Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 56, Issue 32, Pages 9551-9555Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201705209
Keywords
ab initio calculations; bismuth; boron; multiple bonds; photoelectron spectroscopy
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Funding
- National Science Foundation [CHE-1263745]
- Chemistry Department of Brown University
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1263745] Funding Source: National Science Foundation
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Despite its electron deficiency, boron is versatile in forming multiple bonds. Transition-metal-boron double bonding is known, but boron-metal triple bonds have been elusive. Two bismuth boron cluster anions, BiB2O- and Bi2B-, containing triple and double B/Bi bonds are presented. The BiB2O- and Bi2B- clusters are produced by laser vaporization of a mixed B/Bi target and characterized by photoelectron spectroscopy and ab initio calculations. Well-resolved photoelectron spectra are obtained and interpreted with the help of ab initio calculations, which show that both species are linear. Chemical bonding analyses reveal that Bi forms triple and double bonds with boron in BiB2O- ([Bi B-B O](-)) and Bi2B- ([Bi=B=Bi](-)), respectively. The Bi-B double and triple bond strengths are calculated to be 3.21 and 4.70 eV, respectively. This is the first experimental observation of Bi-B double and triple bonds, opening the door to design main-group metal-boron complexes with multiple bonding.
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