| Revision as of 10:23, 7 November 2011 editBeetstra (talk | contribs)Edit filter managers, Administrators172,074 edits Script assisted update of identifiers for the Chem/Drugbox validation project (updated: 'StdInChI', 'StdInChIKey').← Previous edit |
Latest revision as of 05:26, 24 November 2024 edit undoGraeme Bartlett (talk | contribs)Administrators250,223 edits chemspider |
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{{Chembox |
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{{Chembox |
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| Section1 = {{Chembox Identifiers |
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| SMILES = |
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| Name = |
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| StdInChI = <!-- blanked - oldvalue: 1S/Au.Cs --> |
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| ImageFile = CsCl polyhedra.png |
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| StdInChI_Ref = {{stdinchicite|correct|chemspider}} |
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| ImageFile1 = Caesium-auride-3D-vdW.png |
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| StdInChIKey = <!-- blanked - oldvalue: COOMJVRPVOQALF-UHFFFAOYSA-N --> |
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| ImageFile2 = Caesium auride.png |
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| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}} |
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| ImageCaption2 = Solution of CsAu(left), pure CsAu(right) |
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| verifiedrevid = 459436295 |
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| OtherNames = |
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| IUPACName = Caesium auride |
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| Section1 = {{Chembox Identifiers |
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| CASNo_Ref = {{cascite|correct|CAS}} |
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| CASNo = 12256-37-0 |
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| ChemSpiderID = 65322210 |
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| PubChem = 71308168 |
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| SMILES = |
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| SMILES_Comment = covalent form |
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| SMILES1 = . |
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| SMILES1_Comment = ionic form |
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| StdInChI = 1S/Au.Cs |
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| StdInChI_Ref = {{stdinchicite|changed|chemspider}} |
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| StdInChIKey = COOMJVRPVOQALF-UHFFFAOYSA-N |
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| StdInChIKey_Ref = {{stdinchicite|changed|chemspider}} |
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| Section2 = {{Chembox Properties |
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| Section2 = {{Chembox Properties |
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| Cs = 1 |
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| Cs=1|Au=1 |
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| Appearance = Yellow crystals |
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| Au = 1 |
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| MeltingPtC = 580 |
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| ExactMass = 329.871998479 g mol<sup>-1</sup> |
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| MeltingPt_ref = <ref name=ZAAC1>{{cite journal|last1=Kienast|first1=Gerhard|last2=Verma|first2=Jitendra|last3=Klemm|first3=Wilhelm|title=Das Verhalten der Alkalimetalle zu Kupfer, Silber und Gold|journal=Zeitschrift für anorganische und allgemeine Chemie|date=June 1961|volume=310|issue=3|pages=143–169|doi=10.1002/zaac.19613100304|language=German}}</ref> |
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| Appearance = Yellow crystals |
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| Solubility = reacts violently |
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| Section3 = {{Chembox Structure |
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| CrystalStruct = ] |
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| SpaceGroup = |
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| LattConst_a = 4.24 Å<ref name=ZAAC1/> |
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'''Caesium auride''' is the ] with the formula CsAu. It is the Cs<sup>+</sup> salt of the unusual Au<sup>−</sup> anion.<ref>{{cite journal |first1= William J. |last1= Peer |first2= J. J. |last2= Lagowski |author-link2= J J Lagowski |year= 1978 |journal= J. Am. Chem. Soc. |volume= 100 |pages= 6260–6261 |title= Metal-Ammonia Solutions. 11. Au<sup>−</sup>, a Solvated Transition Metal Anion |doi= 10.1021/ja00487a064 }}</ref> |
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'''Caesium auride''' (CsAu) is an ionic compound containing the unusual Au<sup>−</sup> ion. It is obtained by heating a stoichiometric mixture of ] and ]; the two metallic-yellow liquids react to give a clear product. The solution in liquid ammonia is brown, and the solid is yellow; the ammonium adduct is dark blue. |
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The compound reacts violently with water, yielding ] and metallic gold; in liquid ammonia it can be reacted with a cesium-specific ion exchange resin to produce tetramethylammonium auride.<ref>{{cite journal|title=Effects of relativistic motion of electrons on the chemistry of gold and platinum|journal=Solid State Sciences|date=2005-11-30|volume=7|issue=12|pages=1464–1474|doi=10.1016/j.solidstatesciences.2005.06.015|last=Jansen|first=Martin}}</ref> |
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==Preparation and reactions== |
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CsAu is obtained by heating a ] mixture of ] and ]. The two metallic-yellow liquids react to give a transparent yellow product.<ref name=jansen/> Despite being a compound of two metals, CsAu lacks metallic properties since it is a salt with localized charges; it instead behaves as a semiconductor with ] 2.6 eV.<ref>{{cite journal |last1=Norrby |first1=Lars J. |title=Why is mercury liquid? Or, why do relativistic effects not get into chemistry textbooks? |journal=Journal of Chemical Education |date=February 1991 |volume=68 |issue=2 |pages=110 |doi=10.1021/ED068P110|bibcode=1991JChEd..68..110N }}</ref> |
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The compound hydrolyzes readily, yielding ], metallic gold, and hydrogen.<ref name=jansen/> |
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==References== |
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:2 CsAu + 2 H<sub>2</sub>O → 2 CsOH + 2 Au + H<sub>2</sub> |
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The solution in liquid ] is brown, and the ammonia ] {{chem2|CsAu*NH3}} is blue; the latter has ammonia molecules ] between layers of the CsAu crystal parallel to the (110) plane. Solutions undergo metathesis with ] loaded ion exchange resin to give ].<ref name=jansen>{{cite journal|title=Effects of relativistic motion of electrons on the chemistry of gold and platinum|journal=Solid State Sciences|date=2005-11-30|volume=7|issue=12|pages=1464–1474|doi=10.1016/j.solidstatesciences.2005.06.015|last=Jansen|first=Martin|bibcode=2005SSSci...7.1464J|doi-access=free}}</ref> |
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==References== |
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{{Reflist}} |
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{{Reflist}} |
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==Further reading== |
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] |
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* {{cite journal |journal= Chemical Society Reviews |volume= 37 |issue= 9 |year= 2008 |title= The chemistry of gold as an anion |first= Martin |last= Jansen | pages= 1826–1835 |doi= 10.1039/B708844M |pmid= 18762832 }}—includes photograph of the compound. |
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] |
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{{Gold compounds}} |
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{{Inorganic-compound-stub}} |
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{{Caesium compounds}} |
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