Effect of Pressure on the Low-Energy Absorption Peak of Several Phthalocyanines

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Abstract
The effect of pressure has been measured on the intense low energy absorption peak in nine phthalocyanines in the solid state. In all cases the peak shifted to lower energies. The shifts were not large, but were very sensitive to the metal ion in the phthalocyanine. In general, the amount of shift was greater for ions having larger polarizability. The shift is attributed to perturbation of the excited π electron state due to dispersion interaction with metal ions in adjacent molecules.
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