Tetraammineplatinum(II) chloride monohydrate is primarily used in the field of catalysis, where it serves as a precursor for various platinum-based catalysts. These catalysts are essential in industrial processes such as hydrogenation reactions, where they facilitate the addition of hydrogen to unsaturated organic compounds. Additionally, this compound is utilized in the synthesis of other platinum complexes, which are employed in research and development for creating new materials with specific catalytic properties. In the pharmaceutical industry, it plays a role in the preparation of platinum-containing drugs, which are used in chemotherapy for cancer treatment. Its stability and solubility make it a valuable reagent in laboratory settings for studying coordination chemistry and developing advanced catalytic systems.