Azo compounds, azo pigments, and dispersion, coloring composition and ink for inkjet recording containing the azo compounds or azo pigments, ink tank for inkjet recording, inkjet recording method, and recorded products

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

• wherein R′1, R′2, and Y′ each independently represents a hydrogen atom, a straight or branched alkyl group containing from 1 to 4 carbon atoms, an alkenyl group containing from 2 to 4 carbon atoms, an alkynyl group containing from 2 to 4 carbon atoms, an acyl group containing from 1 to 5 carbon atoms, an aralkyl group containing from 7 to 9 carbon atoms, 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 σp value of 0.2 or more;
• X represents a hetero atom adjacent to the carbon atom;
• G1 represents atoms necessary for forming a 5- to 8-membered, saturated or unsaturated heterocyclic ring;
• when any one of R′1, R′2, Y′, and G1 represents a 5- to 8-membered, saturated or unsaturated heterocyclic ring, it represents 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, it has two or more nitrogen atoms within the ring.

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

• wherein R′1, R′2, and Y′ each independently represents a hydrogen atom, a straight or branched alkyl group containing from 1 to 4 carbon atoms, an alkenyl group containing from 2 to 4 carbon atoms, an alkynyl group containing from 2 to 4 carbon atoms, an acyl group containing from 1 to 5 carbon atoms, an aralkyl group containing from 7 to 9 carbon atoms, 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 σp value of 0.2 or more;
• X represents a hetero atom adjacent to the carbon atom;
• G1 represents atoms necessary for forming a 5- to 8-membered, saturated or unsaturated heterocyclic ring;
• when any one of R′1, R′2, Y′, and G1 represents a 5- to 8-membered, saturated or unsaturated heterocyclic ring, it represents 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, it has two or more nitrogen atoms within the ring.

An azo compound represented by the following general 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 hetero atom adjacent to the carbon atom, G2 represents atoms necessary for forming a 5- to 8-membered, saturated or unsaturated heterocyclic ring;
• when n=2, the general formula (4) represents a dimer formed through R1, R2, R3, Y, Z, or G2;
• when n=3, the general formula (4) represents a trimer formed through R1, R2, R3, Y, Z, or G2;
• when n=4, the general formula (4) represents a tetramer formed through R1, R2, R3, Y, Z, or G2;
• and
• when any one of R1, R2, R3, Y, Z and G2 represents a 5- to 8-membered, saturated or unsaturated heterocyclic ring, it represents a monocyclic ring or a condensed ring.