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Síntesis y propiedades de los dendrímeros de poliéster alifáticos funcionalizados con carborano
Matthew C Parrott1, Erin B Marchington, John F Valliant
1Department of Chemistry, McMaster University, Hamilton, Ontario, Canada.
Journal of the American Chemical Society
|August 25, 2005
Resumen
Los investigadores crearon nuevos dendrímeros que incorporan múltiples jaulas de carborano ricas en boro. Estos dendrímeros que contienen carborano muestran potencial para la terapia de captura de neutrones de boro y exhiben propiedades únicas de solubilidad.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Nanotecnología La nanotecnología es la nanotecnología.
- Química de Polímeros La Química de Polímeros es la química de los polímeros.
Sus antecedentes:
- Los dendrímeros ofrecen arquitecturas moleculares muy precisas.
- Los carboranos son grupos ricos en boro con propiedades únicas.
- La integración de los carboranos en los dendrímeros es un reto.
Objetivo del estudio:
- Para sintetizar nuevos dendrímeros de poliéster alifático que contienen múltiples jaulas de p-carborano.
- Investigar las propiedades de estos dendrímeros funcionalizados con carborano, incluyendo la solubilidad y la respuesta a la irradiación de neutrones.
Principales métodos:
- Preparación de un sintetizador bifuncional de p-carborano.
- Acoplamiento del sintón a los dendrímeros de baja generación a través de la esterificación.
- Más dendronización utilizando un enfoque divergente.
- Desprotección periférica para lograr la solubilidad en agua.
- Irradiación con neutrones térmicos para evaluar los eventos de captura de neutrones de boro.
Principales resultados:
- Sintetizó con éxito dendrímeros de cuarta y quinta generación con 4, 8 o 16 jaulas de carborano.
- Se alcanza la solubilidad en agua para dendrímeros con suficientes grupos hidroxilo periféricos.
- Se observó una temperatura de solución crítica más baja en algunos dendrímeros solubles en agua.
- Se detectó la emisión de radiación gamma sobre la irradiación de neutrones, confirmando la captura de neutrones de boro.
Conclusiones:
- Se desarrolló un método robusto para incorporar múltiples jaulas de p-carborano en dendrímeros de poliéster alifáticos.
- Los dendrímeros de carborano sintetizados exhiben solubilidad acuosa ajustable y propiedades térmicas únicas.
- La capacidad de captura de neutrones de boro de estos dendrímeros se verificó experimentalmente, lo que sugiere aplicaciones potenciales en la terapia de captura de neutrones de boro (BNCT).
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