IR absorbing phthalocyanines

摘要

Novel sulphur-containing phthalocyanines claimed for use in IR absorption are of formula (I), optionally with both N-bonded H replaced by Cu, Ni, vanadyl, Mg, AlCl or Zn.A = a group of formula (IA) or (IB); B and C = rings optionally substituted by 1-4C alkyl or alkoxy, NO2, hydroxy- sulphonyl or benzoyl or optionally condensed with a benzene ring; and R = H or methyl.