Used primarily in research and development involving rhenium-based catalysts, especially in hydrogenation and dehydrogenation reactions. It serves as a precursor for synthesizing other rhenium compounds used in high-temperature materials and electronic components. Also explored in electrochemical applications due to its redox activity and stability in chloride-rich environments. Limited industrial use due to the rarity and cost of rhenium, but valuable in specialized laboratory settings for studying transition metal chloro-complexes.