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Ruthenium nitrosyl nitrate, commonly denoted as Ru(NO)(NO3)3, is a coordination complex that contains a ruthenium (Ru) atom coordinated with one nitrosyl (NO) ligand and three nitrate (NO3) ligands. This complex has diverse applications, particularly in catalysis and as a starting material for the synthesis of various ruthenium-containing compounds.One prominent application of ruthenium nitrosyl nitrate is in the field of homogeneous catalysis. The Ru(NO)(NO3)3 complex serves as a catalyst in a range of chemical transformations, including hydrogenation, oxidation, and nitrogen fixation reactions. For example, in the context of hydrogenation, this complex has been shown to catalyze the reduction of alkenes, ketones, and nitro compounds. Its catalytic activity in hydrogenation reactions stems from its ability to coordinate and activate molecular hydrogen, facilitating the transfer of hydrogen atoms to the substrate.Additionally, ruthenium nitrosyl nitrate is used as a precursor for the synthesis of other ruthenium complexes with specific catalytic properties. By subjecting Ru(NO)(NO3)3 to various ligand exchange reactions, different ligands can be introduced, leading to the formation of complexes with tailored reactivity and selectivity. These modified ruthenium complexes can find application in processes such as olefin metathesis, carbon-carbon bond activation, and water splitting for hydrogen production.The unique electronic and redox properties of ruthenium nitrosyl nitrate make it suitable for catalyzing oxidation reactions. This complex has been employed in the aerobic oxidation of alcohols to aldehydes or ketones, as well as in the oxidation of various organic substrates, including amines, phenols, and sulfides. In these reactions, the ruthenium center facilitates electron transfer to activate molecular oxygen, promoting the oxidation process.Furthermore, ruthenium nitrosyl nitrate has shown potential in nitrogen fixation reactions, wherein atmospheric nitrogen is converted into useful, reactive nitrogen species. The unique combination of ruthenium and nitrosyl ligands allows for the activation of nitrogen molecules and their subsequent transformation into ammonia or other nitrogen-containing compounds. Nitrogen fixation is of great importance in the production of fertilizers and plays a crucial role in addressing global food security.In summary, ruthenium nitrosyl nitrate is a versatile complex with diverse applications in catalysis, particularly in hydrogenation, oxidation, and nitrogen fixation reactions. Its ability to activate molecular hydrogen and perform ligand exchange reactions contributes to its usefulness as a starting material for the synthesis of other ruthenium complexes with tailored reactivity. The unique properties of ruthenium nitrosyl nitrate make it valuable in the development of efficient catalytic processes and the production of valuable chemical compounds.