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Scanning transmission X-ray microspectroscopy (STXM) and L-edge near-edge X-ray absorption fine structure (NEXAFS) spectroscopy have been applied to study the valence states of metal ions in various Fe- and Mn-containing single-molecule magnet materials, in particular the ligand-stabilized metal complexes NaFe 6  (so-called “ferric wheel”), Fe 4  (so-called “ferric star”) and Mn 7  (so-called “manganese wheel”).We compare dose-dependent L-edge absorption spectra with the results of theoretical studies of the involved metal ions to conclude on the change in oxidation state upon increasing the X-ray dose. It is found that even low-intensity irradiation induces the reduction of the weakly interacting metal ions, and that the soft X-ray-induced photoreduction is less pronounced in microcrystalline films.

Microspectroscopic Analysis of the X-Ray-induced Photoreduction in Fe- and Mn-containing SMMs