Tetrasilver Tetroxide (Ag₄O₄)

Tetrasilver tetroxide is the inorganic compound with the formula Ag₄O₄, also written Ag(I)Ag(III)O₂ or Ag₂O·Ag₂O₃. It is a mixed-valence silver oxide: each formula unit contains two monovalent silver ions and two trivalent silver ions. It is a dark brown-to-grey-black diamagnetic solid, a component of silver–zinc batteries, and a strong oxidizer. It is the subject of the Marvin Antelman patent family collected in the source archive TSTO dossier, and is associated in the source dossiers with the chemist and inventor Marvin S. Antelman. It is the central subject of the TSTO sales-and-patent material, including the capture recorded at Tetrasilver Tetroxide: A Third source Capture (Variant Record).

The source dossier also presents the material as an "electron jumping compound" and "molecular battery" sold as a technical-grade powder. The source links to the Wikipedia article on silver(I,III) oxide for the material's general description but supplies no synthesis route, purity specification, particle-size data, or characterization of the material actually sold.

Identity and nomenclature

The compound has accumulated many names, which the dossier lists explicitly: silver(II) oxide, silver(I,III) oxide, argentic oxide, Tetrasil, Sildate, Divasil, silver peroxide, silver suboxide, divalent silver oxide, mono-trivalent silver oxide, and tetrasilver tetroxide.

Two of these names are considered incorrect. "Silver peroxide" is wrong because the compound contains no peroxide ion, O₂²⁻. "Silver(II) oxide" is misleading because the silver is not uniformly divalent; David Tudela's 2008 J. Chem. Educ. paper argues that the mixed-valence silver(I,III) oxide is more stable than a hypothetical silver(II) oxide. See Silver(III) Chemistry.

The dossier warns explicitly that Ag₄O₄ is not to be confused with Ag₂O (silver(I) oxide, CAS 20667-12-3, molar mass 231.74, density 7.14, melting point 280 °C, photosensitive).

The compound is described in the dossier as a silver oxide in which silver appears in more than one oxidation state within a single lattice, distinguishing it from ordinary silver(I) oxide. The mixed-valence framing is treated on Mixed-Valence Silver Oxide and Silver(I,III) Oxide. This identity claim is a source assertion carried by the dossier and the cited patents.

Physical and chemical properties

PubChem lists the molecular formula as Ag₄O₄⁴⁻ with a formal charge of −4, a heavy atom count of 8, and a covalently-bonded unit count of 8. The IUPAC name is given as "tetrasilver;oxygen(2-)" and the canonical SMILES as [O-2].[O-2].[O-2].[O-2].[Ag+].[Ag+].[Ag+].[Ag+].

The compound is a strong oxidizer, corrosive to metals, and non-flammable. It ignites on contact with sulfur, red phosphorus, and sulfides of antimony and arsenic, and will ignite inflammable substances. It reacts explosively with ammonia and hydrogen peroxide, forming silver powder and oxygen. It should be stored below 100 °C.

Structure

X-ray diffraction shows the silver atoms adopt two different coordination environments: one with two collinear oxide neighbours and one with four coplanar oxide neighbours. The compound is diamagnetic, which is inconsistent with a simple Ag(II) formulation. It has been formulated as Ag(I)Ag(III)O₂ or Ag₂O·Ag₂O₃.

Preparation

The classical preparation (Hammer & Kleinberg, Inorganic Syntheses IV:12) oxidizes silver(I) nitrate with potassium peroxydisulfate in alkaline medium:

72 g NaOH (1.8 mol) in 1 L water at ~85 °C
+ 75 g potassium peroxydisulfate (0.28 mol) as an aqueous slurry
+ 51 g AgNO3 (0.30 mol) in minimum water
Raise to 90 °C; stir ~15 minutes
Filter the black precipitate; wash with slightly alkaline water
Air-dry. Yield 35 g (94%)
Analysis: calculated Ag 87.08%; found 86.93%, 86.90%

Antelman's modified procedure (Precious Metals 16:141–149, 1992) uses a stock of 24.0 g K₂S₂O₈ plus 24.0 g NaOH diluted to 500 mL, added to silver nitrate aliquots containing 1.0 g of silver, held at 90 °C for 15 minutes, then washed and decanted four times. The commercial comparison material was Johnson Matthey / Aesar product code 11607, 99.9% purity.

