Azo compound, azo pigment, dispersion containing the azo compound or azo pigment, coloring composition, ink for inkjet recording, ink tank for inkjet recording, inkjet recording method and recorded material

An azo pigment represented by the following formula (2), its tautomer, or a salt or hydrate thereof:

• (wherein R′1, R′2 and Y′ each independently represents a hydrogen atom, a linear or branched alkyl group having a carbon number of 1 to 4, an alkenyl group having a carbon number of 2 to 4, an alkynyl group having a carbon number of 2 to 4, an acyl group having a carbon number of 1 to 5, an aralkyl group having a carbon number of 7 to 9, a 5- to 8-membered saturated or unsaturated hydrocarbon ring group, or a 5- to 8-membered saturated or unsaturated heterocyclic group;
• R′3 represents a hydrogen atom or a monovalent substituent;
• Z′ represents an electron-withdrawing group having a Hammett's σp value of 0.2 or more;
• X represents a heteroatom at the position adjacent to the carbon atom bonded to the pyrazole ring;
• G1 represents an atomic group for forming a 5- to 8-membered saturated or unsaturated heterocyclic ring;
• when any one of R′1, R′2, R′3, Y′ and G1 represents a 5- to 8-membered saturated or unsaturated heterocyclic ring, the ring is a monocyclic ring or a condensed ring;
• and when any one of R′1, R′2, R′3, Y′ and G1 represents a 5-membered unsaturated heterocyclic ring, the ring contains two or more nitrogen atoms therein).

An azo compound represented by the following formula (2):

• (wherein R′1, R′2 and Y′ each independently represents a hydrogen atom, a linear or branched alkyl group having a carbon number of 1 to 4, an alkenyl group having a carbon number of 2 to 4, an alkynyl group having a carbon number of 2 to 4, an acyl group having a carbon number of 1 to 5, an aralkyl group having a carbon number of 7 to 9, a 5- to 8-membered saturated or unsaturated hydrocarbon ring group, or a 5- to 8-membered saturated or unsaturated heterocyclic group;
• R′3 represents a hydrogen atom or a monovalent substituent;
• Z′ represents an electron-withdrawing group having a Hammett's σp value of 0.2 or more;
• X represents a heteroatom at the position adjacent to the carbon atom bonded to the pyrazole ring;
• G1 represents an atomic group for forming a 5- to 8-membered saturated or unsaturated heterocyclic ring;
• when any one of R′1, R′2, R′3, Y′ and G1 represents a 5- to 8-membered saturated or unsaturated heterocyclic ring, the ring is a monocyclic ring or a condensed ring;
• and when any one of R′1, R′2, R′3, Y′ and G1 represents a 5-membered unsaturated heterocyclic ring, the ring contains two or more nitrogen atoms therein).

An azo compound represented by the following formula (4):

• (wherein R1, R2, R3, Y and Z each independently represents a hydrogen atom or a substituent;
• n represents an integer of 2 to 4;
• X represents a heteroatom at the position adjacent to the carbon atom bonded to the pyrazole ring;
• G2 represents an atomic group for forming a 5-to 8-membered saturated or unsaturated heterocyclic ring;
• the formula represents a dimer through R1, R2, R3, Y, Z or G2 when n is 2, represents a trimer through R1, R2, R3, Y, Z or G2 when n is 3, and represents a tetramer through R1, R2, R3, Y, Z or G2 when n is 4;
• and when any one of R1, R2, R3, Y and G2 represents a 5- to 8-membered saturated or unsaturated heterocyclic ring, the ring is a monocyclic ring or a condensed ring).