Issue 33, 2024

Deciphering charge transfer dynamics of a lead halide perovskite–nickel(ii) complex for visible light photoredox C–N coupling

Abstract

Photoredox catalysis involving perovskite quantum dots (QDs) has gained enormous attention because of their high efficiency and selectivity. In this study, we have demonstrated CsPbBr3 QDs as photocatalysts for the C–N bond formation reaction. The introduction of Ni(dmgH)2 (dmgH = dimethyl glyoximato) as a cocatalyst with CsPbBr3 QDs facilitates photocatalytic C–N coupling to form a wide variety of amides. The optimized interaction between the cocatalyst and photocatalyst enhances charge transfer and mitigates charge recombination, ultimately boosting photocatalytic performance. The photocatalytic activity is notably influenced by the variation in the amount of cocatalyst and 7 wt% Ni(dmgH)2 produces the best yield (92%) of amide. Femtosecond transient absorption spectroscopy reveals that the dynamics of the trap states of QDs are affected by cocatalyst. Further, Ni(dmgH)2 facilitates molecular oxygen activation to form superoxide radicals, which further initiates the radical pathway for the C–N coupling.

Graphical abstract: Deciphering charge transfer dynamics of a lead halide perovskite–nickel(ii) complex for visible light photoredox C–N coupling

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Article information

Article type
Edge Article
Submitted
08 May 2024
Accepted
17 Jul 2024
First published
25 Jul 2024
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2024,15, 13218-13226

Deciphering charge transfer dynamics of a lead halide perovskite–nickel(II) complex for visible light photoredox C–N coupling

V. Kumar, S. K. Patel, V. Vyas, D. Kumar, E. S. Subramaniam Iyer and A. Indra, Chem. Sci., 2024, 15, 13218 DOI: 10.1039/D4SC03023K

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