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Title: Anti-Arrhenius behavior of electron transfer reactions in molecular dimers

Journal Article · · Chemical Science
DOI: https://doi.org/10.1039/d3sc03609j · OSTI ID:2281332
ORCiD logo [1]; ORCiD logo [2]
  1. Univ. of Connecticut, Storrs, CT (United States)
  2. Univ. of Connecticut, Storrs, CT (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)

Rates of chemical reactions typically accelerate as the temperature rises, following the Arrhenius law. However, electron transfer reactions may exhibit weak temperature dependence or counterintuitive behavior, known as anti-Arrhenius behavior, wherein reaction rates decrease as temperature increases. Solvent reorganization energy and torsion-induced changes in electronic couplings could contribute to this unusual behavior, but how each contributes to the overall temperature dependence is unclear. One can decelerate the charge recombination process in photogenerated radical pairs or charge-separated states by harnessing this often-overlooked phenomenon. This means that we could achieve long-lived radical pairs without relying on conventional cooling. Using a series of homo molecular dimers, we showed that the degree of torsional hindrance dictates temperature-dependent torsion-induced changes in electronic coupling and, therefore, charge recombination rates. The overall temperature dependence is controlled by how changes in electronic coupling and the temperature-dependent solvent reorganization energy contribute to the rates of charge recombination. Our findings pave the way for rationally designing molecules that exhibit anti-Arrhenius behavior to slow down charge recombination, opening possibilities for applications in energy-related and quantum information technologies.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
SC0012704
OSTI ID:
2281332
Report Number(s):
BNL--225164-2024-JAAM
Journal Information:
Chemical Science, Journal Name: Chemical Science Journal Issue: 45 Vol. 14; ISSN 2041-6520
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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