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Cruce de espín en el fullereno aniónico con puente de cobalto (Bu₄N⁺) {Co(Ph₃P)}₂(μ₂-Cl^-)

Dmitri V Konarev¹, Salavat S Khasanov², Alexander F Shestakov¹

¹Institute of Problems of Chemical Physics RAS , Chernogolovka, Moscow Region 142432, Russia.

Journal of the American Chemical Society

|December 13, 2016

Resumen

Se observaron fenómenos de cruce de espín en un complejo de cobalto y fullereno. Esta transición implica una transferencia de carga de cobalto a fullereno, formando un estado excitado de quinteto.

Área de la Ciencia:

Química inorgánica
Ciencias de los materiales
Química supramolecular

Sus antecedentes:

El cruce de espín (SCO) es un fenómeno en el que los complejos de metales de transición pueden cambiar entre estados de espín bajo y alto.
Los fullerenos (C60) son alótropos de carbono con propiedades electrónicas y estructurales únicas.
Los complejos aniónicos de cobalto y fullereno ofrecen potencial para nuevos materiales electrónicos y magnéticos.

Objetivo del estudio:

Para investigar los fenómenos de cruce de espín en un nuevo complejo aniónico de cobalto y fullereno.
Para aclarar el mecanismo de la transición de espín que implica la transferencia de carga.
Para caracterizar los estados electrónicos y magnéticos del complejo.

Principales métodos:

Síntesis y caracterización del complejo aniónico (Bu4N+) {Co(Ph3P) }2(μ2-Cl-) ((μ2-η2,η2-C60) 2·2C6H14 (1).
Mediciones de la susceptibilidad magnética para detectar las transiciones de giro.
Técnicas espectroscópicas para sondear eventos de transferencia de carga.

Principales resultados:

Observación de fenómenos de cruce de espín en el complejo 1 por encima de 150 K.
El dímero exhibe un estado de base triplet con dos átomos de Co(0) de acoplamiento débil (S = 1/2).
La transición de espín está acompañada por la transferencia de carga de cobalto a fullereno, formando un quinteto de estado excitado con alto espín Co ((I) (S = 1) y C60•- (S = 1/2).

Conclusiones:

El estudio demuestra el cruce de espín en un dímero de cobalto-fulereno impulsado por transferencia de carga.
Este hallazgo pone de relieve el potencial de los complejos basados en fullereno para el desarrollo de materiales moleculares intercambiables.
El mecanismo de transición de espín observado proporciona información sobre la dinámica de los electrones en los sistemas de metal-fulereno.

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