127323-69-7

Basic information

• Product Name: arsonium
• Synonyms: arsanylium; dihydridoarsenic(1+)
• CAS NO: 127323-69-7
• Molecular Formula: H₄As
• Molecular Weight: 78.9528
• Mol File: 127323-69-7.mol
• Article Data: 20

Chemical Properties

• Vapor Pressure: 13300mmHg at 25°C
• CAS DataBase Reference: arsonium(CAS DataBase Reference)
• NIST Chemistry Reference: arsonium(127323-69-7)
• EPA Substance Registry System: arsonium(127323-69-7)

Safety Data

• Hazardous Substances Data: 127323-69-7(Hazardous Substances Data)

Upstream product

• 7784-34-1 arsenic trichloride 
• 7439-95-4 magnesium 
• 7778-39-4 orthoarsenic acid 
• 60189-99-3 sodium dihydrogenarsenite 
• 1333-74-0 hydrogen 
• 13464-58-9 arsenous acid 
• 12044-25-6 sodium arsenide 
• 7732-18-5 water 
• 64-19-7 acetic acid 
• 7647-01-0 hydrogenchloride 
• 13768-07-5 arsinic acid 
• 33756-41-1 potassium hydrogen arsenide 

Downstream Products

• 13464-58-9 arsenous acid 

Relevant articles and documents

Acidity, basicity, and ion-molecule reactions of arsine in the gas phase by ion cyclotron resonance spectroscopy

The ion-molecule reactions of arsine, both in pure form and in binary mixtures with several other molecules, have been investigated by ion cyclotron resonance spectroscopy. Reaction pathways, product distributions, and rate constants have been determined for ion-molecule reactions of both positive and, to a lesser extent, negative ions. Rate constants are determined by examining variation of ion abundance with both pressure and time, the latter experiments utilizing trapped ion techniques. Arsine fragment ions condense with neutral AsH3 to generate product ions containing two and, on further reaction, three atoms af arsenic. In the process of condensation, one or two molecules of H2 are expelled. The formation of AsH4+ occurs from AsH3+ which does not undergo condensation reactions to any significant extent. Where possible, thermochemical data have been determined, including the gas-phase acidity, PA(AsH2-) = 360 ± 10 kcal/mol, and basicity, PA(AsH3) = 175 ± 5 kcal/mol, of AsH3. Observation of gas-phase nucleophilic displacement reactions involving AsH3 as a nucleophile have allowed limits to be placed on the basicity of AsH3 toward a soft acid, CH3+. The implications of these results are discussed and the ion-molecule reactions of AsH3 are compared with those of other hydrides.

Electrochemical preparation of H2S and H2Se

H2S and H2Se have been electrolytically prepared by electrolysis in aqueous H2SO4 solutions of composite cathodes made of S or Se and graphite. The efficiencies depended strongly on the electrolyte composition, in particular on the acid concentration and presence of K+. Faradaic efficiencies of 80% were obtained in dilute (0.05 M) acid, and this increased to 100% with added K2SO4. The efficiencies dropped drastically in concentrated acid (>a few moles). H 2Te and AsH3 generation were also briefly studied for comparison. The mechanisms of hydride formation are discussed. Both the reaction of nascent hydrogen with the free element and direct reduction of the element are considered. The latter is believed to be the dominant mechanism.

Ba11KX7O2 (X = P, AS): Two novel zintl phases with infinite chains of oxygen centered Ba6 octahedra, isolated X3- and dimeric X24- anions

Reactions of BaX (X = P, As) with Ba, K and BaO in tantalum tubes at 900-1000°C yielded black, very air-and moisture-sensitive crystals of Ba11KP7O2 and isotypic Ba11KAs7O2 which were characterized by EDX and X-ray diffraction (orthorhombic, Fddd, Z = 8; a = 1069.9(1), b = 1514.3(2), c = 3164.6(4) pm and a = 1087.8(2), b = 1542.3(2), c = 3232.4(4) pm, respectively). The structure contains infinite zigzag chains, 1∞[Ba4Ba2/2O], of oxygen-centered, corner-sharing Ba6 octahedra along [100]. They are connected by linear strings built of alternating isolated X atoms and X2 dimers to form layers parallel to (001). While the isolated X atoms are surrounded by eight Ba forming a distorted cube, the X2 dimers center a Ba12 polyhedron which is comprised of a pair of face-sharing Ba square antiprisms. This results in a cube-antiprism-antiprism-cube sequence of face-sharing Ba polyhedra. Additional X atoms function as spacers between the layers and connect them along [001]. Two atom positions are statistically occupied by Ba and K, and the formula may be written as Ba2+11K+X3-5(X 2)4-O2-2 according to the Zintl-Klemm concept.

GASEOUS DIELECTRICS WITH LOW GLOBAL WARMING POTENTIALS

A dielectric gaseous compound which exhibits the following properties: a boiling point in the range between about ?20° C. to about ?273° C.; non-ozone depleting; a GWP less than about 22,200; chemical stability, as measured by a negative standard enthalpy of formation (dHf0); a toxicity level such that when the dielectric gas leaks, the effective diluted concentration does not exceed its PEL; and a dielectric strength greater than air.

Laser spectroscopy and dynamics of the jet-cooled AsH2 free radical

The A2A1-X2B1 electronic transition of the jet-cooled AsH2 free radical has been studied by laser-induced fluorescence (LIF), wavelength-resolved emission, and fluorescence lifetime measurements. The radical was produced by a pulsed electric discharge through a mixture of arsine (AsH3) and high pressure argon at the exit of a pulsed valve. Nine vibronic bands wereidentified by LIF spectroscopy in the 505-400 nm region, including a lo ng progression in the bending mode and two bands (101 and 101201) involving the excited state As-H symmetric stretch. Single vibronic level emission spectra showed similar activity in the bending and symmetric stretching frequencies of the ground state. High-resolution spectra of the 000 band exhibited large spin splittings and small, resolved arsenic hyperfine splittings, due to a substantial Fermi contact interaction in the excited state. The rotational constants obtained in the analysis gave effective molecular structures of r″0 = 1.5183(1) ?, θ″0=90.75(1) ° and r′0=1.4830(1) ?, θ′0= 123.10(2)°. The excited state fluorescence lifetimes vary dramatically with rovibronicstate, from a single value of 1.4 μs to many with lifetimes less tha n 10 ns, behavior which the authors interpret as signaling the onset of a predissociative process near the zero-point level of the ground state.