Quenching of Phosphorescence by Paramagnetic Molecules in Rigid Media. II. Quenching of Perdeuderated Naphthalene by Co++, Cr3+, Cu++, and Ni++

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Abstract
Experimental observation of the steady‐state phosphorescence emission intensity of perdeuterated naphthalene as a function of paramagnetic quencher concentrations has been carried out in solid matrices of ethyl alcohol at liquid‐nitrogen temperature. The paramagnetic quenchers chosen for study are the transition‐metal ions, Co++, Cr3+, Cu++, and Ni++. The decay curves of phosphorescence are non‐exponential, and the deviation from the exponentiality depends on the concentrations of quenchers. The experimental results are correlated and interpreted by using theoretical expressions derived from the Hoijtink's exchange interaction mechanism.

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