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Arsine
Arsine
IUPAC name arsenic trihydride
arsane
trihydridoarsenic
Other names arseniuretted hydrogen; arsenous hydride; hydrogen arsenide
Identifiers
CAS number [7784-42-1]
Properties
Molecular formula AsH3
Molar mass 77. IUPAC Nomenclature is a system of naming Chemical compounds and of describing the science of Chemistry in general CAS registry numbers are unique numerical identifiers for Chemical compounds Polymers biological sequences mixtures and Alloys They are also referred to A chemical formula is a way of expressing information about the Atoms that constitute a particular Chemical compound, and how the relationship between those atoms changes Molar mass, symbol M, is the Mass of one mole of a substance ( Chemical element or Chemical compound) 95 g/mol
Appearance colourless gas
Density 4. The density of a material is defined as its Mass per unit Volume: \rho = \frac{m}{V} Different materials usually have different 93 g/l, gas; 1. 640 g/mL (−64 °C)
Melting point

−117 °C (157 K)
Boiling point

−62. The melting point of a solid is the temperature range at which it changes state from solid to Liquid. The boiling point of a liquid is the temperature at which the Vapor pressure of the liquid equals the environmental pressure surrounding the liquid 5 °C (210 K)
Solubility in water 0. Solubility is the characteristic Physical property referring to the ability of a given substance the Solute, to dissolve in a Solvent. Water is a common Chemical substance that is essential for the survival of all known forms of Life. 07 g/100 ml (25 °C)
Structure
Molecular shape trigonal pyramidal
Dipole moment 0. Molecular geometry or molecular structure is the three- Dimensional arrangement of the Atoms that constitute a Molecule. In physics there are two kinds of dipoles ( Hellènic: di(s- = two- and pòla = pivot hinge An electric dipole is a 20 D
Thermochemistry
Std enthalpy of
formation ΔfHo298		 +66. The debye (symbol D) is a non- SI, CGS unit of electrical dipole moment. The standard enthalpy of formation or "standard heat of formation" of a compound is the change of Enthalpy that accompanies the formation of 1 mole of a 4 kJ/mol
Standard molar
entropy So298		 223 kJ. In Chemistry, the standard molar entropy is the Entropy content of one mole of substance under standard conditions (not standard temperature and pressure K−1. mol−1
Hazards
MSDS External MSDS
EU classification Very flammable; Highly toxic; Dangerous for the environment
NFPA 704
4
4
2
 
R-phrases R12, R26, R48/20, R50/53
S-phrases (S1/2), S9, S16, S28, S33, S36/37, S45, S60, S61
Flash point flammable gas
Related compounds
Related hydrides Ammonia; Phosphine; Stibine; Bismuthine
Supplementary data page
Structure and
properties		 n, εr, etc. A material safety data sheet ( MSDS) is a form containing data regarding the properties of a particular substance and save the page --> This page provides supplementary chemical data on Arsine Council Directive 67/548/EEC of 27 June 1967 on the approximation of laws regulations and administrative provisions relating to the classification packaging and labelling Symbolism The four divisions are typically color-coded with blue indicating level of Health Hazard, red indicating R-phrases (short for Risk Phrases) are defined in Annex III of European Union Directive 67/548/EEC: Nature of special risks attributed to dangerous R-phrases (short for Risk Phrases) are defined in Annex III of European Union Directive 67/548/EEC: Nature of special risks attributed to dangerous R-phrases (short for Risk Phrases) are defined in Annex III of European Union Directive 67/548/EEC: Nature of special risks attributed to dangerous R-phrases (short for Risk Phrases) are defined in Annex III of European Union Directive 67/548/EEC: Nature of special risks attributed to dangerous R-phrases (short for Risk Phrases) are defined in Annex III of European Union Directive 67/548/EEC: Nature of special risks attributed to dangerous S-phrases are defined in Annex IV of European Union Directive 67/548/EEC: Safety advice concerning 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. S-phrases are defined in Annex IV of European Union Directive 67/548/EEC: Safety advice concerning 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. S-phrases are defined in Annex IV of European Union Directive 67/548/EEC: Safety advice concerning 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. S-phrases are defined in Annex IV of European Union Directive 67/548/EEC: Safety advice concerning 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. S-phrases are defined in Annex IV of European Union Directive 67/548/EEC: Safety advice concerning 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. The flash point of a flammable liquid is the lowest Temperature at which it can form an ignitable mixture in air Hydride is the name given to the negative Ion of Hydrogen, H− Ammonia is a compound with the formula N[[hydrogen H3]] It is normally encountered as a Gas with a characteristic pungent Odor Phosphine is the common name for phosphorus hydride (PH3 also known by the IUPAC name phosphane and occasionally phosphamine. Stibine is the Chemical compound with the formula SbH3 This colourless gas is the principal Covalent hydride of Antimony and a heavy analogue Bismuthine is the Chemical compound with the formula BiH3 As the heaviest analogue of Ammonia, BiH3 is unstable decomposing to Bismuth and save the page --> This page provides supplementary chemical data on Arsine and save the page --> This page provides supplementary chemical data on Arsine The refractive index (or index of Refraction) of a medium is a measure for how much the speed of light (or other waves such as sound waves is reduced inside the medium Measurement The relative static permittivity εr can be measured for static Electric fields as follows first the Capacitance of a test
Thermodynamic
data		 Phase behaviour
Solid, liquid, gas
Spectral data UV, IR, NMR, MS
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)
Infobox disclaimer and references

