Infrared absorbing composition, infrared absorbing ink, recorded article, image recording method, and image detecting method

摘要

An infrared absorbing composition including a compound that is represented by formula (1) and has solubility of 30 mg/mL or less in toluene at 25°C, an organic solvent having a solubility parameter of from 7.3 to 12.1, and a resin is disclosed. In formula (1), each of R 1 to R 16 independently represents a hydrogen atom or a substituent group, provided that at least one of R 1 to R 16 represents an R 17 -X- group or that the compound represented by formula (1) contains at least one condensed-ring structure in which any adjacent two of R 1 to R 16 form a ring; X represents -S-, -NH-, -NR 18 -, or -O-; each of R 17 and R 18 independently represents an aliphatic group or an aryl group; and M represents two atoms selected from the group consisting of hydrogen atoms and monovalent metal atoms, or a divalent metal atom, or a divalent substituted metal atom moiety including a trivalent or tetravalent metal atom and a substituent group.