| Revision as of 12:51, 6 December 2011 editBeetstra (talk | contribs)Edit filter managers, Administrators172,031 edits Saving copy of the {{chembox}} taken from revid 460873806 of page Rhodium(II)_acetate for the Chem/Drugbox validation project (updated: ''). |
Latest revision as of 18:56, 5 July 2024 edit Smokefoot (talk | contribs)Autopatrolled, Extended confirmed users, Pending changes reviewers, Rollbackers74,204 edits →Chemical properties: replace obsolete section (eclipsed) |
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{{ambox | text = This page contains a copy of the infobox ({{tl|chembox}}) taken from revid of page ] with values updated to verified values.}} |
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{{chembox |
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{{chembox |
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| Verifiedfields = changed |
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| verifiedrevid = 439902937 |
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| Watchedfields = changed |
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| Name = Rhodium (II) Acetate |
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| verifiedrevid = 464381848 |
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| ImageFile = Rhodium(II) acetate.jpg |
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| Name = Rhodium(II) acetate |
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<!-- | ImageSize = 200px --> |
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| ImageName = Rhodium(II) acetate |
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| ImageFile1 = Rhodium(II)-acetate-hydrate-dimer-from-xtal-1971-3D-balls.png |
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| IUPACName = Rhodium (II) acetate |
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| ImageFile2 = Rhodium(II) acetate.jpg |
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| ImageName = Rhodium(II) acetate |
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| OtherNames = Dirhodium tetraacetate,<br />Tetrakis(acetato)dirhodium(II),<br />Rhodium diacetate dimer,<br />Tetrakis-(mu-acetato)dirhodium |
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| IUPACName = Rhodium(II) acetate |
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| Section1 = {{Chembox Identifiers |
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| OtherNames = Dirhodium tetraacetate,<br />Tetrakis(acetato)dirhodium(II),<br />Rhodium diacetate dimer,<br />Tetrakis(''μ''-acetato)dirhodium |
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| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} |
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|Section1={{Chembox Identifiers |
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| SMILES = 1234#()(O(C)O1)(O(C)O2)(O(C)O3)O(C)O4 |
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| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} |
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| ChemSpiderID = 20370 |
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| ChemSpiderID = 20370 |
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| PubChem = 21674 |
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| PubChem = 152122 |
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| InChI = 1/2C2H4O2.Rh/c2*1-2(3)4;/h2*1H3,(H,3,4);/q;;+2/p-2 |
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| InChI = 1S/4C2H4O2.2Rh/c4*1-2(3)4;;/h4*1H3,(H,3,4);;/q;;;;2*+2/p-4 |
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| InChIKey = ITDJKCJYYAQMRO-NUQVWONBAE |
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| InChIKey = : SYBXSZMNKDOUCA-UHFFFAOYSA-J |
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| SMILES = .C(=O)C.C(=O)C |
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| StdInChI_Ref = {{stdinchicite|correct|chemspider}} |
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| StdInChI_Ref = {{stdinchicite|correct|chemspider}} |
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| StdInChI = 1S/2C2H4O2.Rh/c2*1-2(3)4;/h2*1H3,(H,3,4);/q;;+2/p-2 |
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| StdInChI = 1S/2C2H4O2.Rh/c2*1-2(3)4;/h2*1H3,(H,3,4);/q;;+2/p-2 |
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| CASNo_Ref = {{cascite|correct|CAS}} |
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| CASNo_Ref = {{cascite|correct|CAS}} |
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| CASNo = 15956-28-2 |
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| CASNo = 15956-28-2 |
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| UNII_Ref = {{fdacite|correct|FDA}} |
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| RTECS = VI9361000 |
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| UNII = NK3058Z56X |
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}} |
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| RTECS = VI9361000 |
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| Section2 = {{Chembox Properties |
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| EINECS = 240-084-8 |
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| Formula = C<sub>8</sub>H<sub>12</sub>O<sub>8</sub>Rh<sub>2</sub> |
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| MolarMass = 441.99 g/mol |
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| Appearance = Emerald green powder |
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| Density = 1.126 g/cm<sup>3</sup> |
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| Solubility = soluble |
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| Solvent = other solvents |
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| SolubleOther = polar organic solvents |
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| MeltingPt = >100 °C |
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| BoilingPt = decomposes |
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}} |
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| Section3 = {{Chembox Structure |
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| Coordination = ] |
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| CrystalStruct = ] |
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| Dipole = 0 ] |
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}} |
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| Section7 = {{Chembox Hazards |
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| ExternalMSDS = |
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| NFPA-H = 3 |
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| NFPA-R = 0 |
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| NFPA-F = 0 |
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| FlashPt = low flammability |
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| RPhrases = 36/38 |