Arsine is the chemical compound with the formula AsH3. and save the page --> This page provides supplementary chemical data on Arsine and save the page --> This page provides supplementary chemical data on Arsine Ultraviolet-visible spectroscopy or ultraviolet-visible spectrophotometry ( UV/ VIS) involves the Spectroscopy of Photons in the UV-visible Infrared spectroscopy (IR spectroscopy is the subset of Spectroscopy that deals with the Infrared region of the Electromagnetic spectrum. Nuclear magnetic resonance spectroscopy, most commonly known as NMR spectroscopy, is the name given to a technique which exploits the magnetic properties of certain nuclei Mass spectrometry is an analytical technique that identifies the chemical composition of a compound or sample based on the Mass-to-charge ratio of charged particles In Chemistry, the standard state of a material is its state at 1 bar (100 Kilopascals exactly A chemical compound is a substance consisting of two or more different elements chemically bonded together in a fixed proportion by Mass. A chemical formula is a way of expressing information about the Atoms that constitute a particular Chemical compound, and how the relationship between those atoms changes Arsenic (ˈɑrsənɪk is a Chemical element that has the symbol As and Atomic number of 33 Hydrogen (ˈhaɪdrədʒən is the Chemical element with Atomic number 1 This flammable, pyrophoric, and highly toxic gas is the simplest compound of arsenic. A pyrophoric substance will ignite spontaneously that is its Autoignition temperature is below Room temperature. Aside from its lethality, it finds applications in the semiconductor industry and for the synthesis of organoarsenic compounds. An organoarsenic compound in Organic chemistry is an Organic compound containing a Chemical bond between Arsenic and Carbon. [1]

Contents

General properties

At its standard state, arsine is a colorless, denser-than-air gas that is soluble in water (200 mL/L) and in many organic solvents as well. Water ( H2[[oxygen O]] H OH) is the most abundant Molecule on Earth 's surface composing of about 70% of the Earth's surface as A solvent is a liquid or gas that dissolves a solid liquid or gaseous Solute, resulting in a Solution. Whereas arsine itself is odorless, owing to its oxidation by air it is possible to smell a slight, garlic-like scent when the compound is present at about 0. Allium sativum L, commonly known as garlic, is a species in the Onion family Alliaceae. 5 ppm. "Parts-per" notation is used especially in Science and Engineering, to denote Ratios (relative proportions in measured quantities particularly This compound is generally regarded as stable, since at room temperature it decomposes only slowly. At temperatures of ca. 230 °C decomposition to arsenic and hydrogen is rapid. Several factors, such as humidity, presence of light and certain catalysts (namely aluminium) facilitate the rate of decomposition. Humidity is the amount of water vapor in the air In daily language the term "humidity" is normally taken to mean Relative humidity. Catalysis is the process in which the rate of a Chemical reaction is increased by means of a Chemical substance known as a catalyst WikipediaNaming [1]

