Exciplex Formation and Electrochemiluminescence

When a solution of Pt2(pop)4 is subjected to alternating current electrolysis with variable frequency, the 514-nm luminescence is observed at one electrode. This observation of chemiluminescence has been explained by the generation of triplet Pt2(pop)4 from the electron transfer reaction between electrochemically generated Pt2(pop)4 and Pt2(pop)4 [Eq. 4.16)].  

Electrochemiluminescence has, however, also been observed in Pt2(pop)4 solutions containing Bu4N under experimental conditions where only reducing conditions are used. This result has been explained on the assumption that Pt2(pop)4 is generated by the reaction of butyl radicals with Pt2(pop)4 /  

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