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Anillos de boro de nueve miembros centrados en metales de transición: McB9 y McB9(-) (M = Rh, Ir)
Wei-Li Li1, Constantin Romanescu, Timur R Galeev
1Department of Chemistry, Brown University, Providence, Rhode Island 02912, USA.
Journal of the American Chemical Society
|December 14, 2011
Resumen
Dos nuevos anillos de boro dopados con metales de transición, el Rodio-Boro (RhcB (((9) ((-)) y el Iridio-Boro (IrcB (((9) ((-)), exhiben una notable estabilidad y aromaticidad. Estos hallazgos introducen los anillos de boro dopados con metales como una nueva clase de ruedas moleculares.
Área de la Ciencia:
- Química Inorgánica La Química Inorgánica es la química inorgánica.
- Química cuántica es la química cuántica.
- Ciencia de los materiales Ciencia de los materiales.
Sus antecedentes:
- El dopaje de metales de transición de los grupos de boro es un área emergente de investigación.
- Comprender la estructura electrónica y la unión en tales grupos es crucial para predecir sus propiedades.
Objetivo del estudio:
- Para sintetizar y caracterizar nuevos anillos de boro de nueve átomos centrados en metales de transición.
- Investigar la estructura electrónica, la estabilidad y la aromaticidad de RhcB ((9)) y IrcB ((9)).
Principales métodos:
- Técnica de haz molecular supersónico de vaporización láser para la generación de racimos.
- Espectroscopia de fotoelectrones para la caracterización experimental de las propiedades electrónicas.
- Ab initio cálculos para el análisis teórico de la estructura y la unión.
Principales resultados:
- Observación de dos anillos de boro de nueve átomos centrados en metales de transición: RhcB ((9)) y IrcB ((9)).
- Los espectros de fotoelectrones revelaron grandes brechas HOMO-LUMO, lo que indica una alta estabilidad para el RhcB ((9) e IrcB ((9) neutros.
- Los cálculos teóricos confirmaron la simetría D ((9h) y revelaron una doble aromaticidad con electrones π y σ deslocalizados.
Conclusiones:
- Los racimos sintetizados de RhcB ((9) e IrcB ((9) son especies estables de caparazón cerrado.
- Estos anillos de boro dopados con metal exhiben características únicas de unión aromática.
- Este estudio establece los anillos de boro dopados con metales como una nueva clase de ruedas moleculares aromáticas.
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