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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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Transformaciones impulsadas mecanoquímicamente en la química organotínica: reordenamiento estereoquímico,

Ross F Koby1, Timothy P Hanusa1, Nathan D Schley1

  • 1Department of Chemistry , Vanderbilt University , VU Station B #351822 , Nashville , Tennessee 37235 , United States.

Journal of the American Chemical Society
|October 28, 2018
PubMed
Resumen
Este resumen es generado por máquina.

La mecanoquímica permitió la síntesis de nuevos compuestos organotínicos, incluidas las especies quirales de tetra (al) tinas, que son inestables en solución pero persistentes en estado sólido debido a las interacciones de dispersión.

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Área de la Ciencia:

  • Química organometálica
  • Química del estado sólido
  • Mecanoquímica

Sus antecedentes:

  • Los compuestos de organotina son versátiles, pero su síntesis puede ser un desafío.
  • Las reacciones basadas en soluciones a menudo limitan el acceso a arquitecturas moleculares específicas.

Objetivo del estudio:

  • Para explorar la utilidad de la molienda de bolas para sintetizar nuevos compuestos de organotina.
  • Investigar la estabilidad y las propiedades estructurales de los complejos de estaño sintetizados mecanicamente.

Principales métodos:

  • Moldeo en bolas de alilo de potasio [A'] y cloruro de estaño (SnCl2).
  • Cristalografía de rayos X de un solo cristal para la autenticación estructural.
  • Cálculos de la teoría funcional de la densidad corregida por dispersión (DFT).

Principales resultados:

  • Síntesis del polímero de coordinación de estanato de tris ((allyl) [SnA'3K]∞ mediante fresado en 5 minutos.
  • Formación de las especies quirales de tetra ((allilo) tinas [SnA'4] y un meso diastereómero a través de molienda extendida o proporciones de reactivo alteradas.
  • Inestabilidad demostrada en solución (<1 h) y estabilidad significativa en estado sólido (> meses) para [SnA'4].
  • Los cálculos de DFT confirmaron el papel de las interacciones de dispersión de Londres en la estabilización de las estructuras de estado sólido.

Conclusiones:

  • La activación mecanoquímica proporciona acceso a compuestos orgánicos únicos que no se pueden obtener a través de la síntesis de la fase de solución.
  • La estabilidad de las especies de tetra ((allyl) tin estéricamente agrupadas se ve significativamente mejorada en estado sólido por las fuerzas de dispersión entre los ligandos.
  • Este estudio destaca la mecanoquímica como una herramienta poderosa para la química de la organotina.