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Titration of the EPR signal intensities as function of bicarbonate concentration for the MnIIaq species (g2 six-line spectrum, Inset) and the broad signal that replaces it upon addition of bicarbonate (broad signal, Inset). The broad signal is detectable only below 70 K, and it exhibits strong spin relaxation and a temperature-dependent linewidth and a g value indicative of formation of a MnIIx-bicarbonate oligomer.
