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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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Un catión de silicio estabilizado en metales de transición único.

Kristine Müther1, Roland Fröhlich, Christian Mück-Lichtenfeld

  • 1Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstrasse 40, 48149 Münster, Germany.

Journal of the American Chemical Society
|July 22, 2011
PubMed
Resumen

Los investigadores caracterizaron un nuevo catión de silicio estabilizado por ferroceno, revelando un patrón de unión inusual. Este estudio aclara las interacciones entre el ferroceno y los cationes de silicio, importantes para comprender la acidez de Lewis.

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Área de la Ciencia:

  • Química organometálica Química orgánica de los metales.
  • Química del silicio Química del silicio
  • Química supramolecular de las moléculas.

Sus antecedentes:

  • Los cationes trivalentes de silicio son potentes ácidos de Lewis, que reaccionan fácilmente con las moléculas donantes de electrones.
  • Las unidades de ferroceno pueden atenuar intramolecularmente la acidez de Lewis de los centros de silicio.
  • Las interacciones estabilizadoras en cationes de ferroceno-silicio son poco conocidas debido a los desafíos de la cristalización.

Objetivo del estudio:

  • Para caracterizar estructuralmente un catión de silicio estabilizado con ferroceno.
  • Para dilucidar las interacciones de enlace entre la columna vertebral del ferroceno y el catión de silicio.
  • Para entender la distribución de la carga y la geometría de esta nueva especie.

Principales métodos:

  • Análisis de difracción de rayos X monocristalino.
  • Análisis computacional para comprender las interacciones de enlace.
  • Caracterización espectroscópica (implicada).

Principales resultados:

  • Se reveló un motivo de unión sin precedentes en el catión de silicio estabilizado con ferroceno.
  • Se observó un ángulo de caída extremo del átomo de silicio hacia el átomo de hierro.
  • Se identificaron dos enlaces de tres centros y dos electrones (3c2e) que involucran a ambos anillos aromáticos de ferroceno.
  • La carga positiva permanece localizada en el átomo de silicio, que mantiene una configuración cuasi-planar.

Conclusiones:

  • El estudio revela una interacción de enlace única en cationes de ferroceno y silicio, distinta de los sistemas relacionados.
  • Los hallazgos proporcionan nuevos conocimientos sobre los mecanismos de estabilización de los cationes de silicio por el ferroceno.
  • Este trabajo avanza en la comprensión de la química del organosilicio y la estabilización del ácido de Lewis.