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Tendencias en la interacción de intercambio metal-birádico para la primera fila de complejos M(II) ((nitróxido de

David A Shultz¹, Kira E Vostrikova, Scot H Bodnar

¹Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, USA.

Journal of the American Chemical Society

|February 6, 2003

Resumen

Los nuevos complejos metálicos con ligandos birádicos exhiben un fuerte acoplamiento magnético. El intercambio intraligando es clave para estabilizar los estados de alto espín en estos nuevos materiales magnéticos.

Área de la Ciencia:

Coordinación Química de la Coordinación
Magnetoquímica es la Magnetoquímica.
Ciencia de los materiales Ciencia de los materiales.

Sus antecedentes:

Se sintetizan los ligandos de la heterospina que combinan los portadores de espín del nitronil-nitróxido (NN) y la semiquinona (SQ).
Estos ligandos forman complejos con varios metales de transición (Mn, Co, Ni, Cu, Zn).

Objetivo del estudio:

Investigar las estructuras moleculares y propiedades magnéticas de nuevos complejos metálicos con ligandos birádicos.
Comprender la naturaleza de las interacciones de intercambio magnético entre los iones metálicos y los ligandos birádicos.

Principales métodos:

Síntesis y caracterización estructural de los complejos de cinco coordenadas M (II) y de seis coordenadas Ni (II).
Mediciones de susceptibilidad magnética de temperatura variable.
Análisis computacional que incluye análisis de spin dimer y cálculos extendidos de Hückel.

Principales resultados:

Caracterización estructural de cinco complejos metálicos, incluido un anillo SQ único sustituido por methoxy en un complejo de cobre.
Se observó un fuerte acoplamiento de intercambio ferromagnético intraligando (NN-SQ y NN-PhSQ).
Acoplamiento antiferromagnético entre el ligando S=1 y los iones metálicos en los complejos Mn, Co y Ni; acoplamiento ferromagnético en los complejos Cu y Ni.
Interacciones de intercambio antisimétrico observadas en complejos específicos de Ni.

Conclusiones:

El acoplamiento de intercambio intraligando es crucial para estabilizar los estados de alto espín en complejos metálicos-birádicos mixtos.
Los argumentos de simetría orbital predicen con éxito el acoplamiento ferromagnético metal-ligando.
El estudio proporciona información sobre el diseño de nuevos materiales magnéticos con propiedades sintonizables.

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