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Mixed‐valence trinuclear manganese clusters : Influence of the electronic transfer on the magnetic properties

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Mixed‐valence trinuclear manganese clusters : Influence of the electronic transfer on the magnetic properties

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Gómez García, Carlos José; Coronado Miralles, Eugenio; Pourroy, G.

Aquest document és un/a article, creat/da en: 1990

Este documento está disponible también en : http://scitation.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=JAPIAU000067000009005992000001&idtype=cvips&prog=normal&doi=10.1063/1.346041

The magnetic behavior of mixed‐valence trinuclear clusters d4‐d4‐d5 is discussed on the basis of a model which takes into account valence delocalization and Heisenberg exchange. This model considers the competing effect between the electronic transfer and the localization of the extra electron due to an asymmetry of the triangular entity. The magnetic properties of the mixed‐valence oxo‐centered Mn(II)‐Mn(III)‐Mn(III) complexes formulated as Mn3O(O2CR)6L3 (R=Me, L=pyridine) are discussed on the basis of the developed model, supporting a significant intramolecular electron transfer. A comparison of these results to those previously reported by assuming a valence‐trapped model is given.

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