Palladium(II) iodide

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]

Palladium(II) iodide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.029.276
EC Number
  • 232-203-7
  • InChI=1S/2HI.Pd/h2*1H;/q;;+2/p-2 checkY
    Key: HNNUTDROYPGBMR-UHFFFAOYSA-L checkY
  • InChI=1/2HI.Pd/h2*1H;/q;;+2/p-2
    Key: HNNUTDROYPGBMR-NUQVWONBAU
  • [Pd](I)I
Properties
I2Pd
Molar mass 360.229 g/mol
Appearance Black crystals
Density 6,003 g/cm3
Melting point 350 °C (decomposes)
Insoluble in water
Hazards
GHS labelling:[1]
GHS07: Exclamation mark
Warning
H315, H319, H335
Related compounds
Other anions
 Palladium(II) fluoride
Palladium(II) chloride
Palladium(II) bromide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

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. 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.
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