Copper phthalocyanine infrared absorption

Klug, H. P. and Alexander, L. E. (1974). X-ray diffraction procedures for polycrys-talline and amorphous materials. John Wiley Sons, New York. [117, 253, 254] Knudsen, B. 1. (1966). Copper phthalocyanine. Infrared absorption spectra of polymorphic modifications. Acta Chem. Scand., 20, 1344-50. 

Photoconductivity in copper phthalocyanine (III) now has been observed to occur with near-infrared light. Weak absorption of light in the near infrared by copper phthalocyanine has previously been observed. Although the ratio of extinction coefficients for visible and infrared light is 100 1, the ratio of the photoresponse peak heights (Fig. 7) is 3 1. This suggests that the... 

The optical properties of pigments in the near infrared were studied by Taylor Di Bernardo reported anomalous spectrophotometric behavior of copper phthalocyanine—benzidine yellow mixtures. Brode and Wyman presented the absorption spectra of ten thio-indigo dyes in benzene and chloroform and discussed the effect of irradiation upon their cis-trans equilibria they also presented the spectra of nine of these dyes in H2SO4 in the range 210-800 m/i. 

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