Modulating Electron Transfer in an Organic Reaction via Chemical Group Modification of the Photocatalyst

Ran Liu (1) , Li Yang (2) , Tongtong Yang (1) , Yan Huang (1) , Mario Barbatti (3) , Jun Jiang (1) , Guozhen Zhang (1)

1 USTC - University of Science and Technology of China [Hefei]
2 Anhui University [Hefei]
3 ICR - Institut de Chimie Radicalaire

Tuning electron transfer (ET) rates from catalysts to substrates is important for modulating photocatalytic organic reactions. In this work, we have taken pyrene-based photocatalysts (Py) for photocatalytic hydrodefluorination of polyfluoroarenes (FA) as model systems, and conducted a first-principle study on modulating ET rates from Py to FA via chemical modification of Py with different electron donating/withdrawing groups (EDGs/EWGs). The computed spatial distributions of frontier Kohn-Sham orbitals suggest that ET is energetically more favorable for Py-EDGs than for Py-EWGs. The estimated ET rates by a simplified Marcus model show that they are appreciably enhanced by EDGs substitution and weakened by EWGs substitution. Noticeably, the associated Gibbs free energy change plays a dominant role. Our findings of tuning ET rates for Py-FA complexes via chemical group modifications cast new insight into the rational design of metal-free photocatalysts for organic transformations. TOC Graphic

Domaines: Chimie

Ran Liu, Li Yang, Tongtong Yang, Yan Huang, Mario Barbatti, et al.. Modulating Electron Transfer in an Organic Reaction via Chemical Group Modification of the Photocatalyst. Journal of Physical Chemistry Letters, 2019, pp.5634-5639. ⟨10.1021/acs.jpclett.9b01970⟩. ⟨hal-02288619⟩