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Circular Photoinduced Electron Transfer in a Donor‐Acceptor‐Acceptor Triad
Authors:Dr. Christopher B. Larsen  Prof. Dr. Oliver S. Wenger
Affiliation:Department of Chemistry, University of Basel, Basel, Switzerland
Abstract:An electron‐donor‐acceptor‐acceptor (D‐A1‐A2) triad has been developed that provides the first proof‐of‐concept for a photoinitiated molecular circuit. After photoexcitation into an optical charge‐transfer transition between D and A1, subsequent thermal electron‐transfer from A1.? to A2 is followed by geometric rearrangement in the D.+‐A1‐A2.? charge‐separated state to form an ion‐pair contact. This facilitates “forward” charge recombination between A2.? and D.+ to complete the molecular circuit with an estimated quantum efficiency of 4 % in toluene at 298 K.
Keywords:charge transfer  donor–  acceptor systems  electron transfer  ion pairs  time-resolved spectroscopy
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