Phthalocyanine OPCs

In the ten years that followed after the expiration of the basic application patent of Xerox , very photosensitive phthalocyanine compounds were developed and phthalocyanine OPCs became the leading materials for this application. 

Behavior of metal complexes of phthalocyanines in supramolecular systems with TX-lOO (Fig. 13.8) is very different from other systems of micellar carriers. Tetra-substituted ZrL Pc, as in other supramolecular systems, has an absorption band with a wavelength of 678 nm corresponding to monomeric of molecules in the micelles. In micellar solutions of SiCl Pc absorption maximum at wavelength of 676 nm is observed only, indicating a completely isolated metal complex in this conditions. Unlike other systems, V=OPc has a well-defined absorption band at 678 mn, which corresponds to the presence of monomers in the system, the band bathochromic shifted to 830 nm, which corresponds to J-aggregates and the absorption band hypsochromic shifted to 630 nm, which corresponds to H-aggregates. Hence, V=OPc molecules interaction with TX-lOO micelles form three different type aggregation states of the molecules. 

Of these 70 million OPC photoreceptors, 45 million were by Canon, 10 million by Mitsubishi Chemicals, 4 million by Fuji Electric, 3 million each by Yamanashi Electronics and Dainippon Ink and Chemicals, and 5 million by others. The largest fraction of these OPC photoreceptors were based upon titanyl phthalocyanines. 

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. 

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