AsH3 is a pyramidal molecule with H–As–H angles of 91. 8° and three equivalent As–H bonds, each of 1. 519 Å length. An ångström or angstrom (symbol Å) (ˈɔːŋstrəm Swedish: ˈɔ̀ŋstrœm is an internationally recognized non- SI unit of length equal The term arsine is commonly used to describe a class of organoarsenic compounds of the formula AsH3−xRx, where R = aryl or alkyl. In the context of organic molecules aryl refers to any Functional group or Substituent derived from a Simple aromatic ring, may it be Phenyl An alkyl is a Univalent radical consisting of Carbon and Hydrogen atoms arranged in a chain For example, As(C6H5)3, called triphenylarsine, is referred to as "an arsine. Triphenylarsine is the Chemical compound with the formula As(C6H53 "


Discovery and synthesis

AsH3 is generally prepared by the reaction of As3+ sources with H− equivalents. [2][3]

4 AsCl3 + 3 NaBH4 → 4 AsH3 + 3 NaCl + 3 BCl3

This type of reaction was employed in the discovery of arsine as reported in 1775 by Carl Scheele who reduced arsenic(III) oxide with zinc in the presence of acid. Year 1775 ( MDCCLXXV) was a Common year starting on Sunday (link will display the full calendar of the Gregorian calendar (or a Carl Wilhelm Scheele (9 December 1742 &ndash 21 May 1786 was a German - Swedish pharmaceutical chemist born in Stralsund, Western Pomerania, Arsenic trioxide is the most important commercial compound of Arsenic, and the main starting material for arsenic chemistry This reaction is a prelude to the Marsh test, described below. The Marsh test is a highly sensitive method in the detection of Arsenic, especially useful in the field of Forensic toxicology when arsenic was used as a Poison

Alternatively, sources of As3− react with protonic reagents to also produce this gas:

Zn3As2 + 6 H+ → 2 AsH3 + 3 Zn2+

Reactions

The chemical properties of AsH3 are well developed and can be anticipated based on an average of the behavior of PH3 and SbH3. Phosphine is the common name for phosphorus hydride (PH3 also known by the IUPAC name phosphane and occasionally phosphamine. Stibine is the Chemical compound with the formula SbH3 This colourless gas is the principal Covalent hydride of Antimony and a heavy analogue

Thermal decomposition

Typical for a heavy hydride (e. g. , SbH3, H2Te, SnH4), AsH3 is unstable with respect to its elements. Stibine is the Chemical compound with the formula SbH3 This colourless gas is the principal Covalent hydride of Antimony and a heavy analogue In other words, AsH3 is stable kinetically but not thermodynamically.

2 AsH3 → 3 H2 + 2 As

This decomposition reaction is the basis of the Marsh Test described below, which detects the metallic As.

Oxidation

Continuing the analogy to SbH3, AsH3 is readily oxidized by O2 or even air:

2 AsH3 + 3 O2 → As2O3 + 3 H2O

Arsine will react violently in presence of strong oxidizing agents, such as potassium permanganate, sodium hypochlorite or nitric acid. Redox (shorthand for reduction-oxidation reaction describes all Chemical reactions in which atoms have their Oxidation number ( Oxidation state Potassium permanganate is the Chemical compound K[[manganese Mn]] O 4 Sodium hypochlorite is a Chemical compound with the formula NaClO Nitric acid ( H[[nitrate NO3]] also known as Aqua fortis and spirit of nitre, is a highly corrosive and [1]

Precursor to metallic derivatives

AsH3 is used as a precursor to metal complexes of "naked" (or "nearly naked") As. Illustrative is the dimanganese species [(C5H5)Mn(CO)2]2AsH, wherein the Mn2AsH core is planar. [4]

Gutzeit test

A characteristic test for arsenic involves the reaction of AsH3 with Ag+, called the Gutzeit test for arsenic. [5] Although this test has become obsolete in analytical chemistry, the underlying reactions further illustrate the affinity of AsH3 for "soft" metal cations. Analytical chemistry is the study of the Chemical composition of natural and artificial Materials. In the Gutzeit test, AsH3 is generated by reduction of aqueous arsenic compounds, typically arsenites, with Zn in the presence of H2SO4. Arsenous acid, also known as arsenious acid, is the Hydrolyzed form of Arsenic trioxide and has the formula As(OH3 The evolved gaseous AsH3 is then exposed to AgNO3 either as powder or as a solution. With "solid" AgNO3, AsH3 reacts to produce yellow Ag4AsNO3, whereas AsH3 reacts with a "solution" of AgNO3 to give black Ag3As.

