[La(ηx-Bx)La]− (x = 7–9): a new class of inverse sandwich complexes
| Autor: | Jun Li, Wan-Lu Li, Lai-Sheng Wang, Teng-Teng Chen |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Lanthanide
Materials science 010405 organic chemistry Inverse chemistry.chemical_element General Chemistry 010402 general chemistry Ring (chemistry) 01 natural sciences 0104 chemical sciences 3. Good health Nanoclusters Crystallography Delocalized electron chemistry Binary clusters Boron Electron counting |
| Zdroj: | Chemical Science. 10:2534-2542 |
| ISSN: | 2041-6539 2041-6520 |
| DOI: | 10.1039/c8sc05443f |
| Popis: | Despite the importance of bulk lanthanide borides, nanoclusters of lanthanide and boron have rarely been investigated. Here we show that lanthanide–boron binary clusters, La2Bx−, can form a new class of inverse-sandwich complexes, [Ln(ηx-Bx)Ln]− (x = 7–9). Joint experimental and theoretical studies reveal that the monocyclic Bx rings in the inverse sandwiches display similar bonding, consisting of three delocalized σ and three delocalized π bonds. Such monocyclic boron rings do not exist for bare boron clusters, but they are stabilized by the sandwiching lanthanide atoms. An electron counting rule is proposed to predict the sizes of the Bx ring that can form stable inverse sandwiches. A unique (d-p)δ bond is found to play important roles in the stability of all three inverse-sandwich complexes. |
| Databáze: | OpenAIRE |
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