Palladium disulfide explained

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

Preparation

Palladium disulfide is formed when palladium(II) sulfide is heated with an excess of sulfur.

PdS + S → PdS₂

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 °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 S^2- and Pd⁴⁺ ions.^[1] 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, Pd_2.8S, Pd_2.2S and PdS.

See also

• Pyrite
• Marcasite
• Platinum disulfide
• Platinum diselenide

Notes and References

1. Crystal Structures of the High‐Pressure Palladium Dichalcogenides Pd_0.94(1)S₂ and Pd_0.88(1)Se₂ Comprising Exceptional Pd^IV Oxidation States . Elisabeth . Selb . Thomas . Götsch . Oliver . Janka . Simon . Penner . Gunter . Heymann . . 2017 . 643 . 21 . 1415–1423 . 10.1002/zaac.201700140 . free .