Azo compound, ink composition, ink jet recording method, and colored article

An azo compound represented by the following formula (1), a tautomer thereof, or a salt of the azo compound or the tautomer:

• wherein,
• R1 represents a C1-C4 alkyl group;
• a C1-C4 alkyl group substituted with a carboxy group;
• a phenyl group;
• a phenyl group substituted with a sulfo group;
• or a carboxy group,
• R2 represents a cyano group;
• a carbamoyl group;
• or a carboxy group,
• R3 and R4 each independently represents a hydrogen atom;
• a C1-C4 alkyl group;
• a C1-C4 alkoxy group;
• a halogen atom;
• or a sulfo group,
• R5 represents a C1-C4 alkylthio group;
• a C1-C4 alkylthio group substituted with at least one group selected from the group consisting of a hydroxy group, a sulfo group, and a carboxy group;
• a C1-C4 alkoxy group;
• a C1-C4 alkoxy group substituted with at least one group selected from the group consisting of a hydroxy group, a sulfo group, and a carboxy group;
• or a group represented by the following formula (2),
• R6 represents a C1-C4 alkylthio group;
• a C1-C4 alkylthio group substituted with at least one group selected from the group consisting of a hydroxy group, a sulfo group, and a carboxy group;
• a C1-C4 alkoxy group;
• a C1-C4 alkoxy group substituted with at least one group selected from the group consisting of a hydroxy group, a sulfo group, and a carboxy group;
• or a group represented by the following formula (2),
• R7 represents a C1-C4 alkylthio group;
• a C1-C4 alkylthio group substituted with at least one group selected from the group consisting of a hydroxy group, a sulfo group, and a carboxy group;
• a C1-C4 alkoxy group;
• a C1-C4 alkoxy group substituted with at least one group selected from the group consisting of a hydroxy group, a sulfo group, and a carboxy group;
• or a group represented by the following formula (2),
• R8 to R10 each independently represents a hydrogen atom;
• a carboxy group;
• a sulfo group;
• a C1-C4 alkylcarbonylamino group;
• a halogen atom;
• a C1-C4 alkyl group;
• a C1-C4 alkoxy group;
• a C1-C4 alkoxy group substituted with at least one group selected from the group consisting of a hydroxy group, a (C1-C4) alkoxy group, a sulfo group, and a carboxy group;
• or a group represented by the following formula (2),
• R11 to R13 each independently represents a hydrogen atom;
• a carboxy group;
• a sulfo group;
• a hydroxy group;
• an acetylamino group;
• a halogen atom;
• a cyano group;
• a nitro group;
• a sulfamoyl group;
• a C1-C4 alkyl group;
• a C1-C4 alkoxy group;
• a C1-C4 alkoxy group substituted with at least one group selected from the group consisting of a hydroxy group, a C1-C4 alkoxy group, a sulfo group, and a carboxy group;
• a C1-C4 alkylsulfonyl group;
• or a C1-C4 alkylsulfonyl group substituted with at least one group selected from the group consisting of a hydroxy group, a sulfo group, and a carboxy group, and
• at least one of R5 to R10 is a group represented by the following formula (2):
• wherein,
• R14 represents an anilino group having at least one sulfo group as a substituent;
• or a naphthylamino group having at least one sulfo group as a substituent,
• each of the anilino group and the naphthylamino group is optionally further substituted with at least one substituent selected from the group consisting of a sulfo group, a carboxy group, a phosphate group, a sulfamoyl group, a carbamoyl group, a hydroxy group, a nitro group, a C1-C6 alkoxy group, an amino group, a mono- or di-C1-C6 alkylamino group, a mono- or diarylamino group, an acetylamino group, a ureido group, a C1-C6 alkyl group, a cyano group, a halogen atom, a C1-C6 alkylsulfonyl group, and a C1-C6 alkylthio group,
• R15 represents an anilino group;
• a naphthylamino group;
• a mono- or di-C1-C6 alkylamino group;
• a mono- or diarylamino group;
• an amino group;
• a C1-C6 alkylthio group;
• a phenylthio group;
• a phenoxy group;
• or a (C1-C6) alkoxy group;
• or a hydroxy group,
• the group as R15 is optionally further substituted with at least one substituent selected from the group consisting of a sulfo group, a carboxy group, a phosphate group, a sulfamoyl group, a carbamoyl group, a hydroxy group, an alkoxy group, an amino group, a mono- or di-C1-C6 alkylamino group, a mono- or diarylamino group, an acetylamino group, a ureido group, a C1-C6 alkyl group, a phenyl group, a furyl group, a pyridyl group, a cyano group, a halogen atom, a C1-C6 alkylsulfonyl group, a C1-C6 alkylthio group, and a sulfo C1-C6 alkylthio group, and
• in the formula (2), * represents a position of bonding.