Chromium(III) acetate

Chromium(III) acetate
Names


IUPAC name Chromium(III) acetate hydrate
Other names chromic acetate, chromium triacetate, chromium(III) ethanoate
Identifiers
CAS Number	32591-52-9^Y
3D model (JSmol)	Interactive image
ChemSpider	13394^Y
ECHA InfoCard	100.012.646
PubChem CID	14012
CompTox Dashboard (EPA)	DTXSID4020327
InChI InChI=1/2C2H4O2.Cr/c21-2(3)4;/h21H3,(H,3,4);/q;;+2/p-2 Key: LRCIYVMVWAMTKX-NUQVWONBAT
SMILES 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
Chemical formula	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)
Magnetic susceptibility (χ)	-5104.0·10⁻⁶ cm³/mol
Structure
Coordination geometry	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). Y verify (what is ^YN ?) Infobox references

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.

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]

References

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