Acid-base reactions

The acidic properties of the As–H bond are often exploited. Thus, AsH3 can be deprotonated:

AsH3 + NaNH2 → NaAsH2 + NH3

Upon reaction with the aluminium trialkyls, AsH3 gives the trimeric [R2AlAsH2]3, where R = (CH3)3C. [6] This reaction is relevant to the mechanism by which GaAs forms from AsH3 (see below).

AsH3 is generally considered non-basic, but it can be protonated by "super acids" to give isolable salts of the tetrahedral species [AsH4]+. [7]

Reaction with halogen compounds

Reactions of arsine with the halogens (fluorine and chlorine) or some of their compounds, such as nitrogen trichloride, are extremely dangerous and can result in explosions. Abundance Owing to their high Reactivity, the halogens are found in the environment only in compounds or as Ions Halide ions and oxoanions Fluorine, fluorum meaning "to flow" is the Chemical element with the symbol F and Atomic number 9 Chlorine (ˈklɔriːn from the Greek word 'χλωρóς' ( khlôros, meaning 'pale green' is the Chemical element with Atomic number 17 and Nitrogen trichloride, also known as trichloramine, trichlorine nitride is the Chemical compound with the formula NCl3 [1]

Catenation

In contrast to the behavior of PH3, AsH3 does not form stable chains, although H2As–AsH2 and even H2As–As(H)–AsH2 have been detected. The diarsine is unstable above −100 °C.

Applications

Microelectronics applications

AsH3 is used in the synthesis of semiconducting materials related to microelectronics and solid-state lasers. Related to P, Arsenic is an n-dopant for silicon and germanium. Phosphorus, (ˈfɒsfərəs is the Chemical element that has the symbol P and Atomic number 15 In Semiconductor production doping is the process of intentionally introducing impurities into an extremely pure (also referred to as intrinsic) semiconductor to [1] More importantly, AsH3 is used to make the semiconductor GaAs by CVD at 700–900 °C:

Ga(CH3)3 + AsH3 → GaAs + 3 CH4

For microelectronic applications, arsine can be provided via a so-called sub-atmospheric gas source. A semiconductor' is a Solid material that has Electrical conductivity in between a conductor and an insulator; it can vary over that Gallium arsenide ( GaAs) is a compound of two elements Gallium and Arsenic. Chemical vapor deposition (CVD is a Chemical process used to produce high-purity high-performance solid materials In this type of gas package, the arsine is adsorbed on a solid microporous adsorbent inside a gas cylinder. This method allows the gas to be stored without pressure which significantly reduces the risk of an arsine gas leak from the cylinder. With this apparatus, arsine is obtained by applying vacuum to the gas cylinder valve outlet. For semiconductor manufacturing, this method is practical as these processes usually operate under high vacuum.

Chemical warfare

Since before WWII AsH3 was proposed as a possible chemical warfare weapon. World War II, or the Second World War, (often abbreviated WWII) was a global military conflict which involved a majority of the world's nations, including Chemical warfare involves using the toxic properties of Chemical substances to kill injure or incapacitate an enemy. The gas is colorless, almost odourless, and 2. 5 times more dense than air, as required for a blanketing effect sought in chemical warfare. It is also lethal in concentrations far lower than those required to smell its garlic-like scent. Allium sativum L, commonly known as garlic, is a species in the Onion family Alliaceae. In spite of these characteristics, arsine was never officially used as a weapon, because of its high flammability and its lower efficacy when compared to the non-flammable alternative phosgene. Phosgene is the Chemical compound with the formula COCl2 This colorless gas gained infamy as a Chemical weapon during World War I On the other hand, several organic compounds based on arsine, such as lewisite (β-chlorovinyldichloroarsine), adamsite (diphenylaminearsine), Clark I (diphenylchlorarsine) and Clark II, (diphenylcyanoarsine) have been effectively developed for use in chemical warfare. An organic compound is any member of a large class of Chemical compounds whose Molecules contain Carbon. Lewisite is a Chemical compound from a chemical family called Arsines While it is colorless and odorless when pure Lewisite is usually found as an oily yellow or Adamsite or DM is an Organic compound; technically an Arsenical diphenylaminechlorarsine, that can be used as a Riot control agent [8]

