Novel azo dye compound

摘要

A compound represented by formula (I): Formula (I) wherein Z₁ is atoms necessary for forming an aromatic ring; Z₂ is atoms necessary for forming an aromatic hetero ring; V₁ and V₂ each are a substituent, and at least one of V₁ and V₂ is a hydroxyl, primary- or secondary- or tertiary-amino, acylamino, or sulfonamido group; r is 1 to 4; s is 1 to 4; the ring formed by Z₁ or Z₂ may have a substituent other than V₁ or V₂; M₁ is a counter ion; m₁ is the number necessary for neutralizing charge; and X₁ and X₂ each are a carbon or hetero atom, and at least one of X₁ and X₂ is a hetero atom.