A New Synthesis of ε-Form Nickel Phthalocyanine by Using DBU at Low Temperature

A new crystal named ε-form nickel phthalocyanine(NiPc), has been synthesized from NiCl2 and phthalonitrile by using 1,8-diaza-bicyclo(5,4,0)undecene-7(DBU) in 2-butoxyethanol at 100 °C. The X-ray powder diffraction pattern of ε-NiPc was distinguishable from other polymorphs. The IR and electronic absorption spectra suggest that this ε-NiPc forms a new crystal phase of an intermediate atate.