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Institute
Photosynthesis is the most fundamental process of life on earth. The biological production of oxygen in plant photosynthesis occurs in photosystem II (PSII). Here two water molecules are coupled in a four-electron oxidation to one O2 molecule, catalyzed by a tetranuclear manganese complex, known as the oxygen-evolving complex (OEC). In this thesis, density-functional theory (DFT) methods were validated and subsequently employed to study structures, spin-density distributions and EPR parameters of mono-, di-, and tetranuclear complexes with regard to the OEC. The goal was to draw conclusions on the molecular and electronic structure of the OEC.