹³ each represents a hydrogen atom, hydroxyl group, etc.; Z¹, Z² represents a C_1-10 alkyl group, etc. In formula (II′), the bond between G′ and T′ is a double bond or a conjugated double bond; G′ represents a carbon atom; T′ represents a carbon atom or a nitrogen atom; the ring including G′ and T′ represents a 6-membered ring, etc.; w′ is 0-4; and R^01′ represents a hydrogen atom, hydroxy, etc. In formula (III), R⁵ and R⁶ represents a halogen-substituted C_1-8 alkyl group.

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First Claim