Cyanine compound, optical filter, and optical recording material

摘要

A cyanine compound of formula (I), an optical filter containing the cyanine compound, and an optical recording material containing the cyanine compound which is used to form an optical recording layer of an optical recording medium: <CHEM> wherein ring A represents benzene or naphthalene; R<1> and R<2> each represent hydrogen, halogen, nitro, cyano, C1-C8 alkyl, C1-C8 alkoxy or C6-C30 aryl; R<3> represents hydrogen, C1-C8 alkyl or C6-C30 aryl; X represents oxygen, sulfur, selenium, -CR<4>R<5>-, - NH- or -NY'-; Y<1> and Y<2> each represent hydrogen or C1-C30 organic group; R<4> and R<5> each represent C1-C4 alkyl or benzyl, or R<4> and R<5> are taken together to form C3-C6 cycloalkane-1,1-diyl; and Y' represents C1-C30 organic group.