Crystal Phase Study of Pigment Red 254 in the Presence of Ionic Liquids

Polymorphism is difined as different crystalline phases with the same chemical structure. diketopyrrolopyrrole (dpp) derivatives, as the innovative heterocyclic pigments, follow this pattern and most of times exist in two crystalline forms of alpha and beta with various application in different industries. herein, synthesis of 3, 6-bis (4-chlorophenyl) -2, 5- dihydropyrrolo [3,4-c] pyrrole-1,4-dione called pigment red 254 (pr 254) with selected crystalline phase using ionic liquids was achieved without any further need to conventional methods for crystalline phase separation after synthesis. observed different physical properties such as melting points and color properties of the obtained pigment (pr 254 in / and 0 crystalline phases) are clarified.prog. color colorants coat. 5(2012), 1-6. © institute for color science and technology.