Forensic science and the Marsh test

AsH3 is also well known in forensic science because it is a chemical intermediate in the detection of arsenic poisoning. The old (but extremely sensitive) Marsh test generates AsH3 in the presence of arsenic. The Marsh test is a highly sensitive method in the detection of Arsenic, especially useful in the field of Forensic toxicology when arsenic was used as a Poison [3] This procedure, developed around 1836 by James Marsh, is based upon treating a As-containing sample of a victim's body (typically the stomach) with As-free zinc and dilute sulfuric acid: if the sample contains arsenic, gaseous arsine will form. Year 1836 ( MDCCCXXXVI) was a Leap year starting on Friday (link will display the full calendar of the Gregorian Calendar (or a Leap James Marsh ( September 2, 1794 &ndash June 21, 1846) was a British Chemist who invented the Marsh test for detecting Zinc (ˈzɪŋk from Zink is a Metallic Chemical element with the symbol Zn and Atomic number 30 Sulfuric (or sulphuric acid, H 2 S[[oxygen O]]4 is a strong Mineral acid. The gas is swept into a glass tube and decomposed by means of heating around 250–300 °C. The presence of As is indicated by formation of a deposit in the heated part of the equipment. The formation of a black mirror deposit in the cool part of the equipment indicates the presence of Sb.

The Marsh test was widely used by the end of the 19th century and the start of the 20th; nowadays more sophisticated techniques such as atomic spectroscopy, inductively coupled plasma and x-ray fluorescence analysis are employed in the forensic field. Atomic spectroscopy is the determination of elemental composition by its electromagnetic or mass spectrum An inductively coupled plasma ( ICP) is a type of plasma source in which the Energy is supplied by Electrical currents which are produced by X-ray fluorescence (XRF is the emission of characteristic "secondary" (or fluorescent X-rays from a material that has been excited by bombarding with high-energy Though neutron activation analysis was used to detect trace levels of arsenic in the mid 20th century it has fallen out of use in modern forensics. Neutron activation is the process in which Neutron radiation induces Radioactivity in materials and occurs when atomic nuclei capture Free neutrons

Toxicology

For the toxicology of other arsenic compounds, see Arsenic, Arsenic trioxide, and Arsenicosis. Arsenic (ˈɑrsənɪk is a Chemical element that has the symbol As and Atomic number of 33 Arsenic trioxide is the most important commercial compound of Arsenic, and the main starting material for arsenic chemistry Arsenic Poisoning kills by Allosteric inhibition of essential metabolic Enzymes, leading to death from multi-system [7] The toxicity of arsine is distinct from that of other arsenic compounds. The main route of exposure is by inhalation, although poisoning after skin contact has also been described. Arsine attacks haemoglobin in the red blood cells, causing them to be destroyed by the body. Hemoglobin ( also spelled haemoglobin and abbreviated Hb or Hgb) is the Iron -containing Oxygen -transport Metalloprotein Red blood cells are the most common type of Blood cell and the Vertebrate body's principal means of delivering Oxygen to the body tissues via the Blood

