Palladium disulfide


Palladium disulfide is a chemical compound of palladium and sulfur with the chemical formula PdS2.

Preparation

Palladium disulfide is formed when palladium sulfide is heated with an excess of sulfur.
However, some starting material may remain even after heating for many months. An alternative route involves heating palladium chloride and excess sulfur to 450 °C in a sealed tube, then washing the crude product with carbon disulfide. This procedure yields PdS2 free of PdS.

Structure

PdS2 contains sulfur-sulfur bonds so it can be thought of as a disulfide that formally consists of S22− and Pd2+ ions, instead of S2- and Pd4+ ions. It adopts a layered crystal structure that contains square planar palladium centres and trigonal pyramidal sulfur centres.

Related compounds

A variety of other compounds in the Pd-S system have been reported, including Pd4S, Pd2.8S, Pd2.2S and PdS.