Ruthenium nitrosyl nitrate
[CAS# 34513-98-9]

Identification

• Classification: Food additive >> Nutrition supplements >> Inorganic salts
• Name: Ruthenium nitrosyl nitrate
• Synonyms: Tris(nitrato-O)nitrosylruthenium
• Molecular Formula: N₄O₁₀Ru
• Molecular Weight: 317.09
• CAS Registry Number: 34513-98-9
• EC Number: 252-068-8
• SMILES: O=N[Ru+3].O=[N+]([O-])[O-].O=[N+]([O-])[O-].O=[N+]([O-])[O-]

Properties

• Density: 1.07 g/mL (25 °C) (Expl.)

Safety Data

• Hazard Symbols: GHS03;GHS05 Danger
• Risk Statements: H272-H290-H314
• Safety Statements: P221-P210-P303+P361+P353-P305+P351+P338-P40-P501

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Substances or mixtures corrosive to metals	Met. Corr.	1	H290
Skin corrosion	Skin Corr.	1B	H314
Serious eye damage	Eye Dam.	1	H318
Chronic hazardous to the aquatic environment	Aquatic Chronic	2	H411
Oxidising solids	Ox. Sol.	1	H271
Oxidising liquids	Ox. Liq.	1	H271
Oxidising solids	Ox. Sol.	2	H272
Skin corrosion	Skin Corr.	1A	H314

Discovery and Applications

Ruthenium nitrosyl nitrate is an inorganic coordination compound consisting of ruthenium coordinated to a nitrosyl (NO) ligand and nitrate ions. This complex typically features ruthenium in a positive oxidation state, with the nitrosyl ligand acting as a strong field ligand bonded to the metal center through the nitrogen atom. The nitrate ions serve as counterions or may participate in coordination depending on the compound's structure and synthesis conditions.

The nitrosyl ligand is notable for its ability to adopt various bonding modes and electronic configurations, which can significantly influence the properties of the ruthenium center. In ruthenium nitrosyl nitrate, the NO ligand usually coordinates linearly to the ruthenium atom, forming a metal-nitrosyl bond characterized by strong π-backbonding from the metal d orbitals to the π* orbitals of NO. This bonding interaction affects the electronic structure and reactivity of the complex.

Ruthenium nitrosyl nitrate can be synthesized by reacting ruthenium precursors, such as ruthenium trichloride or ruthenium tetroxide, with nitric acid or nitrate salts under controlled conditions. The formation of the nitrosyl ligand often involves the reduction of nitrogen oxides or the direct introduction of NO gas during the reaction. The resulting complex can be isolated as a solid, typically exhibiting characteristic spectral features due to the nitrosyl and nitrate ligands.

The compound has been studied for its chemical behavior, including its redox properties and reactivity with various ligands. Ruthenium nitrosyl complexes are known for their potential applications in catalysis, including oxidation and reduction reactions, due to the versatile coordination chemistry of ruthenium and the electron-donating and accepting capabilities of the nitrosyl ligand.

Additionally, nitrosyl ruthenium complexes have been investigated for their roles as nitric oxide donors in biological systems. Nitric oxide is an important signaling molecule in physiology, and ruthenium nitrosyl compounds can serve as controlled NO-release agents, with potential applications in medicine such as vasodilation and modulation of cellular processes.

Physically, ruthenium nitrosyl nitrate compounds are typically crystalline solids with varying solubility depending on their precise composition and hydration state. Analytical techniques such as infrared (IR) spectroscopy reveal characteristic NO stretching frequencies, which provide information on the bonding mode of the nitrosyl ligand. UV-visible spectroscopy and nuclear magnetic resonance (NMR) can also be used to study the electronic environment and confirm the structure of the complex.

Safety considerations include handling ruthenium compounds with care due to their potential toxicity and environmental impact. Proper laboratory procedures should be followed to minimize exposure and ensure safe disposal.

In summary, ruthenium nitrosyl nitrate is a coordination compound featuring a ruthenium center bonded to a nitrosyl ligand and nitrate ions. Its unique bonding and electronic properties make it a subject of interest in catalysis, materials science, and biomedical research, particularly related to nitric oxide delivery and coordination chemistry.

References

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