The first signs of exposure, which can take several hours to become apparent, are headaches, vertigo and nausea, followed by the symptoms of haemolytic anaemia (high levels of unconjugated bilirubin), haemoglobinuria and nephropathy. A headache ( cephalalgia in medical terminology is a condition of pain in the Head; sometimes Neck or upper back pain may also be interpreted Vertigo (from the Latin vertere, to turn and the suffix -igo, a condition i Nausea ( Latin: Nausea, Greek:, " Sea-sickness " also called wamble) is the sensation of unease and discomfort Hemolytic anemia is Anemia due to Hemolysis, the abnormal breakdown of Red blood cells (RBCs either in the Blood vessels (intravascular hemolysis Bilirubin (formerly referred to as hematoidin) is the yellow breakdown product of normal Heme Catabolism. In Medicine, hemoglobinuria is a condition in which the Oxygen transport Protein Hemoglobin is found in abnormally high concentrations in the Nephropathy refers to damage to or disease of the Kidney. An older term for this is nephrosis. In severe cases, the damage to the kidneys can be long-lasting. The kidneys are complicated organs that have numerous biological roles

Exposure to arsine concentrations of 250 ppm is rapidly fatal: concentrations of 25–30 ppm are fatal for 30 min exposure, and concentrations of 10 ppm can be fatal at longer exposure times. Symptoms of poisoning appear after exposure to concentrations of 0. 5 ppm. There is little information on the chronic toxicity of arsine, although it is reasonable to assume that, in common with other arsenic compounds, a long-term exposure could lead to arsenicosis. Arsenic Poisoning kills by Allosteric inhibition of essential metabolic Enzymes, leading to death from multi-system

See also

Bibliography

  1. ^ a b c d e Institut National de Recherche et de Sécurité (2000). Arsenic (ˈɑrsənɪk is a Chemical element that has the symbol As and Atomic number of 33 Cacodylic acid is the Chemical compound with the formula (CH32AsO2H Cacodyl oxide is a Chemical compound of the formula 2O This Organoarsenic compound is primarily of historical significance as it is sometimes "Fiche toxicologique nº 53: Trihydrure d'arsenic" (PDF). Retrieved on 2006-09-06. Year 2006 ( MMVI) was a Common year starting on Sunday of the Gregorian calendar. Events 3114 BC - According to the Proleptic Julian calendar the current era in the Maya Long Count Calendar started
  2. ^ Bellama, J. M. ; MacDiarmid, A. G. "Synthesis of the Hydrides of Germanium, Phosphorus, Arsenic, and Antimony by the Solid-Phase Reaction of the Corresponding Oxide with Lithium Aluminum Hydride" Inorganic Chemistry, 1968, vol. 7, page 2070–2
  3. ^ a b Holleman, A. F. ; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001
  4. ^ Herrmann, W. A. ; Koumbouris, B. ; Schaefer, A. ; Zahn, T. ; Ziegler, M. L. "Generation and Complex Stabilization of Arsinidene and Diarsine Fragments by Metal-Induced Degradation of Monoarsine" Chemische Berichte (1985), vol. 118, pages 2472–88
  5. ^ King, E. J. "Qualitative Analysis and Electrolytic Solutions" Harcourt, Brace, and World; New York (1959)
  6. ^ Atwood, D. A. ; Cowley, A. H. ; Harris, P. R. ; Jones, R. A. ; Koschmieder, S. U. ; Nunn, C. M. ; Atwood, J. L. ; Bott, S. G. "Cyclic Trimeric Hydroxy, Amido, Phosphido, and Arsenido Derivatives of aluminum and gallium. X-ray Structures of [tert-Bu2Ga(m-OH)]3 and [tert-Bu2Ga(m-NH2)]3" Organometallics (1993), vol. 12, pages 24–29
  7. ^ a b R. Minkwitz, R. ; Kornath, A. ; Sawodny, W. ; Härtner, H. "Über die Darstellung der Pnikogenoniumsalze AsH4+SbF6−, AsH4+AsF6−, SbH4+SbF6−" Zeitschrift für anorganische und allgemeine Chemie Vol. 620, pages 753–756.
  8. ^ Suchard, Jeffrey R. (March 2006). "CBRNE — Arsenicals, Arsine" (HTML). HTML, an initialism of HyperText Markup Language, is the predominant Markup language for Web pages It provides a means to describe the structure eMedicine.  

Further reading

External links

Dictionary

arsine

-noun

  1. (chemical compound, uncountable) A compound of arsenic and hydrogen, AsH3, a colorless and exceedingly poisonous gas, having an odor like garlic.
  2. (organic chemistry, countable) Any organic derivative of this compound, or of diarsane, triarsane etc.
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