Fluorescent pyridine phosphonium salts via transmutation of metallabenzenes

Yaowei Zhang, Feifei Han, Zhihong Yin, Yapeng Cai, Xiaoyan Zhang and Hong Zhang ()
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Yaowei Zhang: Xiamen University
Feifei Han: Dalian University of Technology
Zhihong Yin: Xiamen University
Yapeng Cai: Xiamen University
Xiaoyan Zhang: Xiamen University
Hong Zhang: Xiamen University

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: Abstract Metallabenzenes are recognized as a unique class of aromatic compounds, not only of structural and theoretical interest but also as platforms to design powerful transformations. Here, we report the successful transmutation of a metallabenzene for pyridine synthesis. This ‘metal-to-nitrogen swapping’ process utilizes readily available ruthenabenzene phosphonium salts and commercially available 2-aminopyridines under mild conditions. The isolation of ruthena-azepines, containing a planar seven-membered aza-metallacycle, along with DFT calculations, supports the nitrogen insertion/metal deletion cascade driven by aromatization. Additionally, we investigate the tunable photophysical properties of the resulting pyridine phosphonium salts.

Date: 2025
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DOI: 10.1038/s41467-025-58855-7

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