12279-90-2

Basic information

• Product Name: Tetraarsenic tetrasulfide.
• Synonyms: Tetraarsenic tetrasulfide.;2,4,6,8-Tetrathia-1,3,5,7-tetraarsatricyclo[3.3.0.03,7]octane
• CAS NO: 12279-90-2
• Molecular Formula: As₄S₄
• Molecular Weight: 427.9464
• Mol File: 12279-90-2.mol
• Article Data: 5

Chemical Properties

• Melting Point: 320°
• Boiling Point: bp 565°
• Flash Point: °C
• Appearance: /red monoclinic crystals
• Density: 3.5
• Water Solubility: insoluble H2O, hot HCl; soluble warm alkali [KIR78]
• CAS DataBase Reference: Tetraarsenic tetrasulfide.(CAS DataBase Reference)
• NIST Chemistry Reference: Tetraarsenic tetrasulfide.(12279-90-2)
• EPA Substance Registry System: Tetraarsenic tetrasulfide.(12279-90-2)

Safety Data

• Hazardous Substances Data: 12279-90-2(Hazardous Substances Data)

Usage

Chemical Properties

red or orange solid; naturally occurring mineral; can be manufactured by heating iron pyrites and arsenopyrite; used in pyrotechnics [KIR78]

Occurrence

Arsenic sulfide occurs in nature as the mineral realgar. It is used as a pigment; in pyrotechnics to produce blue fire; in dyeing and calico printing; and as a depilatory for hides.

Uses

As pigment in painting; in fireworks as blue fire and to give an intense white flame; manufacture of shot; calico printing and dyeing; tanning and depilating hides.

Preparation

Arsenic sulfide is prepared commercially by heating a mixture of iron pyrites and arsenopyrite; or by heating arsenic trioxide with sulfur. The compound is then sublimed and collected. It may be also made from arsenic sesquisulfide - by either heating with sodium bicarbonate in a sealed tube or on prolong treatment with boiling solution of sodium carbonate.

InChI:InChI=1/As4S4/c5-1-2-7-3(5)4(6-1)8-2

Upstream product

• 7704-34-9 sulfur 
• 23550-45-0 disulfur 
• 27016-73-5 cobalt monoarsenide 
• 1303-18-0 iron sulfoarsenide 
• 1303-18-0 arsenopyrite 
• 7446-09-5 sulfur dioxide 
• 14040-11-0 tungsten hexacarbonyl 
• 99021-99-5 tetraphenylphosphonium pentachlorothioarsenate(III) 

Downstream Products

• 77846-58-3 As₃S₄⁽¹⁺⁾*AsF₆^(1-) = As₃S₄(AsF₆) 
• 7704-34-9 sulfur 
• 10025-91-9 antimony(III) chloride 
• 7784-34-1 arsenic trichloride 
• 10025-67-9 disulfur dichloride 
• 114630-36-3 P(C₆H₅)4⁽¹⁺⁾*As₃S₃Br₄^(1-)=P(C₆H₅)4(As₃S₃Br₄) 

Relevant articles and documents

Neue FeAsS-Kaefigstrukturen aus +Fe(CO)2>2 (Cp+ = C5Me4Et) und Realgar

The reaction of +Fe(CO)2>2 (Cp+ = η5-C5Me4Et) with equimolar amounts of As4S4 in boiling toluene gives Cp+2Fe2As2S2 (1) and Cp+2Fe2As2S3 (2).Both complexes form with two equivalents of Cr(CO)5THF the bisadducts Cp+2Fe2As2S2*2Cr(CO)5 (3) and Cp+2Fe2As2S3*2Cr(CO)5 (4), respectively.The Cr(CO)5 fragments are bound to the As atoms.X-ray diffraction analyses have been carried out for 1 and 4.The structure of 1 contains two coplanar η2-AsS bridges which bisect the Fe-Fe vector and are parallel to the Cp+ ligands.Complex 1 is formulated as a 30e tripledecker complex for it contains an As-As distance (2.629(1) Angstroem) very close to As-As bonding.The structure of 4 contains a Fe2As2S3 cage.The inorganic ligand is formally built up by two syn oriented AsS units which are bridged by a S atom.Such a view is supported by the conversion of 1 into 2 by reaction with a mild sulfur donator, e.g.As4S4.Key words: Chromium; Iron; Carbonyl; Arsenic, Sulfur; Cage compound

The reaction of as4Sn (n = 3, 4) and as2S3 with (C5Me4R)2Co2(CO)2 (R = Me, Et): Fragmentation and of by organometallic complexes

The reaction of Cp2#Co2(CO)2 1 (Cp# = Cp* or Cpx; Cp* = C5Me5: a; Cpx = C5Me4Et: b) with equimolar amounts of As4Sn (n = 3, 4) and As2S3 was investigated at different temperatures. The formation of Cp2#Co2(CO)As2S2 3, Cp2#Co2As2S3 4, Cp3#Co3As2S4 5, and Cp3#Co3As4S2 6 was observed in ratios depending on the reaction conditions. Starting from As4S4 or As4S3 and 1b insertion of a CpxCo(CO) fragment into one of the As-As bonds of the cages was achieved in low yields leading to CpxCo(CO)As4S4 2b and CpxCo(CO)As4S3 8, respectively. Structures were studied by means of IR and 1H-NMR spectroscopy and X-ray diffraction analyses. Cp2#Co2{CO}As2S2 3 may be supposed to be the key intermediate in the whole reaction sequence: On heating solutions of 3 complexes 4-6 of higher nuclearity and different connectivity within the inorganic ligand were formed. VCH Verlagsgesellschaft mbH, 1996.

Regularities of the Interaction of Copper, Cobalt, and Iron Arsenides with Sulfur under Nonequilibrium Conditions

The regularities in the sulfiding of arsenides of copper, cobalt, and iron by elemental sulfur under nonequilibrium conditions are studied by the physicochemical methods of analysis. The temperature intervals of the interaction, the phases of the intermediate stages, and the role of heterogeneous reactions in the sulfide-formation mechanism are determined.