Azo pigments, pigment dispersion, coloring composition, and ink for inkjet recording

An azo compound represented by the general formula (2) or (2-1):

• wherein
• Y represents a hydrogen atom or an aliphatic group;
• R1 represents an aliphatic group, an aliphatic amino group, an arylamino group, a heterocyclic amino group, an acylamino group, a sulfonamido group, an amino group, or a heterocyclic group;
• R21 and R22 each independently represents an aliphatic amino group, an arylamino group, a heterocyclic amino group, an acylamino group, a sulfonamido group, an amino group, or a heterocyclic group;
• Z1 and Z2 each represent an electron-withdrawing group having a Hammett op value of 0.2 or more;
• X2 represents a nitrogen atom or C—R5, R5 represents a hydrogen atom, a cyano group, a carbamoyl group, an aliphatic oxycarbonyl group, or a carboxyl group;
• R6 represents a hydrogen atom, an aliphatic group, an aryl group, or a heterocyclic group;
• G0 represents an aliphatic group;
• G1 represents a 5- or 6-membered ring together with carbon atoms and a nitrogen atom(s), the heterocyclic ring may be an aromatic ring or a condensed ring;
• Y21 represents a hydrogen atom or a methyl group;
• n represents an integer of from 1 to 4;
• when n=2, the general formula (1) represents a dimer formed through R1, R21, R22, R6, Y, Y21, Z1, Z2, G0, or G1;
• when n=3, the general formula (1) represents a trimer formed through R1, R21, R22, R6, Y, Y21, Z1, Z2, G0, or G1;
• and
• when n=4, the general formula (1) represents a tetramer formed through R1, R21, R22, R6, Y, Y21, Z1, Z2, G0, or G1.