Palladium disulfide
Chemical compound
From Wikipedia, the free encyclopedia
Palladium disulfide is a chemical compound of palladium and sulfur with the chemical formula PdS2.[1]
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| Other names
Palladium(II) disulfide | |||
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3D model (JSmol) |
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| Properties | |||
| PdS2 | |||
| Appearance | grey solid[1] or black crystalline powder[2] metallic crystals | ||
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Other anions |
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Other cations |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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.[3] It adopts a layered crystal structure that contains square planar palladium centres and trigonal pyramidal sulfur centres.[2]
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]
Related compounds
A variety of other compounds in the Pd-S system have been reported, including Pd4S, Pd2.8S, Pd2.2S and PdS.[2]