Spin Polarization Transfer from a Photogenerated Radical Ion Pair to a Stable Radical Controlled by Charge Recombination

The Journal of Physical Chemistry. a
Noah E HorwitzMichael R Wasielewski

Abstract

Photoexcitation of electron donor-acceptor molecules frequently produces radical ion pairs with well-defined initial spin-polarized states that have attracted significant interest for spintronics. Transfer of this initial spin polarization to a stable radical is predicted to depend on the rates of the radical ion pair recombination reactions, but this prediction has not been tested experimentally. In this study, a stable radical/electron donor/chromophore/electron acceptor molecule, BDPA•-mPD-ANI-NDI, where BDPA•is α,γ-bisdiphenylene-β-phenylallyl, mPD is m-phenylenediamine, ANI is 4-aminonaphthalene-1,8-dicarboximide, and NDI is naphthalene-1,4:5,8-bis(dicarboximide), was synthesized. Photoexcitation of ANI produces the triradical BDPA•-mPD+•-ANI-NDI-•in which the mPD+•-ANI-NDI-•radical ion pair is spin coupled to the BDPA•stable radical. BDPA•-mPD+•-ANI-NDI-•and its counterpart lacking the stable radical are found to exhibit spin-selective charge recombination in which the triplet radical ion pair3(mPD+•-ANI-NDI-•) is in equilibrium with the3*NDI charge recombination product. Time-resolved EPR measurements show that this process is associated with an inversion of the sign of the polarization transferred to BDPA•over time. The...Continue Reading

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May 27, 2015·The Journal of Physical Chemistry. B·Scott M DyarMichael R Wasielewski
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Apr 26, 2016·The Journal of Physical Chemistry. a·Noah E HorwitzMichael R Wasielewski

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Citations

Sep 4, 2019·Chemistry : a European Journal·Yoshio Teki
Oct 24, 2019·The Journal of Chemical Physics·Thomas P FayDavid E Manolopoulos
Feb 26, 2021·The Journal of Physical Chemistry Letters·Haochuan MaoMichael R Wasielewski
Mar 19, 2021·Journal of the American Chemical Society·Emmaline R LorenzoMichael R Wasielewski
Jun 15, 2021·Chemical Science·Aslam C ShaikhThomas L Gianetti
Nov 16, 2018·The Journal of Physical Chemistry. a·Jordan N NelsonMichael R Wasielewski
Sep 18, 2021·Journal of the American Chemical Society·Samantha M Harvey, Michael R Wasielewski

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