Adeka Corporation

Ryoya Otsuki

Koichi Shigeno

Yosuke Maeda

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. R- R, Y, Yrepresents hydrogen atom, a group of formula (II) or (II'), etc., and Anrepresents a q-valent anion, provided that at least Ris a group of formula (II) or (II&#x2032;) or Anis an ion of formula (III); R- Reach represents a hydrogen atom, hydroxyl group, etc.; Z, Zrepresents a Calkyl group, etc. In formula (II&#x2032;), the bond between G&#x2032; and T&#x2032; is a double bond or a conjugated double bond; G&#x2032; represents a carbon atom; T&#x2032; represents a carbon atom or a nitrogen atom; the ring including G&#x2032; and T&#x2032; represents a 6-membered ring, etc.; w&#x2032; is 0-4; and Rrepresents a hydrogen atom, hydroxy, etc. In formula (III), Rand Rrepresents a halogen-substituted Calkyl group. 

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Tokyo, Japan

Ryoya Otsuki