Palladium(II) iodide
Identifiers | |
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3D model (
JSmol ) |
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ChemSpider | |
ECHA InfoCard
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100.029.276 |
EC Number |
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PubChem CID
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CompTox Dashboard (EPA)
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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] | |
Warning | |
H315, H319, H335 | |
Related compounds | |
Other anions
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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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Palladium(II) iodide is an inorganic compound of
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
- ^ "C&L Inventory". echa.europa.eu. Retrieved 13 December 2021.
- ^ ISBN 978-3-432-87823-2.
- ^ 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) - ISBN 978-0-470-84289-8, retrieved 2021-03-26
- .
- ISBN 978-3-540-60035-0.