A linear Di-coordinate boron radical cation

Yu-Jiang Lin, Wei-Chun Liu, Yi-Hung Liu, Gene-Hsiang Lee, Su-Ying Chien and Ching-Wen Chiu ()
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Yu-Jiang Lin: National Taiwan University
Wei-Chun Liu: National Taiwan University
Yi-Hung Liu: National Taiwan University
Gene-Hsiang Lee: National Taiwan University
Su-Ying Chien: National Taiwan University
Ching-Wen Chiu: National Taiwan University

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract The pursuit of di-coordinate boron radical has been continued for more than a half century, and their stabilization and structural characterization remains a challenge. Here we report the isolation and structural characterization of a linear di-coordinate boron radical cation, achieved by stabilizing the two reactive atomic orbitals of the central boron atom by two orthogonal π-donating and π-accepting functionalities. The electron deficient radical cation undergoes facile one-electron reduction to borylene and binds Lewis base to give heteroleptic tri-coordinate boron radical cation. The co-existence of half-filled and empty p orbitals at boron also allows the CO-regulated electron transfer to be explored. As the introduction of CO promotes the electron transfer from a tri-coordinate neutral boron radical to a boron radical cation, the removal of CO under vacuum furnishes the reverse electron transfer from borylene to yield a solution consisting of two boron radicals.

Date: 2022
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DOI: 10.1038/s41467-022-34900-7

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