Reduction of Li+ within a borate anion

Haokun Li, Jiachen Yao, Gan Xu, Shek-Man Yiu, Chi-Kit Siu, Zhen Wang, Yung-Kang Peng, Yi Xie, Ying Wang and Zhenpin Lu ()
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Haokun Li: City University of Hong Kong, Kowloon Tong
Jiachen Yao: City University of Hong Kong, Kowloon Tong
Gan Xu: City University of Hong Kong, Kowloon Tong
Shek-Man Yiu: City University of Hong Kong, Kowloon Tong
Chi-Kit Siu: City University of Hong Kong, Kowloon Tong
Zhen Wang: City University of Hong Kong, Kowloon Tong
Yung-Kang Peng: City University of Hong Kong, Kowloon Tong
Yi Xie: The Chinese University of Hong Kong, Shatin
Ying Wang: The Chinese University of Hong Kong, Shatin
Zhenpin Lu: City University of Hong Kong, Kowloon Tong

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Group 1 elements exhibit the lowest electronegativity values in the Periodic Table. The chemical reduction of Group 1 metal cations M+ to M(0) is extremely challenging. Common tetraaryl borates demonstrate limited redox properties and are prone to decomposition upon oxidation. In this study, by employing simple yet versatile bipyridines as ligands, we synthesized a series of redox-active borate anions characterized by NMR and X-ray single-crystal diffraction. Notably, the borate anion can realize the reduction of Li+, generating elemental lithium metal and boron radical, thereby demonstrating its potent reducing ability. Furthermore, it can serve as a powerful two-electron-reducing reagent and be readily applied in various reductive homo-coupling reactions and Birch reduction of acridine. Additionally, this borate anion demonstrates its catalytic ability in the selective two-electron reduction of CO2 into CO.

Date: 2024
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DOI: 10.1038/s41467-024-46948-8

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