The development of this diploma thesis was guided by the assumption of poor knowledge of Werner's theory and his compounds among chemistry students. As part of the thesis, a web survey of 15 questions per 100 respondents (chemistry students and those who completed their studies 5 years ago) from the area of Josip Juraj Strossmayer University in Osijek and the University of Zagreb was conducted. The results of the survey were statistically processed and the assumption has been proved to be correct - students have little knowledge of Werner's work, theory and compounds. As many as 40% of the surveyed students answer that they did not learn about Werner and his compounds. Concrete answered to compound recognition questions are also below the level of faculty knowledge. As a second part of the experimental work, four Werner complex compounds were synthesized according to the available regulation for their preparation: trans- \( \left [ Co\left ( NH_{3} \right )_{4} Cl_{2}\right ]Cl\), cis- \( \left [ Co\left ( NH_{3} \right )_{4} Cl_{2}\right ]Cl\), \( \left [ Co\left ( NH_{3} \right )_{5} Cl_{2}\right ]Cl\) and \( \left [ Co\left ( NH_{3} \right )_{6}\right ] Cl_{3}\). The compounds were characterized by FT-IR analysis and their obtained spectra were compared to each other. Based on the obtained survey results and experimental data for the synthesis of compounds, it is proposed to apply these four compounds in the experimental teaching of chemistry in the form of performing two exercises within 4-6 hours in two practicum terms. In the methodical part of this diploma thesis is the teaching unit: Complex compounds