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Estudi del comportament magnètic en complexes trinuclears: [Cu(II)Cu(II)Cu(II)], [Ni(II)Cu(II)Ni(II)] i [Mn(II)Cu(II)Mn(II)]

Authors: Costa Sala, Ramon;

Estudi del comportament magnètic en complexes trinuclears: [Cu(II)Cu(II)Cu(II)], [Ni(II)Cu(II)Ni(II)] i [Mn(II)Cu(II)Mn(II)]

Abstract

A partir del ligando bisbidentado 1,3-bis(oxamato) propanocuprato, que tiene capacidad de actuar como puente transmisor de interacciones antiferromagnéticas, se han preparado diversos complejos bi y trinucleares. Se han sintetizado tres dinucleares de Cu(II) con las aminas bloqueadoras TN, BIPY y DIEN. Se han medido y ajustado matematicámente sus respuestas de susceptibilidad según la temperatura por ecuaciones de Bleaney-Bowers modificadas. Del primero, al obtenerse estructura cristalina se ha realizado un estudio OM-EH de sus propiedades magnéticas. Asímismo se han sintetizado los complejos trinucleares de Cu(II) con aminas de bloqueo TMEN, BAPA, PMDIEN, ETTMDIEN y PETDIEN. Se han obtenido las estructuras cristalinas de todos excepto el último. Mediante cálculos simplificados OM-EH, se ha intentado relacionar sus propiedades magnéticas medidas experimentalmente con las características estructurales, en especial la geometría de los cationes terminales. Asímismo, se han sintetizado los siguientes trinucleares [ Ni(II)Cu(II)Ni(II) ] según las aminas de bloqueo: BAPA, BQEN, CYCLAM, TMCYCLAM y (3,3,3). Del primero se ha obtenido la estructura cristalina. Se han estudiado los complejos por técnicas de susceptibilidad magnética a temperatura variable y EPR. Las conclusiones nos indican un efecto ZFS en el nivel fundamental para los cuatro últimos productos. Finalmente, se ha sintetizado y caracterizado un complejo [ Mn(II)Cu(II)Mn(II) ]. Al medir la respuesta de susceptibilidad se ha observado un posible efecto ZFS en el estado decuplete fundamental. Para su estudio, ha sido necesario desarrollar las ecuaciones de susceptibilidadad anisotropa y promedio para un sistema de este tipo, que nos ha permitido el ajuste matemático de los datos experimentales.

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Spain
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Keywords

Complejos metálicos, Magnetisme, Metal complexes, Magnetism, Coordination compounds, Compostos de coordinació, 546, Compuestos de coordinación, Magnetismo, Complexos metàl·lics, Ciències Experimentals i Matemàtiques

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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
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