Carbon dioxide capture and functionalization by bis(N-heterocyclic carbene)-borylene complexes

Derivatives of free monocoordinated borylenes have attracted considerable interest due to their ability to exhibit transition-metal-like reactivity, in particular small molecules capture. However, such complexes are rare as the formation is either endergonic, or the resulting adduct is a transient i...

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Published inNature communications Vol. 15; no. 1; pp. 3052 - 9
Main Authors Fan, Jun, Koh, An-Ping, Wu, Chi-Shiun, Su, Ming-Der, So, Cheuk-Wai
Format Journal Article
LanguageEnglish
Published London Nature Publishing Group UK 09.04.2024
Nature Publishing Group
Nature Portfolio
Subjects
140/131
140/58
639/638/263/406
639/638/263/406/939
639/638/549/933
Adducts
Ammonia
Aniline
Boric acid
Boron
Carbenes
Carbon dioxide
Carbon sequestration
Humanities and Social Sciences
Hydrogen bonding
multidisciplinary
Science
Science (multidisciplinary)
Synthesis
Transition metals
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Summary:Derivatives of free monocoordinated borylenes have attracted considerable interest due to their ability to exhibit transition-metal-like reactivity, in particular small molecules capture. However, such complexes are rare as the formation is either endergonic, or the resulting adduct is a transient intermediate that is prone to reaction. Here, we present the synthesis of two bis( N -heterocyclic carbene)-borylene complexes capable of capturing and functionalizing carbon dioxide. The capture and subsequent functionalization of CO 2 by the bis(NHC)-disilylamidoborylene 1 is demonstrated by the formation of the bis(NHC)-isocyanatoborylene-carbon dioxide complex 3 . Reversible capture of CO 2 is observed using the bis(NHC)-mesitylborylene 2 , and the persistent bis(NHC)-mesitylborylene-carbon dioxide adduct 4 can be stabilized by hydrogen bonding with boric acid. The reactions of 4 with ammonia-borane and aniline demonstrate that the captured CO 2 can be further functionalized. Bis( N -heterocyclic carbene)-borylene complexes are capable of capturing and functionalizing CO 2 , but stable single-site-boron-carbon dioxide adducts are rarely reported. Here, the authors report the synthesis of a stable borylene-CO 2 complex as well as the functionalization of the captured CO 2 .
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ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-024-47381-7