Synthesis of New Polymorphs of μ-Oxo-meta(III) Phthalocyanine Dimers and Their Photoconductive Properties

Abstract

The titled p-oxo-metal(III) phthalocyanine dimers were prepared and investigated their polymorphs through X-ray diffraction analysis. It was found that μ-oxo-aluminum phthalocyanine dimer and, μ-oxo-gallium phthalocyanine dimer have several polymorphs, but one of the target compounds, that is μ-oxo-indium phthalocyanine dimer, could not be synthesized because chloroindium phthalocyanine was easily hydrolyzed through acid-pasting treatment procedure to give metal-free phthalocyanine. The characterization of these compounds by the several chemical analytical methods was satisfied for the target molecules and the FD-Mass analysis distinguished clearly between the hydroxymetal phthalocyanine and the corresponding phthalocyanine dimer. We also studied their photoconductive properties on the bilayer photoreceptor consisted of the above phthalocyanine dimer as the charge generating material. It was found that the specific polymorphs of μ-oxo-metal(III) phthalocyanine dimers have good photoconductive properties: the APL- II (the II type of μ-oxo-Al(III) phthalocyanine dimer discussed in this article) has a good spectral response of the photosensitivity in the shorter wavelength, and the GPL-G (the G type of μ-oxo-Ga (III) phthalocyanine dimer discussed in this article) has a fairly high photosensitivity in the wavelength region of laser diode light wavelength, compared with the common phthalocyanine photoreceptors.