Correlation between electronic g-tensor of W5+ and 183W NMR chemical shifts of polyoxotungstates. Relation with other d1 cations (V, MO, Re)статья
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Аннотация:The parameters of the 183W NMR for a large number of polyoxotungstates and ESR W5+ spectra of their reduced by one electron forms are analyzed together with their structural characteristics. Two correlations between the d-chemical shifts of 183W NMR and <g> values of W5+ are found. For closely related heteropoly tungstates the <g> values decrease with the increasing shielding of W. For the polytungstates with increasing number of corner sharing oxygen atoms the <g> value increases with the increasing shielding. The close similarities in the behavior of the chemicals shifts of 95Mo NMR and <g> tensor deduced from Mo5+ ESR have been shown for closely related structural types of polymolybdates and polytungstates.