Copper(II) stearate

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Copper(II) stearate
Copper(II) stearate
Copper(II) stearate
Names
Other names
copper(2+) dioctadecanoate, cupric stearate, copper distearate[1]
Identifiers
3D model (JSmol)
ChemSpider
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EC Number
  • 211-540-3
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UNII
  • InChI=1S/2C18H36O2.Cu/c2*1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18(19)20;/h2*2-17H2,1H3,(H,19,20);/q;;+2/p-2
    Key: PEVZEFCZINKUCG-UHFFFAOYSA-L
  • [Cu+2].[O-]C(=O)CCCCCCCCCCCCCCCCC.[O-]C(=O)CCCCCCCCCCCCCCCCC
Properties
Cu(C17H35COO)2
Molar mass 630.48
Appearance blue-green amorphous substance
Density 1.10 g/cm3
Boiling point 250 °C (482 °F; 523 K)
insoluble
Hazards
GHS labelling:
GHS07: Exclamation mark
Warning
H315, H319, H335
P261, P280, P305, P338, P351
Related compounds
Related compounds
 Mercury(II) stearate, Cobalt(II) stearate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Copper(II) stearate is a metal-organic compound, a salt of copper and stearic acid with the formula Cu(C17H35COO)2.[2][3] The compound is classified as a metallic soap, i.e. a metal derivative of a fatty acid.

Synthesis

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Exchange reaction of sodium stearate and copper sulfate:[4][5]

CuSO4 + 2 C17H35O2Na → Cu(C17H35O2)2↓ + Na2SO4

Physical properties

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Copper(II) stearate forms a blue-green amorphous substance[6] similar to plasticine both in appearance and touch.

Insoluble in water, ethanol, or ether; soluble in pyridine.[7]

Chemical properties

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The compound is stable and non-reactive under normal conditions.[8]

When trying to ignite, copper stearate first melts and then begins to burn with a green (at the base) flame, then it quickly turns black due to the formation of cupric oxide:

(C17H35CO2)2 + 5 O2 → CuO↓ + 36 CO2↑ + 35 H2O↑

Uses

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The compound is used in the production of antifouling paint and varnish materials.

Also used as a component in casting bronze sculptures.[9]

Also applies as a catalyst for the decomposition of hydroperoxides.[10]

References

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