Palladium disulfide is a chemical compound of palladium and sulfur with the chemical formula PdS<sub>2</sub>.
PdS<sub>2</sub> contains sulfur-sulfur bonds so it can be thought of as a disulfide that formally consists of S<sub>2</sub><sup>2âÂÂ</sup> and Pd<sup>2+</sup> ions, instead of S<sup>2-</sup> and Pd<sup>4+</sup> ions. It adopts a layered crystal structure that contains square planar palladium centres and trigonal pyramidal sulfur centres.
Palladium disulfide is formed when palladium(II) 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(II) chloride and excess sulfur to 450 ðC in a sealed tube, then washing the crude product with carbon disulfide. This procedure yields PdS<sub>2</sub> free of PdS.
A variety of other compounds in the Pd-S system have been reported, including Pd<sub>4</sub>S, Pd<sub>2.8</sub>S, Pd<sub>2.2</sub>S and PdS.