Palladium disulfide

Palladium disulfide

Names
Other names Palladium(II) disulfide
Identifiers
CAS Number	12137-75-6  Y
3D model (JSmol)	Interactive image
PubChem CID	163192485
InChI InChI=1S/Pd.S2/c;1-2/q+2;-2 Key: ZMOVFMLVWHDWBO-UHFFFAOYSA-N
SMILES [S-][S-].[Pd+2]
Properties
Chemical formula	PdS2
Appearance	grey solid [1] or black crystalline powder [2] metallic crystals
Related compounds
Other anions	PdSe2, PdTe2
Other cations	PtS2, RuS2, IrS2
Related compounds	PdS
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Palladium disulfide is a chemical compound of palladium and sulfur with the chemical formula PdS₂. ^[1]

Preparation

Palladium disulfide is formed when palladium(II) sulfide is heated with an excess of sulfur. ^[1]

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. ^[2]

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. ^[3] It adopts a layered crystal structure that contains square planar palladium centres and trigonal pyramidal sulfur centres. ^[2]

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. ^[2]

See also

• Pyrite
• Marcasite
• Platinum disulfide
• Platinum diselenide

References

1. Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 1152. doi:10.1016/C2009-0-30414-6. ISBN   978-0-08-037941-8.
2. Grønvold, Fredrik; Røst, Erling (1956). "On the Sulfides, Selenides, and Tellurides of Palladium". Acta Chemica Scandinavica. 10: 1620–1634. doi: 10.3891/acta.chem.scand.10-1620 .
3. Selb, Elisabeth; Götsch, Thomas; Janka, Oliver; Penner, Simon; Heymann, Gunter (2017). "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". Z. Anorg. Allg. Chem. 643 (21): 1415–1423. doi: 10.1002/zaac.201700140 .