Chromium(II) acetate

Chromium(II) acetate hydrate, also known as chromous acetate, is the coordination compound with the formula Cr2(CH3CO2)4(H2O)2. This formula is commonly abbreviated Cr2(OAc)4(H2O)2. This red-coloured compound features a quadruple bond. The preparation of chromous acetate once was a standard test of the synthetic skills of students due to its sensitivity to air and the dramatic colour changes that accompany its oxidation. It exists as the dihydrate and the anhydrous forms.

Chromium(II) acetate
Names
IUPAC name
Chromium(II) acetate hydrate
Other names
chromous acetate,
chromium diacetate,
chromium(II) ethanoate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.224.848
RTECS number
  • AG3000000
UNII
  • InChI=1S/2C2H4O2.Cr/c2*1-2(3)4;/h2*1H3,(H,3,4);/q;;+2/p-2 Y
    Key: LRCIYVMVWAMTKX-UHFFFAOYSA-L Y
  • InChI=1/2C2H4O2.Cr/c2*1-2(3)4;/h2*1H3,(H,3,4);/q;;+2/p-2
    Key: LRCIYVMVWAMTKX-NUQVWONBAT
  • [Cr+2]1234([OH2])#[Cr+2]([OH2])(O[C-](C)O1)(O[C-](C)O2)(O(C)[C-]O3)O(C)[C-]O4
Properties
C8H16Cr2O10
Molar mass 376.198 g·mol−1
Appearance brick-red solid
Density 1.79 g/cm3
Melting point dehydrates
soluble in hot water, MeOH
-5104.0·10−6 cm3/mol
Structure
monoclinic
octahedral
counting the Cr–Cr bond
0 D
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 could react exothermically in air
Related compounds
Related compounds
 Rh2(OAc)4(H2O)2
Cu2(OAc)4(H2O)2, molybdenum(II) 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

Cr2(OAc)4(H2O)2 is a reddish diamagnetic powder, although diamond-shaped tabular crystals can be grown. Consistent with the fact that it is nonionic, Cr2(OAc)4(H2O)2 exhibits poor solubility in water and methanol.

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