Patent ID: 8303863

Claim:
A dispersion, comprising: an aqueous medium; and fine particles which comprise a compound represented by formula (2) or (3): wherein, Z 1a and Z 1b each independently represent an atomic group that forms an aryl ring or a heteroaryl ring; R 5a and R 5b each independently represent an aryl group having 6 to 20 carbon atoms, a heteroaryl group having 4 to 20 carbon atoms, an alkyl group having 1 to 20 carbon atoms, an alkoxycarbonyl group having 1 to 20 carbon atoms, a carboxyl group, a carbamoyl group having 1 to 20 carbon atoms, a halogen atom, or a cyano group; R 5a or R 5b may be bonded to Z 1a or Z 1b to form a condensed ring; wherein each of R 5a and R 5b is in an ortho position; R 22 and R 23 each independently represent a cyano group, an acyl group having 1 to 6 carbon atoms, an alkoxycarbonyl group having 1 to 6 carbon atoms, an alkylsulfinyl or arylsufinyl group having 1 to 10 carbon atoms, or a nitrogen-containing heteroaryl group having 3 to 20 carbon atoms, or R 22 and R 23 are bonded to each other to form a cyclic acidic nucleus; R 4 represents a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, a heteroaryl group having 4 to 20 carbon atoms, a metal atom, or a substituted boron having at least one substituent selected from a halogen atom, an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 20 carbon atoms, and a heteroaryl group having 4 to 20 carbon atoms; and R 4 may be covalently bonded or coordinately bonded to R 23 ; and the compound may further be substituted; wherein, R 31a and R 31b each independently represent an alkyl group having 1 to 20 carbon atoms, or a heteroaryl group having 3 to 20 carbon atoms; R 32 represents a cyano group, an acyl group having 1 to 6 carbon atoms, an alkoxycarbonyl group having 1 to 6 carbon atoms, an alkylsulfinyl or arylsulfinyl group having 1 to 10 carbon atoms, or a nitrogen-containing heteroaryl group having 3 to 10 carbon atoms; R 6 and R 7 each independently represent a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 10 carbon atoms, or a heteroaryl group having 4 to 10 carbon atoms; R 6 may be bonded to R 7 to form a ring, and the formed ring is an alicyclic ring having 5 to 10 carbon atoms, an aryl ring having 6 to 10 carbon atoms, or a heteroaryl ring having 3 to 10 carbon atoms; R 8 and R 9 each independently represent an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an aryl group having 6 to 20 carbon atoms, or a heteroaryl group having 3 to 10 carbon atoms; and X represents an oxygen atom, a sulfur atom, —NR—, or —CRR′—; in which R and R′ each independently represent a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, or an aryl group having 6 to 10 carbon atoms wherein a particle diameter of the fine particles is 1 nm or more and 1000 nm or less.