147-14-8

Description

The essential blue pigment Copper(II) phthalocyanine is a tetraazatetrabenzoporphin. It has a four-fold axis of symmetry in common with the porphin system and has two absorption bands in or close to the visible region, designated Q-bands and B-bands. It sublimes without decomposition at 550–580 °C and dissolves in conc. H2SO4 and the original colour are restored on dilution. Sulphonation of copper phthalocyanine converts it into water-soluble direct dye. Copper(II) phthalocyanine approximates the ideal pigment, finding use throughout the pigment-consuming marketplace worldwide. It is a pigment that offers brightness, cleanliness, strength and economy with all-round excellent performance as a colour. Specific highly purified grades of copper phthalocyanine, purified to remove free copper, are used in dissolvable sutures and soft contact lenses.