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Construyendo capa por capa un complejo de bis ((dithiocarbamato) cobre ((II) en las superficies Au[111].
Roberto Cao1, Alicia Díaz, Roberto Cao
1Laboratorio de Bioinorganica, Facultad de Química, Universidad de La Habana, La Habana 10400, Cuba.
Journal of the American Chemical Society
|May 5, 2007
Resumen
Los investigadores construyeron un complejo de cobre sobre superficies de oro utilizando un método capa por capa. Este nuevo complejo autoensamblado de cobre bis ((dithiocarbamato) (CuDTC2) demuestra un ensamblaje y caracterización controlados de la superficie.
Área de la Ciencia:
- Química de las superficies.
- Nanotecnología La nanotecnología es la nanotecnología.
- Coordinación Química de la Coordinación
Sus antecedentes:
- Las monocapas autoensambladas (SAM) son cruciales para la funcionalidad de la superficie.
- Los complejos de diticarbamato ofrecen propiedades electrónicas y de coordinación únicas.
- La síntesis controlada de complejos metálicos en superficies es un reto.
Objetivo del estudio:
- Para sintetizar y caracterizar un nuevo complejo de cobre bis ((dithiocarbamato) (CuDTC2) en superficies Au{111}.
- Para investigar el proceso de ensamblaje capa por capa (LbL) del complejo.
- Para estudiar el comportamiento de la superficie y la reorientación del complejo utilizando métodos electroquímicos.
Principales métodos:
- Síntesis de 4-piperidinemethanethiol y su conversión a un ligando anfifílico (DTCpipS).
- Autoensamblaje capa por capa (LbL) en las superficies Au{111).
- Microscopía de fuerza atómica (AFM) y voltametría cíclica para el análisis de superficies.
- Espectroscopia de fotoelectrones de rayos X (XPS) y espectrometría de masa de iones secundarios de tiempo de vuelo (ToF SIMS) para confirmación compleja.
Principales resultados:
- Formación de una monocapa altamente organizada de DTCpipS en oro.
- Observación de dos picos de desorción reductiva para DTCpipS, lo que indica modos de unión distintos.
- Formación exitosa del complejo CuDTC2 en la superficie a través del ensamblaje LbL.
- Un solo pico de desorción reductora para el complejo CuDTC2, lo que significa reorientación y coordinación a través de los grupos ditiocarbamato.
Conclusiones:
- El estudio demuestra con éxito el ensamblaje LbL de un complejo de cobre bis ((dithiocarbamato) en superficies de oro.
- El análisis electroquímico reveló distintos comportamientos de unión y reorientación del ligando y el complejo.
- XPS y ToF SIMS confirmaron la formación completa y la integridad del complejo CuDTC2 ensamblado.
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