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Structures of Copper Phthalocyanine Crystals Grown in Inert Gases

Abstract Crystallization process of copper phathalocyanine was studied in inert gases by sublimation. Near the sublimation source, crystalline particles of the α-form is grown, and they change into ribbon-like crystals as increasing the height from the sublimation source. The crystal structure of smaller ribbon-like crystals is the α-form, and transforms into the β-form with increasing the height. The same structural changes were also observed by increasing the gas pressure. The structure change from the α- to β-form happened at low height and low gas pressure, when the inert gas with large atomic number is used.