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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.