Synthesis and characterization of copper complexes with mixed S-and N-donor ligand systems are important aspects in modern bioinorganic chemistry. Our aim is to synthesize copper complexes with thiourea ligands. In coordination chemistry, thiourea derivatives are useful ligands because of their versatile coordination behavior, as they are able to coordinate metal atoms via nitrogen or sulfur atoms, respectively. One aspect is to investigate the influence of hydrogen bridge bonds in complexes and ligands itself. In our research group, one goal is to synthesise model complexes which are able to mimic the structural and electrochemical properties of CuA. Maybe, the chemistry of this work could lead to synthesize copper complexes which could mimic some aspects of active sites in biomolecules. In the first part of this thesis, the synthesis and characterization of the thiourea derivates are investigated. Besides, calculations on DFT level were performed regarding the reliability of this method to predict the experimental conformation of the ligand. The second part consists of the synthesis and characterization of the complexes. In case of the reaction of CuBr2 with the ligand L1, the Cu(I) complexes [Cu(StuNH)Br]n K1, [Cu2(StuNH)4Br2] K3 and [Cu6(StuN)6] K5 are obtained. The products of the reaction with L10 are the Cu(I) complexes [Cu(Stu(Py)NH)Br]n K2 and [Cu2(Stu(Py)NH)2Br2(MeCN)2] K4. Further investigations based on spectroscopic and electrochemical analysis were carried out. The studies presented here contribute to a better understanding of structure, function and physical properties of copper complexes with thiourea derivatives as ligands.