Azo compound and ink containing the compound

An azo compound represented by the following general formula (VIII):

• wherein
• R601 and R602 each independently represent an optionally substituted branched alkyl group having 7 to 20 carbon atoms,
• D9 represents a hydrogen atom, a halogen atom, an optionally substituted alkyl group having 1 to 20 carbon atoms, an optionally substituted alkoxy group having 1 to 20 carbon atoms, an —NHCOR603 group, or an —NHSO2R608 group,
• R603 and R608 each independently represent an optionally substituted alkyl group having 1 to 20 carbon atoms, an optionally substituted aryl group having 6 to 20 carbon atoms, or an optionally substituted heteroaryl group having 2 to 20 carbon atoms,
• a represents an integer of 1 to 4, and when a is 2 or larger, two or more D9 groups present in one molecule may be the same or different,
• A3 represents a halogen atom, a cyano group, an optionally substituted alkyl group having 1 to 20 carbon atoms, an optionally substituted aryl group having 6 to 20 carbon atoms, an optionally substituted heteroaryl group having 2 to 20 carbon atoms, an optionally substituted alkoxy group having 1 to 20 carbon atoms, or a —COOR604 group,
• R604 represents an optionally substituted alkyl group having 1 to 20 carbon atoms, an optionally substituted aryl group having 6 to 20 carbon atoms, or an optionally substituted heteroaryl group having 2 to 20 carbon atoms,
• A4 represents a halogen atom, an optionally substituted alkyl group having 1 to 20 carbon atoms, an optionally substituted alkenyl group having 2 to 20 carbon atoms, an optionally substituted alkylcarbonyl group having 2 to 20 carbon atoms, an optionally substituted alkoxycarbonyl group having 2 to 20 carbon atoms, a formyl group, an R605OOC(NC)C═CH— group, or an NC(NC)C═CH— group,
• R605 represents an optionally substituted alkyl group having 1 to 20 carbon atoms, an optionally substituted aryl group having 6 to 20 carbon atoms, or an optionally substituted heteroaryl group having 2 to 20 carbon atoms,
• X2 represents a nitrogen atom, or a methine group which may have a halogen atom, a cyano group, or a —COOR607 group as a substituent, and
• R607 represents an optionally substituted alkyl group having 1 to 20 carbon atoms, an optionally substituted aryl group having 6 to 20 carbon atoms, or an optionally substituted heteroaryl group having 2 to 20 carbon atoms.

An azo compound represented by the following general formula (IX):

• wherein
• R701 and R702 each independently represent an optionally substituted branched alkyl group having 5 to 20 carbon atoms,
• D11 represents a hydrogen atom, a halogen atom, an optionally substituted alkyl group having 1 to 20 carbon atoms, an optionally substituted alkoxy group having 1 to 20 carbon atoms, an —NHCOR703 group, or an —NHSO2R708 group,
• R703 and R708 each independently represent an optionally substituted alkyl group having 1 to 20 carbon atoms, an optionally substituted aryl group having 6 to 20 carbon atoms, or an optionally substituted heteroaryl group having 2 to 20 carbon atoms,
• d represents an integer of 1 to 4, and when d is 2 or larger, two or more D11 groups present in one molecule may be the same or different,
• A5 represents a hydrogen atom, a halogen atom, a cyano group, an optionally substituted alkyl group having 1 to 20 carbon atoms, an optionally substituted aryl group having 6 to 20 carbon atoms, an optionally substituted heteroaryl group having 2 to 20 carbon atoms, an optionally substituted alkoxy group having 1 to 20 carbon atoms, or a —COOR704 group,
• R704 represents an optionally substituted alkyl group having 1 to 20 carbon atoms, an optionally substituted aryl group having 6 to 20 carbon atoms, or an optionally substituted heteroaryl group having 2 to 20 carbon atoms,
• D10 represents a hydrogen atom, a halogen atom, a cyano group, an optionally substituted alkyl group having 1 to 20 carbon atoms, an optionally substituted alkoxy group having 1 to 20 carbon atoms, a —COOR706 group, a —COR709 group, or an —OCOR710 group,
• b represents an integer of 1 to 5, and when b is 2 or larger, two or more D10 groups present in one molecule may be the same or different,
• R706, R709, and R710 each independently represent an optionally substituted alkyl group having 1 to 20 carbon atoms, an optionally substituted aryl group having 6 to 20 carbon atoms, or an optionally substituted heteroaryl group having 2 to 20 carbon atoms,
• X3 represents a nitrogen atom, or a methine group which may have a halogen atom, a cyano group, or a —COOR707 group as a substituent, and
• R707 represents an optionally substituted alkyl group having 1 to 20 carbon atoms, an optionally substituted aryl group having 6 to 20 carbon atoms, or an optionally substituted heteroaryl group having 2 to 20 carbon atoms.