Titanyl crystal modifications

Although titanyl phthalocyanine is known to have two crystal forms (alpha and beta), in the course of OPC investigations over the past fifteen years, many new crystal modifications were discovered, exhibiting different patterns of X-ray diffraction spectra. 

The shape of the titanyl phthalocyanine molecule is not planar but pyramidal, where the titanium atom is out of the plane of the phthalocyanine macrocycle and the symmetry of the molecule is reduced from D4h to C4h. Accordingly, titanyl phthalocyanines can have more crystal modifications than such planar molecules as copper phthalocyanine or metal-free phthalocyanine. General procedures used in the development of new crystal modifications involve solvent treatment of amorphous titanyl phthalocyanines obtained by acid pasting or milling procedures. 

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See also in sourсe #XX -- [ ]

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