Neodymium acetate

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  Neodymium acetate   
Names: neodymium(III) acetate
neodymium triacetate

Formula: Nd(CH3COO)3 (anhydrous)
Nd(CH3COO)3 · H2O (monohydrate)
Nd(CH3COO)3 · 4H2O (tetrahydrate)
SMILES: CC(=O)[O-].CC(=O)[O-].CC(=O)[O-].[Nd+3]
Molar mass: 321.371 g/mol (anhydrous)
339.386 g/mol (monohydrate)
393.431 g/mol (tetrahydrate)
Crystal system: triclinic (tetrahydrate)
a=9.425 Å
9.4250 Å
0.9425 nm
, b=9.932 Å
9.9320 Å
0.9932 nm
, c=10.65 Å
10.6500 Å
1.0650 nm
α=88.09°
88°5′24.0″  
, β=115.06°
115°3′36.0″  
, γ=123.69°
123°41′24.0″  

Shapes:
https://media.crystalls.info/w/uploads/media/Truncated_oblique_rhombic_prism.json

Color: pale pink
pale violet
Optical properties: pleochroism
Magnetic properties: paramagnetic
Stability: slightly hygroscopic (anhydrous)
erodes (tetrahydrate)
Hardness: fragile
Toxicity: moderately toxic

Description

Organic compound, salt of trivalent rare earth metal neodymium and organic acetic acid. From water solutions crystallizes as tetrahydrate and monohydrate.

Precursors

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

Chemical equation:

6CH3COOH + Nd2O3 = 2Nd(CH3COO)3 + 3H2O
3CH3COOH + Nd(OH)3 = Nd(CH3COO)2 + 3H2O
6CH3COOH + Nd2(CO3)3 = 2Nd(CH3COO)3 + 3H2O + 3CO2

For preparation of 100.00g of neodymium acetate tetrahydrate а 59.54g of carbonate or 49.63g of hydroxide or 42.76g of neodymium oxide and 65.42g of 70% acetic acid is required.
Add acid to the flask, then add small parts of neodymium 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.

Reaction between neodymium magnet (usually from HDD) and acetic acid

Chemical equation:

20CH3COOH + Nd2Fe14B = 2Nd(CH3COO)3 + 7Fe(CH3COO)2 + 10H2↑ + B↓

For preparation of 100.00g of neodymium acetate tetrahydrate а 137.40g of mass of magnet and 218.05g of 70% acetic acid is required.
Add hot acid solution to the flask, then add neodymium magnet pieces, shavings or powder and stir it until gas emission will stop. For purifying compound from {{{impurity}}} add large amount of cold ethanol to solution, salt will settle to the bottom in the form of fine crystals or powder. Filter precipitate and wash it with small amount of the same solvent, then filter the solution and use it for crystal growing.

Magnet should be calcined to remove magnetical properties and released from a nickel shell.
Best results are obtained by evaporation solution to a solid state and its dissolution in ethanol
.

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.

Solubility

Temperatureгр/100,00 гр water
(anhydrous)(monohydrate)(tetrahydrate)
0°C
273.15 K
32 °F
491.67 °R
~21.1
21.1 g/100g
17.424 %
22.6
22.6 g/100g
18.434 %
~27.2
27.2 g/100g
21.384 %
10°C
283.15 K
50 °F
509.67 °R
~22.8
22.8 g/100g
18.567 %
~24.4
24.4 g/100g
19.614 %
~29.5
29.5 g/100g
22.78 %
15°C
288.15 K
59 °F
518.67 °R
~23.7
23.7 g/100g
19.159 %
~25.3
25.3 g/100g
20.192 %
~30.6
30.6 g/100g
23.43 %
20°C
293.15 K
68 °F
527.67 °R
~24.5
24.5 g/100g
19.679 %
26.2
26.2 g/100g
20.761 %
~31.7
31.7 g/100g
24.07 %

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