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Circular Photoinduced Electron Transfer in a Donor‐Acceptor‐Acceptor Triad
Author(s) -
Larsen Christopher B.,
Wenger Oliver S.
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201708207
Subject(s) - photoexcitation , triad (sociology) , acceptor , charge (physics) , electron transfer , photochemistry , chemistry , electron acceptor , materials science , atomic physics , molecular physics , physics , excited state , condensed matter physics , psychology , quantum mechanics , psychoanalysis
An electron‐donor‐acceptor‐acceptor (D‐A 1 ‐A 2 ) 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 A 1 , subsequent thermal electron‐transfer from A 1 .− to A 2 is followed by geometric rearrangement in the D .+ ‐A 1 ‐A 2 .− charge‐separated state to form an ion‐pair contact. This facilitates “forward” charge recombination between A 2 .− and D .+ to complete the molecular circuit with an estimated quantum efficiency of 4 % in toluene at 298 K.