Azo iron complex dye, ink composition containing same, and method for producing azo iron complex dye

A method for manufacturing an azo iron complex dye comprising:

• a step for an iron-complexation for preparing an azo iron complex anion by heating
• a disazo dye represented by the following chemical formula (5):
• wherein, in the chemical formula (5), R1 and R2 are each independently a straight or branched alkyl group having 3-10 carbon atoms, R3 is an electron-withdrawing group, R4 is a straight or branched alkyl group having 1-5 carbon atoms or a straight or branched alkoxy group having 1-5 carbon atoms,
• a monoazo dye represented by the following chemical formula (6):
• wherein, in the chemical formula (6), R5 is a nitro group, a sulfonamide group or a halogen atom, R6 is a hydrogen atom, a straight or branched alkyl group having 1-8 carbon atoms, a nitro group or a halogen atom, R7 is a hydrogen atom or a straight or branched alkyl group having 3-12 carbon atoms, and
• an ironizing agent,
• in a solvent and,
• a step for ion-exchanging by reacting the azo iron complex anion, and an alkali metal solution and/or an ammoniation agent to introduce a cation which is combined with the azo iron complex anion, for obtaining a disazo-monoazo iron complex represented by the following chemical formula (1):
• wherein, in the chemical formula (1), R1-R4 are the same as ones of the chemical formula (5), R5-R7 are the same as ones of the chemical formula (6), and A+ is a monovalent cation.