The reaction sequence, from the dossier's informal preparation write-up:

Ag+ + S2O8^2-  →  Ag3+ + 2 SO4^2-
4 Ag3+ + 6 H2O  →  2 Ag(I)Ag(III)O2 + 12 H+ + O2
4 Ag3+ + 12 OH-  →  2 Ag(I)Ag(III)O2 + 6 H2O + O2
2 Ag(I)Ag(III)O2  →  2 Ag(I)2O + O2

Regulatory status

Ag₄O₄ is registered with the U.S. EPA as a swimming pool water disinfectant (the SILDATE product is EPA Reg. No. 3432-AU / 00343200064, 2% active ingredient, toxicity Category III "Caution"; the dossier also lists EPA Registration Number 3432-64). It is applied at 1 ppm with a potassium persulfate activator. See Persulfate Activation.

In 2010 the FDA issued a warning letter to Aidance Skincare and Topical Solutions, LLC concerning the marketing of Tetrasil and Genisil ointments of tetrasilver tetroxide for herpes and similar conditions.

Claimed mechanism

The dossier attributes to TSTO the behavior of an "electron-jumping compound" or "molecular battery" — a material said to release electrons that disrupt microbial metabolism. The wiki records this as a claim rather than an established electrochemical result; see Electron Jumping Compound / Molecular Battery Claim.

Properties claimed on the sales page

The source archive sales page attributes the following properties to TSTO:

• Acts as a "molecular battery" or "electron jumping compound," releasing electrons through a reduction/oxidation process.
• "Does not stain organic matter."
• "Light stable."
• "Must be syringe-filtered for injection."
• Requires activation by an oxidizing agent such as Oxone or hydrogen peroxide — the page states the crystals "will not do so unless activated."

The activation requirement is the most consequential stated property: it contradicts a naive reading of the "self-contained molecular battery" framing, since the material does not release its electrons without a co-reactant.

Claimed applications

Antimicrobial action and water disinfection are the principal uses asserted in the dossier, with broader therapeutic assertions also present. These connect to Antimicrobial Silver and the Oligodynamic Effect and Water Disinfection by Silver. No controlled trial, independent replication, or measured performance data appears in the supplied material, and a patent is not proof of effectiveness — see Patent as Evidence.

Quantitative claims

The per-molecule figure is derived in the quoted patent text from P = EI using a 2.0 V potential and a 1.6 × 10⁻¹⁹ coulomb electron charge, doubled for two electrons. The "~10 kv" headline and the "4.0 volts × ppm × 5" formula are not derived or reconciled anywhere in the source.

Reported antimicrobial concentrations (patent excerpts)

Toxicity profile quoted on the page

No test species, laboratory, method, or date accompanies these values.

Commercial listing

Sold by the source archive as a technical-grade powder: 1 gram / $40, 3 grams / $80, 30 grams / $440, with a "TSTO Database" on a USB flash drive, USPS Priority Mail, USA only. Labeled "Technical Grade — Not For Human Use."

Evidentiary status

All efficacy and safety figures in the "Properties claimed on the sales page," "Claimed mechanism," "Claimed applications," "Quantitative claims," "Reported antimicrobial concentrations," and "Toxicity profile" sections above are attributed claims from the sales page or from patents it quotes. The source reports no independent testing, no controls, and no peer-reviewed data. See Tetrasilver Tetroxide: The Electron-Jumping Claim, the Patent Set and the Bounded Evidence.

The available evidence in the capture at [source note 3] is patent text and promotional material. The dossier mixes sales language with technical language, blurring the boundary between marketing claim and technical claim. Claims about efficacy should be read as attributed assertions, not as verified results.

Related pages

• Marvin Antelman
• Molecular Crystal Device (Electron Jumping Compound)
• Silver(III) Chemistry
• Persulfate Activation
• Tetrasilver Tetroxide: The Electron-Jumping Claim, the Patent Set and the Bounded Evidence
• Silver(I,III) Oxide
• Marvin S. Antelman
• Electron Jumping Compound / Molecular Battery Claim
• Mixed-Valence Silver Oxide
• Antimicrobial Silver and the Oligodynamic Effect
• Water Disinfection by Silver
• Patent as Evidence