Compound having azo skeleton structure, pigment-dispersing agent, pigment composition, pigment dispersion, and toner

A compound comprising:

• a structure in which a moiety represented by the following formula (1) is bound to a polymer portion having a monomer unit represented by the following formula (2) via a linking group in the moiety,
• wherein in the formula (1),
• Ar1 represents
• an unsubstituted aryl group, or
• an aryl group substituted with at least one group selected from the group consisting of an alkyl group, an alkoxy group, a halogen atom, a hydroxy group, a cyano group, a trifluoromethyl group, a carboxy group, a carboxylate group, a carboxamide group, an SOOR9 group, an NR10SOOR11 group, and the linking group,
• R1 represents an alkyl group, a phenyl group, or the linking group,
• R2 to R6 each independently represent a hydrogen atom, an SOOR60 group, an NR61SOOR62 group, or the linking group,
• R9 and R60 each independently represent an OR12 group, an NR13R14 group, or an NR15CONR16R17 group,
• R10, R61, and R15 each independently represent a hydrogen atom or an alkyl group,
• R11 and R62 each independently represent an alkyl group, a phenyl group, or an aralkyl group,
• R12 represents a hydrogen atom, an alkyl group, a phenyl group, an aralkyl group, an alkali metal ion, or a quaternary ammonium ion,
• R13 and R14 each independently represent a hydrogen atom, an alkyl group, an aryl group, or an aralkyl group,
• R16 and R17 each independently represent a hydrogen atom, an alkyl group, a phenyl group, or an aralkyl group,
• Ar1 and R2 to R6 satisfy at least one of requirements i) and ii) described below,
• i) Ar1 represents an aryl group having the substituent, the aryl group having an SOOR9 group or an NR10SOOR11 group serving as the substituent, and
• ii) at least one of R2 to R6 represents an SOOR60 group or an NR61SOOR62 group, and wherein
• at least one group selected from the group consisting of R1, R2, R3, R4, R5, R6 and the substituent of Ar1 in the case that Ar1 represents an aryl group having the substituent, is the linking group;
• and
• wherein in the formula (2),
• R7 represents a hydrogen atom or an alkyl group, and
• R8 represents a phenyl group, a carboxy group, a carboxylate group, or a carboxamide group.