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Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-(phosphinetriyl)tripiperidine]}palladium Under Mild Reaction Conditions
Published on: March 20, 2014
La pi-dimerización intramolecular en un di-radical de ferroceno 1,1'-bis(verdazilico) se encuentra en la molécula
Bryan D Koivisto1, Andrew S Ichimura, Robert McDonald
1Department of Chemistry, University of Victoria, P.O. Box 3065 STN CSC, Victoria, BC V8W 3V6, Canada.
Journal of the American Chemical Society
|January 19, 2006
Resumen
Este estudio presenta el primer pidímero de un radical verdazil estable en estado sólido. En solución, esta estructura se pierde, y los estudios magnéticos muestran que la molécula es diamagnética a temperatura ambiente debido al fuerte acoplamiento antiferromagnético.
Área de la Ciencia:
- Química organometálica Química orgánica de los metales.
- Química Radical La Química Radical es una ciencia
- La cristalografía es una técnica de cristalografía.
Sus antecedentes:
- Los radicales orgánicos estables ofrecen propiedades electrónicas y magnéticas únicas.
- Los radicales verdasilicos son una clase bien conocida de radicales orgánicos estables.
- Los derivados del ferroceno son ampliamente estudiados por su versatilidad electrónica y estructural.
Objetivo del estudio:
- Para sintetizar y caracterizar la estructura en estado sólido de 1,1'-bis(verdazil) ferroceno.
- Para investigar el comportamiento de la solución y las propiedades magnéticas de este nuevo compuesto.
- Para explorar la formación de pi-dimeros intramoleculares que involucran radicales verdazil estables.
Principales métodos:
- Difracción de rayos X monocristalino para determinar la estructura del estado sólido.
- Análisis espectroscópico del estado de solución (por ejemplo, RMN, UV-Vis).
- Mediciones de la susceptibilidad magnética (por ejemplo, magnetometría SQUID).
Principales resultados:
- La estructura en estado sólido revela un pi-dimero intramolecular sin precedentes de dos fracciones de radicales verdazil.
- El arreglo de los pi-dimeros no se conserva en la solución.
- La caracterización magnética demuestra un fuerte acoplamiento antiferromagnético entre los radicales, lo que lleva al diamagnetismo a temperatura ambiente.
Conclusiones:
- El 1,1'-bis(verdazil)ferroceno representa el primer ejemplo de un pi-dimero formado a partir de radicales estables de verdazil en estado sólido.
- El diamagnetismo observado a temperatura ambiente pone de relieve una interacción intramolecular significativa entre el radical y el radical.
- Este hallazgo abre nuevas vías para diseñar moléculas con propiedades magnéticas sintonizables basadas en interacciones radical-radical.
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