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El conductor molecular de radicales neutrales basado en trisfenalenilo es un conductor molecular de radicales

Sushanta K Pal¹, Mikhail E Itkis, Fook S Tham

¹Department of Chemistry, University of California, Riverside, California 92521-0403, USA.

Journal of the American Chemical Society

|March 1, 2008

Resumen

Los investigadores sintetizaron y caracterizaron nuevos radicales neutros de fenalenilo) silicio tris{1,9-disubstituido. Estas moléculas exhiben un empaquetado débil de pi-dimeros en estado sólido y muestran acoplamiento antiferromagnético a bajas temperaturas.

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Área de la Ciencia:

Ciencia de los materiales Ciencia de los materiales.
Química orgánica es la química orgánica.
Física del estado sólido Física del estado sólido

Sus antecedentes:

Los radicales de fenalenilo son conocidos por sus propiedades electrónicas y magnéticas únicas.
El desarrollo de nuevos sistemas radicales es crucial para el avance de la electrónica molecular y la espintrónica.

Objetivo del estudio:

Informar sobre la síntesis y caracterización de una nueva familia de radicales neutros de fenalenil) silicio tris{1,9-disubstituido.
Para investigar el embalaje en estado sólido, las propiedades magnéticas y la conductividad eléctrica de estos nuevos radicales.

Principales métodos:

Difracción de rayos X monocristalino para el análisis estructural.
Mediciones de susceptibilidad magnética para determinar el comportamiento magnético.
Mediciones de conductividad eléctrica utilizando un método de cuatro sondas.

Principales resultados:

Se preparó y cristalizó con éxito el primer miembro de la familia de radicales neutros de fenalenil) silicio tris{1,9-disubstituido.
La caracterización del estado sólido reveló un débil empaque parcial de pi-dimero con contactos intermoleculares C-C cerca de las distancias de van der Waals.
La susceptibilidad magnética indicó aproximadamente 0,7 giros de Curie por molécula, con acoplamiento antiferromagnético observado por debajo de 50 K.
La conductividad de un solo cristal a temperatura ambiente se midió en 2,4 x 10 ((-6) S cm ((-1).

Conclusiones:

El estudio presenta una nueva clase de radicales neutros centrados en el silicio con interesantes propiedades de estado sólido.
La pi-dimerización observada y el acoplamiento magnético sugieren el potencial para aplicaciones en materiales moleculares.
Se justifica una mayor investigación sobre las relaciones estructura-propiedad en esta familia radical.