Abstract

The ultraviolet difference spectra of isostructural multinuclear manganese carboxylate complexes which differ in manganese oxidation levels are described and compared against similar spectra reported for Mn catalase and reported to accompany the S-state transitions of the photosynthetic Mn. Analysis of the spectra suggest that previous assignments of specific Mn oxidation-state changes to the spectral features accompanying the S-state transitions are premature. The significance of the ultraviolet difference spectra associated with well-characterized Mn oxidation-state changes of Mn catalase are discussed in relation to the S-state difference spectra.

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