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To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Cyanohydrins are formed when cyanide nucleophiles and carbonyl compounds like aldehydes and ketones react. A strong base, the cyanide ion, catalyzes cyanohydrin formation. The ions are generated from HCN under aqueous conditions. Once the cyanide ions are generated, the first step involves the nucleophilic attack of the cyanide ions on the electrophilic carbonyl carbon. This attack shifts the π electrons from the C=O to the oxygen atom forming the alkoxide ion intermediate. The alkoxide...
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For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
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La transferencia de electrones de los hidratos de cobre hexamérico se hace por transferencia de electrones.

Michael S Eberhart1, Jack R Norton, Ashley Zuzek

  • 1Department of Chemistry, Columbia University , New York, New York 10027, United States.

Journal of the American Chemical Society
|November 1, 2013
PubMed
Resumen

Los hexámeros de hidruro de cobre son estables en solución, con ligandos de hidruro que se reorganizan internamente. Se observaron reacciones de transferencia de un solo electrón utilizando técnicas de voltametría cíclica y de flujo detenido para estos grupos de hidruro de cobre.

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Área de la Ciencia:

  • Química organometálica Química orgánica de los metales.
  • Coordinación Química de la Coordinación
  • La fotoquímica es la fotoquímica.

Sus antecedentes:

  • Los complejos de hidruro de cobre son catalizadores conocidos, pero su reactividad en solución no se comprende completamente.
  • La estabilidad y las propiedades electrónicas de los cúmulos de hidruro de cobre ricos en electrones requieren una mayor investigación.

Objetivo del estudio:

  • Para investigar la estabilidad de la solución y la reactividad de los hexámeres de hidruro de cobre de 84 electrones.
  • Para caracterizar los procesos de transferencia de un solo electrón que involucran estos complejos de hidruro de cobre.
  • Para sintetizar y estudiar un novedoso trímero de hidruro de cobre de 48 electrones.

Principales métodos:

  • Técnicas de flujo detenido para observar la cinética de reacción rápida.
  • Voltametría cíclica para estudiar las propiedades redox y la formación de cationes radicales.
  • Espectroelectroquímica para confirmar los espectros UV-vis de los radicales catiónicos.
  • Síntesis de complejos de hidruro de cobre con ligandos específicos.

Principales resultados:

  • El núcleo octaédrico de los hexámeres de hidruro de cobre de 84 electrones permanece intacto en solución.
  • Los ligandos hidruro dentro de los hexámeres se someten a una rápida reorganización intramolecular.
  • Se observó la transferencia de un solo electrón de [(Ph3P) CuH]6 a un catión de piridinio.
  • Se generó y caracterizó un catión radical estable de [(Ph3P) CuH]6.
  • Se sintetizó un nuevo trímero de hidruro de cobre de 48 electrones, [(dppbz) CuH]3.

Conclusiones:

  • Los hexámeres de hidruro de cobre de 84 electrones exhiben una estabilidad de solución significativa.
  • La transferencia de un solo electrón es una vía de reacción viable para estos complejos de hidruro de cobre.
  • La síntesis de [(dppbz) CuH]3 amplía el alcance de las agrupaciones conocidas de hidruro de cobre.