Spectra and Photoconduction of Phthalocyanine Complexes (I)

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Abstract
Reflection spectra of Co, Ni,Cu,Zn, and metal‐free phthalocyanines have been measured. The Davydov splitting of the main absorption peak in the metal compounds correlates with the relative tendencies of the metals to out‐of‐plane bonding. Photoconduction response curves have been measured between 1500 and 300 mμ for single crystals of these compounds. Besides a high response following the crystal absorption, metal‐free Ni and Cu phthalocyanines also had considerable photosensitivity in the near infrared, peaking at 900–1100 mμ. The effect on the short‐wavelength photoconduction of measuring in vacuo instead of in air also correlates with the ability of the metals to bond out‐of‐plane groups.