Synthesis and properties of perylene pigments

Perylene pigments have been used as pigments and recently, there have been several new developments as functional dyes. In this review synthesis of perylene pigments, such compounds as symmetrically or unsymmetrically substituted perylenebis(dicarboximide)s and perylenetetracarboxylic monoanhydride monoimides, and their properties are described. Unsymmetrically substituted perylene pigments are prepared by the condensation of perylenetetracarboxylic monoanhydride monoimides with primary amines. Most solid perylene pigments are red and form a red purple solution in organic solvents with an intense yellow fluorescence. Perylene pigments are very stable thermally together with photo stability and have several kind of electrical properties.