Palladium(II) iodide is an inorganic compound of palladium and iodine. It is commercially available, though less common than palladium(II) chloride, the usual entry point to palladium chemistry. Three polymorphs are known.[2]

Preparation

Palladium(II) iodide can be obtained by treating a dilute solution of palladium in nitric acid with sodium iodide at 80 °C.[2]

The high-temperature polymorph α-palladium(II) iodide can be produced by reaction of the elements at temperature above 600 °C. The γ-modification is produced as an almost amorphous powder by addition of iodide salts to aqueous H2PdCl4 solution . When heated in dilute hydrogen iodide solution, this polymorph transforms into the β phase at around 140 °C.[3]

Reactions and uses

Palladium(II) iodide is insoluble in water. It reacts with iodide giving PdI42− anion:

PdI2 + 2I− → PdI2−4

It finds use as a catalyst.[4]

Historically, the quantity of palladium in a solution may be determined gravimetrically by precipitation as palladium(II) iodide.[5]

Crystallography

Palladium(II) iodide is an almost X-ray amorphous black powder. The α-modification has an orthorhombic crystal structure with the space group Pnmn(space group no. 58, position 5).[6]

References

  1. ^ "C&L Inventory". echa.europa.eu. Retrieved 13 December 2021.
  2. ^ a b Handbuch der präparativen anorganischen Chemie. 3 (3., umgearb. Aufl ed.). Stuttgart: Enke. 1981. ISBN 978-3-432-87823-2.
  3. ^ Brendel, Kristin; Thiele, Gerhard (2001). "Binäre und Ternäre Verbindungen der Platinmetalle Palladium und Rhodium mit Tellur und Halogenen. Präparationen und strukturelle Charakterisierung". {{cite journal}}: Cite journal requires |journal= (help)
  4. ^ Gabriele, Bartolo; Salerno, Giuseppe (2006), "Palladium(II) Iodide", Encyclopedia of Reagents for Organic Synthesis, American Cancer Society, doi:10.1002/047084289x.rn00658, ISBN 978-0-470-84289-8, retrieved 2021-03-26
  5. ^ Beamish, F. E.; Dale, J. (1938). "Determination of Palladium by Means of Potassium Iodide". Industrial & Engineering Chemistry Analytical Edition. 10 (12): 697. doi:10.1021/ac50128a015.
  6. ^ Ans, Jean d'; Lax, Ellen (1998). Taschenbuch für Chemiker und Physiker (in German). Springer. ISBN 978-3-540-60035-0.
Allikas: http://en.wikipedia.org/wiki/Palladium(II)_iodide
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