Aluminium sulfide 5022827 216229736 2008-05-31T18:23:05Z Thijs!bot 1392310 robot Adding: [[ca:Sulfur d'alumini]] {{Chembox new | Name = Aluminium sulfide | OtherNames = | Section1 = {{Chembox Identifiers | CASNo = 1302-81-4 }} | Section2 = {{Chembox Properties | Formula = Al<sub>2</sub>S<sub>3</sub> | MolarMass = 150.158076 g/mol | Appearance = colorless | Density = 2.0 g/cm<sup>3</sup>, solid | Solubility = decomposes | Solvent = other solvents | SolubleOther = none | MeltingPt = 1100°C | BoilingPt = 1500°C (sublimes) }} | Section7 = {{Chembox Hazards | EUClass = not listed | NFPA-H = 4 | NFPA-R = 2 | NFPA-F = 0 }} }} '''Aluminium sulfide''' is the name for the [[chemical compound]] with the formula [[Aluminium|Al<sub>2</sub>]][[Sulfur|S<sub>3</sub>]]. This colorless species has an interesting structural chemistry, existing in three different forms. The material is sensitive to moisture, hydrolyzing readily to hydrated aluminium oxides/hydroxides.<ref>Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.</ref> The hydrolysis reaction also generates the odoriferous and toxic gas hydrogen sulfide (H<sub>2</sub>S). Unlike Al<sub>2</sub>O<sub>3</sub>, in which the Al(III) centers occupy octahedral holes, the more expanded framework of Al<sub>2</sub>S<sub>3</sub> stabilizes the Al(III) centers into one third of the tetrahedral holes of a hexagonally close-packed arrangement of the sulfide anions. At higher temperature, the Al(III) centers become randomized to give a "defect [[wurtzite]]" structure. And at still higher temperatures stabilize the γ-Al<sub>2</sub>S<sub>3</sub> forms, with a structure akin to γ-Al<sub>2</sub>O<sub>3</sub>. Molecular derivatives of Al<sub>2</sub>S<sub>3</sub> are not known. Mixed Al-S-Cl compounds are however known. Also Al<sub>2</sub>Se<sub>3</sub> and Al<sub>2</sub>Te<sub>3</sub> are also known. ==Preparation== Aluminium sulfide is readily prepared by ignition of the elements: :2Al + 3S → Al<sub>2</sub>S<sub>3</sub> This reaction is extremely exothermic and it is not necessary or desirable to heat the whole mass of the sulfur-aluminium mixture; (except possibly for very small preps). The product will be created in a fused form; that is at greater than 1100°C and may melt its way through steel. The cooled product is very hard. ==References== <references/> MSDS: http://www.espi-metals.com/msds's/Aluminum%20Sulfide.htm [[Category:Sulfides]] [[Category:Aluminium compounds]] {{inorganic-compound-stub}} [[ar:كبريتيد ألومنيوم]] [[ca:Sulfur d'alumini]]