Switchable photoreduction pathways of antimony(V) tetraphenylporphyrin. A potential multielectron transfer photosensitizer
Abstract
Photoreduction of [SbV(tpp)(OH)2]+(tpp = dianion of 5,10,15,20-tetraphenylporphyrin) yields either the metastable π-radical anion [SbV(tpp˙–)(OH)2] or the two-electron reduced[SbIII(tpp)]+ complex; product formation can be channelled in the desired direction by an appropriate choice of the reaction medium and dioxygen regenerates the starting compound.