Detailed analysis of the e.s.r. signal observed in some diamagnetic phthalocyanins and metal-free tetraphenylporphyrin suggests that the cause is various charge-transfer interactions between phthalocyanin or porphyrin cations and dioxygen anions stabilised by the surface of the diamagnetic host.
J. B. Raynor, M. Robson and A. S. M. Torrens-Burton, J. Chem. Soc., Dalton Trans., 1977, 2360 DOI: 10.1039/DT9770002360
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