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| SPhrases = 15, 26, 28A, 37/39 |
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}} |
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| Section8 = {{Chembox Related |
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| OtherCpds = ]<br />]<br /> |
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}} |
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}} |
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}} |
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|Section2={{Chembox Properties |
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| Formula = C<sub>8</sub>H<sub>12</sub>O<sub>8</sub>Rh<sub>2</sub> |
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| MolarMass = 441.99 g/mol |
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| Appearance = Emerald green powder |
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| Density = 1.126 g/cm<sup>3</sup> |
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| Solubility = soluble |
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| Solvent = other solvents |
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| SolubleOther = polar organic solvents |
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| MeltingPt = >100 °C |
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| BoilingPt = decomposes |
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}} |
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|Section3={{Chembox Structure |
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| Coordination = ] |
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| CrystalStruct = ] |
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| Dipole = 0 ] |
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}} |
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|Section7={{Chembox Hazards |
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| ExternalSDS = |
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| NFPA-H = 3 |
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| NFPA-R = 0 |
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| NFPA-F = 0 |
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| FlashPt = low flammability |
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| GHS_ref=<ref>{{cite web |title=Dirhodium tetraacetate |url=https://pubchem.ncbi.nlm.nih.gov/compound/152122#section=Safety-and-Hazards |website=pubchem.ncbi.nlm.nih.gov |access-date=14 December 2021 |language=en}}</ref> |
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| GHSPictograms = {{GHS07}} |
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| GHSSignalWord = Warning |
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| HPhrases = {{H-phrases|315|319}} |
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| PPhrases = {{P-phrases|264|280|302+352|305+351+338|321|332+313|337+313|362}} |
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}} |
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|Section8={{Chembox Related |
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| OtherCompounds = ]<br />] |
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}} |
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}} |
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'''Rhodium(II) acetate''' is the ] with the ] ]<sub>2</sub>(AcO)<sub>4</sub>, where AcO<sup>−</sup> is the ] ion ({{chem|CH|3|CO|2|−}}). This dark green powder is slightly soluble in polar solvents, including water. It is used as a catalyst for ] of ]s. It is a widely studied example of a ].<ref name=Felthouse/> |
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==Preparation== |
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Rhodium(II) acetate is usually prepared by the heating of ] ] in a methanol-] mixture. The crude product is the bis(methanol) complex, but it is easily desolvated.<ref name=Felthouse>{{cite book |doi=10.1002/9780470166307.ch2 |chapter=The Chemistry, Structure, and Metal-Metal Bonding in Compounds of Rhodium(II) |title=Progress in Inorganic Chemistry |date=1982 |last1=Felthouse |first1=Timothy R. |volume=29 |pages=73–166 |isbn=978-0-471-09370-1 }}</ref><ref>{{Cite book | last1 = Rempel | first1 = G. A. | last2 = Legzdins | first2 = P. | last3 = Smith | first3 = H. | last4 = Wilkinson | first4 = G. | title = Inorganic Syntheses | chapter = Tetrakis(acetato)dirhodium(II) and Similar Carboxylato Compounds | doi = 10.1002/9780470132449.ch16 | journal = ] | volume = 13 | pages = 90–91 | year = 1972 | isbn = 9780470132449 }}</ref> |
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==Structure and properties== |
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The structure of rhodium(II) acetate features a pair of ] atoms, each with ], defined by four acetate oxygen atoms, water, and a Rh–Rh bond of length 2.39 ]. The water ] is exchangeable, and a variety of other ]s bind to the axial positions.<ref>{{Cite journal | last1 = Cotton | first1 = F. A. | last2 = Deboer | first2 = B. G. | last3 = Laprade | first3 = M. D. | last4 = Pipal | first4 = J. R. | last5 = Ucko | first5 = D. A. | title = The crystal and molecular structures of dichromium tetraacetate dihydrate and dirhodium tetraacetate dihydrate | doi = 10.1107/S0567740871004527 | journal = Acta Crystallogr B | volume = 27 | issue = 8 | pages = 1664 | year = 1971 | doi-access = }}</ref> ] and ] adopt ]. |
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==Chemical properties== |
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The dimer binds a number of classical ]s to form 2:1 adducts: |
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Its ] is eclipsed by the enhanced reactivity of ], which even binds arenes and alkenes. |
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The acetate group can be replaced by other carboxylates of strong acids. The yields are nearly quantitative. |
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Like almost all rhodium complexes, rhodium(II) acetate catalyzes many reactions such as hydrogenation and hydrosilylation. No evidence exists for mechanisms and the behavior has not motivated further work. The important observation that rhodium(II) acetate catalyzes reactions of diazo compounds has led to considerable research, but mostly focused on the trifluoroacetate or chiral derivatives. |
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==References== |
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{{Reflist}} |
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{{Rhodium compounds}} |
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{{Acetates}} |
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{{DEFAULTSORT:Rhodium(II) Acetate}} |
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] |
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] |
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] |