| 摘要 |
PROBLEM TO BE SOLVED: To provide a cyanine compound having a maximum absorption in a wavelength range of 400-1,100 nm, high in solubility in a solvent such as ketone etc., and excellent in workability, and to provide an optical filter for the use of near infrared absorption and image property improvement.SOLUTION: A cyanine compound is represented by formula (1), wherein, Qand Qform a nitrogen-containing condensed heterocyclic ring; Rand Reach independently represent an alkyl group that may have a substitution group or an alkenyl group that may have a substitution group; D represents a connecting group for forming mono-, di-, or tri-carbocyanine; and X- represents tris(halogenoalkylsulfonyl)methide anion. |
