Samarium acetate

From Crystal growing

   Samarium acetate   
Names: samarium(III) acetate
samarium triacetate

Formula: Sm(CH3COO)3 (anhydrous)
Sm(CH3COO)3 · 3H2O (trihydrate)
SMILES: CC(=O)[O-].CC(=O)[O-].CC(=O)[O-].O.[Sm+3]
Molar mass: 327.491 g/mol (anhydrous)
381.536 g/mol (trihydrate)
Density: 1.94 g/cm3 (trihydrate)
Crystal system: tetragonal (trihydrate)
α=90°, β=90°, γ=90°

Color: light yellow
Stability: erodes (trihydrate)
Hardness: fragile
Toxicity: moderately toxic


Organic compound, salt of trivalent rare earth metal samarium and organic acetic acid. From water solutions crystallizes as trihydrate.


Reaction between samarium(III) oxide, hydroxide or carbonate and acetic acid

Chemical equation:

6CH3COOH + Sm2O3 = 2Sm(CH3COO)3 + 3H2O
3CH3COOH + Sm(OH)3 = Sm(CH3COO)2 + 3H2O
6CH3COOH + Sm2(CO3)3 = 2Sm(CH3COO)3 + 3H2O + 3CO2

For preparation of 100.00g of samarium acetate trihydrate а 63.00g of carbonate or 52.78g of hydroxide or 45.70g of samarium oxide and 67.45g of 70% acetic acid is required.

Add acid to the flask, then add small parts of samarium compound with stirring until it will totally dissolve or, if you use carbonate, until carbon dioxide emission will stop. After reaction will stop, filter the solution and use it for crystal growing.

Storage conditions

For crystal storing use hermetic vessel with small amount of saturated solution at the bottom or place wadding moistened with such solution. You can use such alternatives as vessel with vaseline or vegetable oil, organic non-hygroscopic solvent (kerosene, benzine or paraffin). Also you can use acrylate polymer or another kinds of solidifying plastic.


Temperatureгр/100,00 гр water
25°C298.15 K <br />77 °F <br />536.67 °R <br />~12.615