Observation of Transition‐Metal–Boron Triple Bonds in IrB 2 O − and ReB 2 O −
| Autor: | Ling Fung Cheung, Lai-Sheng Wang, Wei-Jia Chen, Joseph Cavanagh, Teng-Teng Chen |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
010405 organic chemistry Carbyne chemistry.chemical_element General Medicine General Chemistry Electron deficiency 010402 general chemistry Triple bond 01 natural sciences Electron spectroscopy Catalysis 0104 chemical sciences Metal chemistry.chemical_compound Crystallography chemistry Transition metal Chemical bond visual_art visual_art.visual_art_medium Boron |
| Zdroj: | Angewandte Chemie International Edition. 59:15260-15265 |
| ISSN: | 1521-3773 1433-7851 |
| DOI: | 10.1002/anie.202006652 |
| Popis: | Multiple bonds between boron and transition metals are known in many borylene (:BR) complexes via metal dπ →BR back-donation, despite the electron deficiency of boron. An electron-precise metal-boron triple bond was first observed in BiB2 O- [Bi≡B-B≡O]- in which both boron atoms can be viewed as sp-hybridized and the [B-BO]- fragment is isoelectronic to a carbyne (CR). To search for the first electron-precise transition-metal-boron triple-bond species, we have produced IrB2 O- and ReB2 O- and investigated them by photoelectron spectroscopy and quantum-chemical calculations. The results allow to elucidate the structures and bonding in the two clusters. We find IrB2 O- has a closed-shell bent structure (Cs , 1 A') with BO- coordinated to an Ir≡B unit, (- OB)Ir≡B, whereas ReB2 O- is linear (C∞v , 3 Σ- ) with an electron-precise Re≡B triple bond, [Re≡B-B≡O]- . The results suggest the intriguing possibility of synthesizing compounds with electron-precise M≡B triple bonds analogous to classical carbyne systems. |
| Databáze: | OpenAIRE |
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