Chromium(III) acetate

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Chromium(III) acetate
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Chromium(III) acetate.jpg
Names
IUPAC name
Chromium(III) acetate hydrate
Other names
chromic acetate,
chromium triacetate,
chromium(III) ethanoate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.012.646 Edit this at Wikidata
  • InChI=1/2C2H4O2.Cr/c2*1-2(3)4;/h2*1H3,(H,3,4);/q;;+2/p-2
    Key: LRCIYVMVWAMTKX-NUQVWONBAT
  • o1c(C)[o+][Cr-3]6(O23)([OH2+])([o+]c(C)o4)[o+]c(C)o[Cr-3]24([OH2+])([o+]c(C)o5)[o+]c(C)o[Cr-3]135([OH2+])[o+]c(C)o6
Properties
C12H36ClCr3O22
Molar mass 723.84 g·mol−1
Appearance grayish-green to blueish-green solid
Density 1.662 g/cm3
Melting point 1,152[1] °C (2,106 °F; 1,425 K)
-5104.0·10−6 cm3/mol
Structure
octahedral
Related compounds
Related compounds
Manganese(III) acetate
Iron(III) acetate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Chromium(III) acetate, commonly known as basic chromium acetate,[2] describes a family of salts where the cation has the formula [Cr3O(O2CCH3)6(OH2)3]+. The trichromium cation is encountered with a variety of anions, such as chloride and nitrate. Data in the table above are for the chloride hexahydrate, [Cr3O(O2CCH3)6(OH2)3]Cl(H2O)6.

Salts of basic chromium acetate has long attracted interest because of its distinctive structure, which features octahedral Cr(III) centers, a triply bridging oxo ligand, six acetate ligands, and three aquo ligands.[2] The same structure is shared with basic iron acetate and basic manganese acetate.[2][3] Little evidence exists for a simple chromium(III) acetate, i.e. lacking the oxo ligand.[4] Chromium(III) acetate is a blue/grey-green powder, which is soluble in water. It is still[3] prepared according to the original procedure from 1909.[5]

The cation in basic iron acetate is isostructural with the cation in basic chromium acetate. Both feature octahedral metal centers conjoined by oxo and acetate bridging ligands.

See also[edit]

References[edit]

  1. ^ "Chromium (III) compounds". National Pollutant Inventory. Australian Government Department of Agriculture, Water and the Environment. Retrieved 14 April 2021.
  2. ^ a b c Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
  3. ^ a b Kurt J. Schenk, Hans U. Güdel (1982). "Low-temperature structural and spectroscopic properties of [Cr3O(CH3COO)6(H2O)3]Cl.6H2O". Inorg. Chem. 21 (6): 2253–2256. doi:10.1021/ic00136a025.{{cite journal}}: CS1 maint: uses authors parameter (link)
  4. ^ Erre, Liliana Strinna; Micera, Giovanni; Glowiak, Tadeusz; Kozlowski, Henry (April 1997). "Chromium (III) Acetate, Chromium (III) Acetate Hydroxide, or µ3-Oxo-esakis-(µ2-acetato-O,O') - triaqua-trichromium (III) Acetate? Determining the Structure of a Complex Compound by Analytical and Spectroscopic Methods". Journal of Chemical Education. 74 (4): 432. Bibcode:1997JChEd..74..432E. doi:10.1021/ed074p432.
  5. ^ R. Weinland P. Dinkelacker (1909). "Über Salze einer Hexaacetato(formiato)‐trichrombase. II". Berichte der Deutschen Chemischen Gesellschaft. 42 (3): 2997–3018. doi:10.1002/cber.19090420318.{{cite journal}}: CS1 maint: uses authors parameter (link)