Argon

Base Information

• Chemical Name: Argon
• CAS No.: 7440-37-1
• Deprecated CAS: 13473-05-7,137736-93-7,24494-51-7,50938-66-4,75714-55-5,239084-98-1,245503-61-1,137736-93-7,239084-98-1,24494-51-7,245503-61-1,50938-66-4,75714-55-5
• Molecular Formula: Ar
• Molecular Weight: 39.95
• Hs Code.: 2804210000
• European Community (EC) Number: 231-147-0
• ICSC Number: 0154
• UN Number: 1006,1951
• UNII: 67XQY1V3KH
• DSSTox Substance ID: DTXSID3052482,DTXSID30435907,DTXSID90745913,DTXSID40931147
• Nikkaji Number: J1.293I
• Wikipedia: Argon
• Wikidata: Q696
• Mol file: 7440-37-1.mol

Synonyms:Argon;Argon 40;Argon-40

Chemical Property of Argon

Chemical Property:

• Appearance/Colour: colourless odourless gas
• Vapor Pressure: 343000mmHg at 25°C
• Melting Point: -189 ºC
• Boiling Point: -186 ºC
• PSA: 0.00000
• Density: 1.784（0ºC）
• LogP: 0.00000
• Water Solubility.: 33.6mL/1000g H2O (20°C) [KIR78]; Henry’s law constants, k×10?4: 3.974 (25.0°C), 5.359 (65.1°C), 5.342 (91.1°C), 3.812 (222.7°C), 2.541 (267.3°C), 1.870 (287.9°C) [POT78]
• Hydrogen Bond Donor Count: 0
• Hydrogen Bond Acceptor Count: 0
• Rotatable Bond Count: 0
• Exact Mass: 39.96238312
• Heavy Atom Count: 1
• Complexity: 0
• Transport DOT Label: Non-Flammable Gas

Purity/Quality:

98%min ^*data from raw suppliers

Argon ≥99.998% ^*data from reagent suppliers

Safty Information:

• Safety Statements: 38

MSDS Files:

SDS file from LookChem

Total 1 MSDS from other Authors

Useful:

• Chemical Classes: Toxic Gases & Vapors -> Simple Asphyxiants
• Canonical SMILES: [Ar]
• Recent EU Clinical Trials: CardioPulmonary resuscitation with Argon (CPAr) trial
• Recent NIPH Clinical Trials: Efficacy and safety of Anti-reflux mucosal ablation for refractory GERD: Multi-center prospective study.
• Inhalation Risk: On loss of containment this substance can cause suffocation by lowering the oxygen content of the air in confined areas.
• Effects of Short Term Exposure: Asphyxiation. The liquid may cause frostbite.
• Description: Argon belongs to the family of inert, rare gases of the atmosphere. It is plentiful compared to the other rare atmospheric gases; I million ft3 (28 300 m3) of dry air contains 9340 ft3 (264 m3 ) of argon. Argon is colorless, odorless, tasteless, and nontoxic. It is extremely inert and forms no known chemical compounds. It is slightly soluble in water.
• Physical properties: Argon is a colorless, odorless, tasteless, chemically inert noble gas that makes up about0.93% of the Earth’s atmosphere. It is the third most abundant gas in the atmosphere, meaningit is more common than carbon dioxide, helium, methane, and hydrogen. Its melting point is –189.35°C, its boiling point is –185.85°C, and its density is0.0017837g/cm3.
• Uses: Gas as shield in gas metal-arc welding, in metal processing; carrier in gas-liquid and gas-solid chromatography; gas filler for incandescent light bulbs. Gas in fluorescent tubes analogous to neon lights, but produces a blue-purplish light; in rectifier tubes; in thermometers above mercury; in lasers; wherever an inert atmosphere is desired and the much cheaper nitrogen cannot be used; in ionization chambers and particle counters; in mixtures with He and Ne in Geiger counters; in argon-oxygen-decarburizing process for stainless steel; in manufacture of semiconducting devices; in gas mixtures as the working fluid in plasma arc devices. Liquid as cryogen to produce low temperetures. The isotope 40Ar is always found in minerals contg potassium, since it is a product of 40K decay; measuring the amount of 40Ar and 40K can be used for determining the geologic age of minerals and meteors. Argon is used when an inert atmosphere is required. Individually, or as mixture with otherinert gases, it is used to fill electric light bulbs, fluorescent tubes, lasers, and so forth. Byreplacing oxygen in incandescent light bulbs, it prevents oxygen from corroding the bulb’sfilament. It is also used as a nonoxidizing gas for welding and to decarbonize steel and as aninert atmosphere in which to grow semiconductor crystals. Argon is extensively used in filling incandescent and fluorescent lamps, and electronic tubes; as an inert gas shield for arc welding and cutting; as a blanket in the production of titanium, zirconium, and other reactive metals; to flush molten metals to eliminate porosity in castings; and to provide a protective shield for growing silicon and germanium crystals.

Refernces

Electrospray-ionization mass spectrometry for screening the specificity and stability of single-stranded-DNA templated self-assemblies

10.1002/chem.200801506

The research focuses on the use of electrospray-ionization mass spectrometry (ESI-MS) to investigate the specificity and stability of single-stranded-DNA (ssDNA) templated self-assemblies. The study employs ESI-MS to analyze supramolecular complexes formed by oligothymine (dTn) as the host template and guest molecules equipped with a complementary diaminotriazine hydrogen-bonding unit. Argon was used as the collision gas in the mass spectrometer. The experiments involve the systematic variation of template lengths and guest-molecule sizes to assess complex detectability and stability. The analyses include collision-induced-dissociation (CID) experiments to study the relative strength of guest binding to the ssDNA template in the gas phase. The reactants used in these experiments are ssDNA templates of varying lengths (dT5, dT10, dT20, dT40) and guest molecules (G1, G2, G3, G4) with different molecular weights and hydrogen-bonding capabilities. The ESI-MS technique allows for the detection of distinct ssDNA-guest complexes, with the highest complex mass detected being 15 kDa, constituting 20-component self-assembled objects. The article demonstrates that ESI-MS is a powerful tool for analyzing supramolecular ssDNA complexes in detail, providing insights into the binding dynamics and selectivity of these constructs.