127399-11-5Relevant academic research and scientific papers
Synthesis and investigation of donor-porphyrin-acceptor triads with long-lived photo-induced charge-separate states
Kelber, Julien B.,Panjwani, Naitik A.,Wu, Di,Gómez-Bombarelli, Rafael,Lovett, Brendon W.,Morton, John J. L.,Anderson, Harry L.
, p. 6468 - 6481 (2015/10/28)
Two donor-porphyrin-acceptor triads have been synthesized using a versatile Suzuki-coupling route. This synthetic strategy allows the powerful donor tetraalkylphenylenediamine (TAPD) to be introduced into tetraarylporphyrin-based triads without protection. The thermodynamics and kinetics of electron transfer in the new triads are compared with a previously reported octaalkyldiphenyl-porphyrin triad exhibiting a long-lived spin-polarized charge separate state (CSS), from theoretical and experimental perspectives, in both fluid solution and in a frozen solvent glass. We show that the less favorable oxidation potential of the tetraaryl-porphyrin core can be offset by using C60, as a better electron-acceptor than triptycenenaphthoquinone (TNQ). The C60-porphyrin-TAPD triad gives a spin-polarized charge-separated state that can be observed by EPR-spectroscopy, with a mean lifetime of 16 ms at 10 K, which is longer than in the previously reported TNQ-porphyrin-TAPD triad, following the predicted trend from calculated charge-recombination rates.
SPIN-POLARIZED RADICAL ION PAIR FORMATION RESULTING FROM TWO-STEP ELECTRON TRANSFER FROM THE LOWEST EXCITED SINGLET STATE OF A FIXED-DISTANCE PHOTOSYNTHETIC MODEL SYSTEM AT 5 K.
Wasielewski, Michael R.,Gaines, George L.,O'Neil, Michael P.,Svec, Walter A.,Niemczyk, Mark P.
, p. 201 - 208 (2007/10/02)
A photosynthetic reaction center model consisting of a zinc porphyrin primary electron donor, ZP, positioned between a naphthoquinone electron acceptor, NQ, and an N,N,N,N-tetraalkyl-p-phenylenediamine secondary electron donor, TAPD, was synthesized.The r
