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(a) Mn XANES spectra and (b) second derivative spectra of [2-Ca(DME)(OTf)][OTf] (dotted) and [1-Ca(DME)(OTf)][OTf]2 (solid). The shift in the rising edge energy of the two complexes (6548.66 and 6549.76 eV respectively) suggests a one-electron oxidation state change.
