Nb2©Au6: a molecular wheel with a short NbNb triple bond coordinated by an Au6 ring and reinforced by σ aromaticity
| Autor: | Joseph Czekner, Teng-Teng Chen, Gary V. Lopez, Ling Fung Cheung, Wei-Li Li, Lai-Sheng Wang, Tian Jian |
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| Rok vydání: | 2017 |
| Předmět: |
Chemistry
Bridging ligand Aromaticity 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Ring (chemistry) Photochemistry Triple bond 01 natural sciences 0104 chemical sciences Bond length Delocalized electron chemistry.chemical_compound Crystallography Chemical bond 0210 nano-technology Quintuple bond |
| Zdroj: | Chem. Sci.. 8:7528-7536 |
| ISSN: | 2041-6539 2041-6520 |
| DOI: | 10.1039/c7sc02881d |
| Popis: | We report a photoelectron spectroscopy and high-resolution photoelectron imaging study of a bimetallic Nb2Au6− cluster. Theoretical calculations, in conjunction with the experimental data, reveal that Nb2Au6−/0 possess high-symmetry D6h structures featuring a Nb–Nb axis coordinated equatorially by an Au6 ring. Chemical bonding analyses show that there are two π bonds and one σ bond in the Nb2 moiety in Nb2©Au6, as well as five totally delocalized σ bonds. The NbNb triple bond is strengthened significantly by the delocalized σ bonds, resulting in an extremely short Nb–Nb bond length comparable to the quintuple bond in gaseous Nb2. The totally delocalized σ bonding in Nb2©Au6 is reminiscent of σ aromaticity, representing a new bonding mode in metal–ligand systems. The unusually short Nb–Nb bond length in Nb2©Au6 shows that the Au6 ring can serve as a bridging ligand to facilitate multiple bonding in transition metal dimers via delocalized σ bonding. |
| Databáze: | OpenAIRE |
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