Copper(II) stearate

Copper(II) stearate is a metal-organic compound, a salt of copper and stearic acid with the formula Cu(C17H35COO)2. 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:
 * $$\mathsf{ CuSO_4 + 2C_{17}H_{35}O_2Na \ \xrightarrow{}\ Cu(C_{17}H_{35}O_2)_2\downarrow + Na_2SO_4 }$$

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

Insoluble in water, ethanol, or ether; soluble in pyridine.

Chemical properties
The compound is stable and non-reactive under normal conditions.

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:
 * $$\mathsf{ (C_{17}H_{35}COO)_2 Cu + 52O_2 \ \xrightarrow{t}\ CuO\downarrow + 36CO_2\uparrow + 35H_2O\uparrow }$$

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

Also used as a component in casting bronze sculptures.

Also applies as a catalyst for the decomposition of hydroperoxides.