Origin of the electron spin resonance signal in diamagnetic phthalocyanins

Abstract
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.

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