ESR Spectra of Solid Phthalocyanines

Abstract
Phthalocyanine complexes of paramagnetic metal ions show ESR spectra characteristic of the metals; phthalocyanine complexes of diamagnetic metal ions show strong single ESR lines characteristic of free radicals. The source of this latter resonance is not understood. Intimate molecular mixtures of ``paramagnetic'' copper and ``dimagnetic'' zinc phthalocyanines exhibit exchange between the copper unpaired electron and the ``free radical'' electron in the zinc phthalocyanine. Nickel and zinc phthalocyanine also exhibit a single sharp resonance in dilute solutions of concentrated sulfuric acid.

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