Pyrazoloazoleazomethine dyes.

摘要

A pyrazoloazoleazomethine dye represented by formula (I) <CHEM> wherein R1, represents a substituent having a Hammett's substituent constant value of at least 0.6; Za, Zb, and Zc each represents =CH-, = @@ (wherein R2 represents a hydrogen atom or a substituent), or =N-; when Zc=Zb is a carbon-carbon double bond, it may form a part of an aromatic ring; R3, R4, and R5 each represents a hydrogen atom or a substituent; and n represents 1 or 2; said dye may form a dimer or higher polymer by combining with each other or to a polymer through a divalent or higher valent group at R1, Za, Zb, or Zc.