Photoreduction of the paraquat dication (1, 1′-dimethyl-4, 4′-bipyridinium) by visible light via its charge transfer complex with a dithioanion

A Deronzier

Index: Deronzier, Alain Journal of the Chemical Society, Chemical Communications, 1982 , # 6 p. 329 - 331

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Abstract

Photoreduction by visible light of 1,l '-dimethyl-4,4'-bipyri- dinium salts (paraquat, PQ”) into the corresponding cation radical PQ*+ which is a mild reducing agent, is currently achieved in the presence of a photosensitizer such as R~(bpy),~+ or Zn(TPP) (bpy = 2,2'-bipyridine; TPP = tetraphenylporphyrin) and an irreversible electron donor. This system has been used extensively for photoredox catalysis, especially for the photoreduction of water? We report here a new ...