Phthalocyanine green pigments

Robert Christie, Adrian Abel

Research output: Contribution to journalArticlepeer-review

Abstract

The dominant organic green pigments are polyhalogenated copper phthalocyanines (CuPcs). These pigments exhibit similar excellent coloristic and technical performance to CuPc blue pigments and are produced worldwide in large quantities. The green pigments are halogenated CuPcs. There are two pigments with CI designations. CI Pigment Green 7 is a bluish green product, in which the 16 ring hydrogen atoms of the CuPc molecule are replaced virtually completely by chlorine. Products designated as CI Pigment Green 36 incorporate a range of bromo-and bromochlorocopper phthalocyanines and are yellowish-green pigments. CuPc green pigments are manufactured by direct exhaustive halogenation of crude CuPc blue with chlorine or bromine or an appropriate mixture of the two halogens, depending on the composition of the product required. The synthesis is carried out at elevated temperatures in a suitable solvent, commonly a molten AlCl3/NaCl eutectic mixture.

Original languageEnglish
JournalPhysical Sciences Reviews
DOIs
Publication statusE-pub ahead of print - 29 Jun 2021

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Physics and Astronomy(all)

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