High nuclearity magnetic clusters: Magnetic properties of a nine cobalt cluster encapsulated in a polyoxometalate, [Co9(OH)3(H2O)6(HPO4)2(PW9O34)3]16⊕
Source abstract
Abstract
One goal in molecular magnetism is the synthesis of clusters containing large numbers of coupled spins. In the title heteropolyanion three reconstituted Keggin like fragments [PCo3 W9O40] are assembeled to increase the spin nuclearity. The Figure shows the idealizedstructure of the Co9 cluster, illustrating the connections through oxygen and HPO⊖ groups. Magnetic measurements and EPR spectra are presented, and the nature of the cluster ground state discussed. magnified image
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Research context
OpenAlex topics: Polyoxometalates: Synthesis and Applications · Metal-Organic Frameworks: Synthesis and Applications · Advanced Nanomaterials in Catalysis
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References (18)
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17. This assumption is justified by the fact that the Co–Co exchange constants are much smaller than the spin‐orbit coupling constant of Co(II). Therefore the splitting pattern of the lowest lying spin‐states of the cluster is expected to result from the interaction between the lowest anisotropic Kramers doublet of the Co(II) ions. On the other hand the use of the fully anisotropic Ising model is justified by its simplicity and also by the fact that the magnetic susceptibility has shown to be almost insensitive to the amount of exchange‐anisotropy (see [4 b]).
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