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Se pueden aislar radicales polisilílicos fotorreactivos aislables.

Gregory Molev1, Boris Tumanskii, Dennis Sheberla

  • 1Schulich Faculty of Chemistry and the Lise Meitner Minerva Center for Computational Quantum Chemistry, Technion-Israel Institute of Technology, Haifa 32000, Israel.

Journal of the American Chemical Society
|September 3, 2009
PubMed
Resumen
Este resumen es generado por máquina.

Los radicales sililo estables fueron sintetizados utilizando un nuevo método de un solo paso. Estos radicales de silicio exhiben propiedades fotoquímicas únicas, con un tipo de descomposición en silano y disileno, mientras que el otro se somete a la abstracción de hidrógeno tras la irradiación.

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Área de la Ciencia:

  • Química del organosilicio Química del organosilicio
  • Química Radical La Química Radical es una ciencia
  • La fotoquímica es la fotoquímica.

Sus antecedentes:

  • Los radicales sililo estables son intermediarios cruciales en la química del silicio.
  • Los métodos anteriores para sintetizar los radicales sililo eran limitados.
  • Comprender la reactividad y la fotoquímica de los radicales sililo es esencial para el desarrollo de nuevas rutas sintéticas.

Objetivo del estudio:

  • Desarrollar un método general y eficiente de un solo paso para sintetizar radicales silílicos estables.
  • Caracterizar la estructura y las propiedades de los radicales sililo recién sintetizados.
  • Para investigar el comportamiento fotoquímico y los mecanismos de reacción de estos radicales silílicos.

Principales métodos:

  • Reacción de los diclorosilanos sustituidos por sililo con los litiosilanos en el hexano.
  • Aislamiento y caracterización completa de los radicales sililo, incluida la cristalografía de rayos X.
  • Experimentos de irradiación fotoquímica (λ > 400 nm) y cálculos de DFT.

Principales resultados:

  • Una nueva síntesis de un solo paso produce exclusivamente radicales silílicos estables.
  • Se aislaron y caracterizaron dos radicales silílicos, (t-Bu(2)MeSi)(2)HSi(t-Bu(2)MeSi)(2)Si* (1) y (t-Bu(2)MeSi)(3)Si* (2), los cuales fueron identificados y caracterizados.
  • El radical 1 se somete a una descomposición fotolítica a silano y disileno; el radical 2 muestra fotostabilidad, pero abstrae el hidrógeno tras la irradiación.
  • Los cálculos de DFT y los datos de irradiación indican SOMO-1 → La excitación SOMO influye en la fotoreactividad.

Conclusiones:

  • El método de un solo paso desarrollado es un enfoque general para sintetizar diversos radicales silílicos estables.
  • Los radicales sililo exhiben una reactividad fotoquímica distinta, influenciada por su estructura electrónica.
  • La fotoreactividad está vinculada a excitaciones electrónicas específicas, lo que permite transformaciones químicas controladas.