Integer-Spin Multifrequency EPR Spectroscopy of a Ferromagnetically Coupled, Oxo-Bridged MnIVMnIV Model Complex

Abstract

Even systems with integer spins such as [L2Mn(μ-O)(μ-phBO2)2](PF6)2 (1, S=3; L=1,4,7-trimethyl-1,4,7-triazacyclononane, phBO2=phenyl boronic acid)—a model for the high oxidation states in several manganese-containing metalloproteins—can be studied in detail by high-field and high-frequency EPR spectroscopy (see picture, spectra recorded at 285 GHz). In association with low-frequency EPR and magnetization measurements, a complete analysis of the magnetic properties of 1 was obtained.