Citation: Qingjun PAN, Zhongliang GONG, Yuwu ZHONG. Advances in modulation of the excited states of photofunctional iron complexes[J]. Chinese Journal of Inorganic Chemistry, ;2025, 41(1): 45-58. doi: 10.11862/CJIC.20240365 shu

Advances in modulation of the excited states of photofunctional iron complexes

Qingjun PAN ^{1, 2} ,
Zhongliang GONG ¹ ,
Yuwu ZHONG ^{1, 2,,}

1.
Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Photochemistry, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
2.
School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: Yuwu ZHONG, zhongyuwu@iccas.ac.cn
Received Date: 11 October 2024
Revised Date: 30 November 2024

Figures(11)

Abstracts: Many second and third-row transition-metal complexes with d⁶ and d⁸ electronic configurations possess long-lived metal-to-ligand charge-transfer (MLCT) excited states, endowing them with excellent photochemical and photophysical properties. However, these metals are typically expensive and have a low abundance in the earth′s crust. Therefore, it is significant to develop inexpensive and high earth-abundant first-row transition-metal complexes as new photo-functional materials. Among them, Fe(Ⅱ) complexes with a 3d⁶ electronic configuration and Fe(Ⅲ) complexes with a 3d⁵ electronic configuration are the subject of particular interest. The main challenges are to modulate the MLCT excited state of Fe(Ⅱ) complexes through efficient ligand design and to achieve the ligand-to-metal charge transfer (LMCT) luminescence of Fe(Ⅲ) complexes. In recent years, significant progress were made in the studies of Fe(Ⅱ) complexes with relatively long MLCT excited-state lifetimes and Fe(Ⅲ) complexes with efficient LMCT luminescence. These complexes have been successfully applied in different aspects of photochemistry. This review summarizes the recent advances in modulating the excited-state properties of photofunctional Fe(Ⅱ) and Fe(Ⅲ) complexes, focusing on the molecular designs of metal complexes and ligands. In addition, the potential developments and applications in the photochemistry of Fe(Ⅱ)/Fe(Ⅲ) complexes are discussed.
- earth-abundant metal,
- iron complex,
- ligand design,
- modulation of excited state
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