Palladium phthalocyanine and its polymorphic forms

Abstract

Pd(II) phthalocyanine (PdPc) was obtained by reaction of PdCl2 with phthalimide and urea in the presence of ammonium molybdate in boiling nitrobenzene, resulting in a good yield equal to 68%. This method has not been used previously. The following polymorphic forms were obtained: metastable α- and γ-PdPc, not previous described in the literature, and stable β-PdPc. The IR spectra and X-ray powder diffraction spectra of these phases were measured and interpreted. The results were compared with the literature data on polymorphic forms of other phthalocyanines. At this time we do not know if any of the PdPc polymorphs are isomorphous with the various forms of nickel, copper, and platinum phthalocyanine.