金属フタロシアニンの光伝導（Ⅰ）電気伝導および光伝導におよぽす配位金属の影響

抄録

The basic study of the effect of coordinated metal on electrical and photoconductive properties of metal phthalocyanines where metal = Cu, Fe, Co, Ni, Mn, Zn, and VO, was carried out. Absorption maximum in 650-700nm is due to charge transfer from metal to nitrogen in ligands. The charge transfer absorption bands of metal phthalocyanines are shifted to lower wavelength region as the reciprocal of ionic radius.
As the ionic radius of the coordinated metal decrease, the stability of these metal complexes increase. These results were in fair agreement with the order of the stability constant of the coordinated metal in Irving-Williams.
The SnO₂/MPc/metal cell containing sample sandwiched between transparent electrode and silver electrode have been prepared, and their photoelectrical properties studied in high vacuum. Photovoltaic effect was showed strongly in low field region. Activation energies (Ea) for electric conduction between 0.30eV and 1.04eV were measured, there being a definite correlation between log σ₀ (pre-exponential factor) and Ea. It was shown that the compensation effect arises from calculation of σ₀ and Ea. CoPc has a marked photoconduction in the red region (ca. 1300nm) where the intensity of the optical absorption is feeble.