Copper(II) stearate

Copper(II) stearate

Names
Other names copper(2+) dioctadecanoate, cupric stearate, copper distearate[1]
Identifiers
CAS Number	660-60-6^Y
3D model (JSmol)	Interactive image
ChemSpider	84453
ECHA InfoCard	100.010.493
EC Number	211-540-3
PubChem CID	93553
UNII	Z3VAO22R1R
CompTox Dashboard (EPA)	2060963
InChI 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
SMILES [Cu+2].[O-]C(=O)CCCCCCCCCCCCCCCCC.[O-]C(=O)CCCCCCCCCCCCCCCCC
Properties
Chemical formula	Cu(C17H35COO)2
Molar mass	630.48
Appearance	blue-green amorphous substance
Density	1.10 g/cm^3
Boiling point	250 °C (482 °F; 523 K)
Solubility in water	insoluble
Hazards
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335
Precautionary statements	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). Infobox references

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

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

${\displaystyle {\mathsf {CuSO_{4}+2C_{17}H_{35}O_{2}Na\ {\xrightarrow {}}\ Cu(C_{17}H_{35}O_{2})_{2}\downarrow +Na_{2}SO_{4}}}}$

Physical properties

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

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:

${\displaystyle {\mathsf {(C_{17}H_{35}COO)_{2}Cu+52O_{2}\ {\xrightarrow {t}}\ CuO\downarrow +36CO_{2}\uparrow +35H_{2}O\uparrow }}}$

Uses

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

1. "CAS 660-60-6 Copper(ii)stearate - Alfa Chemistry". alfa-chemistry.com. Retrieved 13 February 2023.
2. "Copper(II) stearate". Oakwood Chemical. Retrieved 13 February 2023.
3. "Copper(II) Stearate". American Elements. Retrieved 13 February 2023.
4. Richardson, H. Wayne (16 January 1997). Handbook of Copper Compounds and Applications. CRC Press. p. 85. ISBN 978-0-8247-8998-5. Retrieved 13 February 2023.
5. "Cupric stearate | 660-60-6". ChemicalBook. Retrieved 13 February 2023.
6. "MatWeb - The Online Materials Information Resource". matweb.com. Retrieved 13 February 2023.
7. Haynes, William M. (9 June 2015). CRC Handbook of Chemistry and Physics, 96th Edition. CRC Press. pp. 4–62. ISBN 978-1-4822-6097-7. Retrieved 13 February 2023.
8. "SAFETY DATA SHEET" (PDF). chemservice.com. Retrieved 14 February 2023.
9. Scott, David A. (2002). Copper and Bronze in Art: Corrosion, Colorants, Conservation. Getty Publications. p. 293. ISBN 978-0-89236-638-5. Retrieved 13 February 2023.
10. Ugo, R. (6 December 2012). Aspects of Homogeneous Catalysis: A Series of Advances. Springer Science & Business Media. p. 85. ISBN 978-94-010-1199-0. Retrieved 13 February 2023.