Mechanistic Study of Electron Spin Polarization Transfer in Covalent Donor–Acceptor-Radical Systems

Yuheng Huang, Matthew D. Krzyaniak, Ryan M. Young, Michael R. Wasielewski*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The mechanism of spin polarization transfer from a photogenerated spin-correlated radical pair to a stable radical was studied in a covalent donor-chromophore-acceptor-stable radical (D-C-A-R) system, where the donor (D) is 4-methoxyaniline (MeOAn), the chromophore (C) is 4-(N-piperidinyl)-naphthalene-1,8-dicarboximide (ANI), the acceptor (A) is naphthalene-1,8:4,5-bis(dicarboximide) (NDI) and the stable radical (R) is (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO). Experiments probed the effect of the spin–spin exchange interaction between D•+ and A•− as well as the charge recombination dynamics of D•+-C-A•− on spin polarization transfer from the D•+-C-A•− SCRP to R as a function of the dielectric environment in glassy media at cryogenic temperatures. The results show that spin polarization on R is generated by asymmetry in the charge recombination pathways rather than variations in the spin–spin exchange interaction between D•+ and A•−. These results inform design criteria for using an SCRP to spin polarize a third spin for potential applications in quantum information science.

Original languageEnglish (US)
JournalApplied Magnetic Resonance
DOIs
StateAccepted/In press - 2021

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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