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 OOjs UI icon edit-ltr-progressive.svg
PubChem CID
  • 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
Appearancegrayish-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.

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. BasicFeacetate.png
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.

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]

See also

References

  1. ↑ "Chromium (III) compounds". National Pollutant Inventory. Australian Government Department of Agriculture, Water and the Environment. Retrieved 14 April 2021.
  2. 1 2 3 Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN   978-0-08-037941-8.
  3. 1 2 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.
  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.
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