Potassium tetrachloroplatinate (II) is primarily used in the synthesis of platinum-based compounds and catalysts. It serves as a key precursor in the preparation of other platinum complexes, which are widely employed in industrial catalytic processes, including hydrogenation and oxidation reactions. In the field of materials science, it is utilized to produce platinum coatings and nanoparticles, which have applications in electronics, sensors, and fuel cells. Additionally, it plays a role in analytical chemistry as a reagent for platinum determination and in research laboratories for studying coordination chemistry and metal-ligand interactions.