Manganese(VII) oxide is Mn₂O₇. This material is highly reactive and more often discussed than observed or intentionally prepared. It is considered to be a dangerous oxidizer. IUPAC nomenclature is a system of naming chemical compounds and of describing the science of chemistry in general. ... A chemical formula (also called molecular formula) is a concise way of expressing information about the atoms that constitute a particular chemical compound. ... The simplified molecular input line entry specification or SMILES is a specification for unambiguously describing the structure of chemical molecules using short ASCII strings. ... Molar mass is the mass of one mole of a chemical element or chemical compound. ... CAS registry numbers are unique numerical identifiers for chemical compounds, polymers, biological sequences, mixtures and alloys. ... Density (symbol: ρ - Greek: rho) is a measure of mass per unit of volume. ... In the physical sciences, a phase is a set of states of a macroscopic physical system that have relatively uniform chemical composition and physical properties (i. ... A substance is soluble in a fluid if it dissolves in that fluid. ... Water (H2O, HOH) is the most abundant molecule on Earth, composing 70-75% of the Earths surface as liquid and solid state in addition to being found in the atmosphere as a vapor. ... The melting point of a solid is the temperature at which it changes state from solid to liquid. ... The boiling point of a substance is the temperature at which it can change its state from a liquid to a gas throughout the bulk of the liquid at a given pressure. ... The coordination geometry of an atom is the geometrical pattern formed by its neighbors in a molecule or a crystal. ... Rose des Sables (Sand Rose), formed of gypsum crystals In mineralogy and crystallography, a crystal structure is a unique arrangement of atoms in a crystal. ... A material safety data sheet or MSDS is a form containing data regarding the properties of a particular substance. ... Worker safety and health is the prevention and reduction of the number of occupational safety and health hazards at the places of employment, providing safe and healthful working conditions. ... NFPA 704 is a standard maintained by the U.S. National Fire Protection Association. ... Risk and Safety Statements, also known as R/S statements, R/S numbers, R/S phrases, and R/S sentences, is a system of hazard codes and phrases for labeling dangerous chemicals and compounds. ... R-phrases are defined in Annex III of European Union Directive 67/548/EEC: Nature of special risks attributed to dangerous substances and preparations. ... S-phrases are defined in Annex IV of European Union Directive 67/548/EEC: Safety advice concerning dangerous substances and preparations. ... RTECS, also known as Registry of Toxic Effects of Chemical Substances, is a database of toxicity information compiled from the open scientific literature that is available for charge. ... The refractive index (or index of refraction) of a material is the factor by which the phase velocity of electromagnetic radiation is slowed in that material, relative to its velocity in a vacuum. ... The dielectric constant εr (represented as or K in some cases) is defined as the ratio: where εs is the static permittivity of the material in question, and ε0 is the vacuum permittivity. ... Ultraviolet-Visible Spectroscopy or Ultraviolet-Visible Spectrophotometry (UV/ VIS) involves the spectroscopy of photons (spectrophotometry). ... IR spectrum of a thin film of liquid ethanol. ... Nuclear Magnetic Resonance Spectroscopy most commonly known as NMR Spectroscopy is the name given to the technique which exploits the magnetic properties of nuclei. ... Basic schematic of mass spectrometry Mass spectrometry is an analytical technique used to measure the mass-to-charge ratio of ions. ... Potassium permanganate is the chemical compound KMnO4. ... In chemistry, the standard state of a material is its state at 1 bar (100 kilopascals) and 25 degrees Celsius (298. ...

Key properties

The crystalline compound is green to reflected light and red to transmitted light. It is soluble in CCl₄, melts at only 5.9 °C, and sublimes at -10 °C. These properties indicate a nonpolar molecular species, which is confirmed by its structure. The molecules consist of a pair of tetrahedra that share a common vertex. The vertices are occupied by oxygen atoms and at the centers of the tetrahedra are the Mn(VIII) centers. The connectivity is indicated by the formula O₃Mn-O-MnO₃. The terminal Mn-O distances are 1.585 Å and the bridging oxygen is 1.77 Å distant from the two Mn atoms. The Mn-O-Mn angle is 120.7°.

Pyrosulfate, pyrophosphate, and dichromate adopt similar structures to Mn₂O₇. Probably the most similar main group species is Cl₂O₇. Focusing on comparisons within the transition metal series, Tc₂O₇ and Mn₂O₇ are structurally similar but the Tc-O-Tc angle is 180°. Re₂O₇ is not molecular but consists of crosslinked Re centers with both tetrahedral and octahedral sites.

One distinction of Mn₂O₇ is that it is charge-neutral. Molecular oxides that are neutral or cationic are typically good oxidants.

Synthesis and reactions

Mn₂O₇ arises as a green oil by the addition of H₂SO₄ to KMnO₄. Upon dissolution in H₂SO₄, Mn₂O₇ loses water to give the remarkable cation MnO₃⁺, which is isoelectronic with CrO₃. Sulfuric acid (British English: sulphuric acid), H2SO4, is a strong mineral acid. ... Potassium permanganate is the chemical compound KMnO4. ... Sulfuric acid (British English: sulphuric acid), H2SO4, is a strong mineral acid. ... In chemistry, chromic acid (or Jones reagent) is a chromium (Cr) compound, yet to be isolated, that would have the formula H2CrO4. ...

Mn₂O₇ decomposes near room temperature, explosively so at >55 °C. The explosion can be initiated by striking the sample or by its exposure to oxidizable organic compounds. The products are MnO₂ and O₂.

Further reading

• Overview: Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
• Structure: Simon, A.; Dronskowski, R.; Krebs, B.; Hettich, B. "Die Kristallstruktur von Mn₂O₇" Angewandte Chemie 1987, volume 99, pages 160 - 161. See also: Krebs, B.; Mueller, A.; Beyer, H. H. The Crystal Structure of Rhenium(VII) Oxide" Inorganic Chemistry 1969, 8, 436-443.
• Discovery: Aschoff, H. Ann. Phys. Chem. Ser. 2 volume 111 (1860) page 217 and page 224.

External links

• Link page to external chemical sources.