Abstract: A fused polycyclic aromatic compound represented by formula (1) is provided. In formula (1), one of R1 and R2 is a substituent group represented by general formula (2). In formula (2), n is from 0 to 2, R3 and R4 each independently represent a divalent linking group obtained by removing two hydrogen atoms from an aromatic hydrocarbon compound or a divalent linking group obtained by removing two hydrogen atoms from a 6-membered or more heterocyclic compound containing a nitrogen atom, an oxygen atom or a sulfur atom, with a plurality of R4 groups able to be the same as or different from each other when n is 2, and R5 represents a residue obtained by removing one hydrogen atom from an aromatic hydrocarbon compound or a residue obtained by removing one hydrogen atom from a 6-membered or more heterocyclic compound containing a nitrogen atom, an oxygen atom or a sulfur atom.

Abstract: The present invention includes a fused polycyclic aromatic compound represented by general formula (1), where in formula (1), one among R1 and R2 is represented by general formula (2) and represents a substituent having three to five ring structures, and the other among R1 and R2 represents a hydrogen atom, where in formula (2), n represents an integer of 0-2R. —R3 represents a divalent linking group obtained by removing two hydrogen atoms from benzene or naphthalene, R4 represents a divalent linking group obtained by removing two hydrogen atoms from an aromatic ring of an aromatic hydrocarbon, and when n is 2, a plurality of R4's may be the same as or different from each other, R5 represents an aromatic hydrocarbon group.

Abstract: A compound represented by formula (1) or a salt thereof, and an ink including the same.

Abstract: A compound represented by formula (1) or a salt thereof, and an ink including the same.

Abstract: An azo compound and an ink composition containing the azo compound are used as inks for ink jet recording and have excellent gas (ozone) resistance when recording is done on special ink jet paper. The azo compound is represented by formula (1) or a tautomer thereof, or a salt of these. In formula (1), R1 represents a C1-C4 alkyl group, R2 represents a cyano group, R3 and R4 each independently represent a C1-C4 alkoxy, R5-R10 each independently represent a group represented by formula (2), and R11-R13 each independently represent a nitro group.

Abstract: An azo compound and an ink composition containing the azo compound are used as inks for ink jet recording and have excellent gas (ozone) resistance when recording is done on special ink jet paper. The azo compound is represented by formula (1) or a tautomer thereof, or a salt of these. In formula (1), R1 represents a C1-C4 alkyl group, R2 represents a cyano group, R3 and R4 each independently represent a C1-C4 alkoxy, R5-R10 each independently represent a group represented by formula (2), and R11-R13 each independently represent a nitro group.