| abstract |
An azo dye including a compound represented by formula (I):n nwherein R 1 represents a hydroxyl group, an aliphatic sulfonyl amino group, an aryl sulfonyl amino group, an aliphatic oxy group, an aryloxy group, or -CH(R 2 )(R 3 ); R 2 and R 3 each represent a substituent with a a value of the Hammett's rule in the range of 0.2 or more and less than 1.4, and may be identical to or different from each other; W represents a sulfur atom or -N-(-R 4 )-; R 4 represents a substituent; R 5 represents a substituent; X, Y, and Z each represent an atom required for forming a five-membered aromatic heterocycle, where at least one atom of X, Y, and Z represents a nitrogen atom but both X and Y do not represent a carbon atom when Z represents a nitrogen atom; and R 6 represents a hydrogen atom or a substituent, n represents 1 or 2, and two R 6 s may be coupled together to form an aromatic ring or a heteroaromatic ring when n represents 2. |