NNO3

NNO3 is a chemical notation that in some contexts denotes the salt formed from nitrosonium cation NO+ and nitrate anion NO3−, commonly called nitrosonium nitrate. When written as NO+ NO3−, the compound has an overall neutral charge, and its empirical formula is N2O4. However, NNO3 is not universally standardized, and many sources distinguish explicitly between the salt NO+ NO3− and the neutral molecule N2O4 (dinitrogen tetroxide).

Structure and bonding: In the solid, NNO3 is described as an ionic salt consisting of alternating nitrosonium cations (NO+) and nitrate anions (NO3−). The nitrosonium cation is typically linear, while the nitrate anion is trigonal planar, and the crystal packing follows patterns common to small-ion nitrates.

Preparation and occurrence: NNO3 appears primarily in specialized inorganic or theoretical literature. It is discussed as a salt that can form under controlled conditions when nitrosonium sources are brought into contact with nitrate sources, with stability highly dependent on the environment, moisture, and counterions. The compound tends to be sensitive to conditions that promote decomposition.

Properties: As a nitrate-based oxidizing salt, NNO3 is highly reactive and may decompose under heat or mechanical shock. It should be handled away from organic materials, reducing agents, and moisture. Specific properties such as melting point, volatility, and exact decomposition pathways vary with preparation method and crystal form.

Applications: The notation and compound are mainly of academic interest, contributing to discussions of nitrosonium chemistry, nitrate salts, and related ionic species rather than having widespread practical use.

Safety: NNO3 is a strong oxidizer with potential health and environmental hazards. It can release nitrogen oxides on decomposition and should be handled with appropriate inert-atmosphere precautions and protective equipment.

See also: Nitrosyl nitrate; Dinitrogen tetroxide; Nitrates.