Protactinium(V) iodide

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Protactinium(V) iodide
Identifiers
CAS Number	17497-66-4^Y
Properties
Chemical formula	I₅Pa
Molar mass	865.55823 g·mol⁻¹
Appearance	black needle crystals^[1]
Related compounds
Other anions	Protactinium(V) fluoride Protactinium(V) chloride Protactinium(V) bromide
Other cations	Praseodymium(III) iodide Thorium(IV) iodide Uranium(IV) iodide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Protactinium(V) iodide is an inorganic compound, with the chemical formula of PaI₅.

Preparation

It can be prepared by the reaction of metals protactinium and iodine, or by reacting protactinium(V) chloride, protactinium(V) bromide or protactinium(V) oxide with silicon tetraiodide.^[2]

Properties

It reacts with antimony trioxide in a vacuum at 150 °C to give the iodide oxides PaOI₃ and PaO₂I; it reacts with protactinium(V) bromide at 350 °C to obtain mixed halides PaBr₃I₂.^[2] It reacts with the monocarbide at 600 °C to give tetraiodide.^[3]

Aristid von Grosse was able to produce pure metallic protactinium with the decomposition of protactinium(V) iodide.^[4]^[5]

When heated at 300 °C for a long time, it decomposes and iodine is released:^[1]

PaI₅ → PaI₃ + I₂

References

^ ^a ^b V. Scherer, F. Weigel, M. Van Ghemen (December 1967). "Evidence for the existence of protactinium(III) in solid state". Inorganic and Nuclear Chemistry Letters. 3 (12): 589–595. doi:10.1016/0020-1650(67)80033-3. Archived from the original on 2018-06-17. Retrieved 2021-09-25.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^ ^a ^b D. Brown, J. F. Easey, P. J. Jones (1967). "Protactinium(V) iodides". Journal of the Chemical Society A: Inorganic, Physical, Theoretical: 1698–1702. doi:10.1039/j19670001698. ISSN 0022-4944. Retrieved 2021-09-25.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^ Brown, David; De Paoli, Giovanni; Whittaker, Brian. Conversion of protactinium monocarbide to the penta- and tetrahalides. Journal of the Chemical Society, Dalton Transactions: Inorganic Chemistry (1972-1999), 1976. 14: 1336-1338.
^ von Grosse, Aristid (1934). "Element 91". Science. 80 (2084): 512–516. Bibcode:1934Sci....80..512G. doi:10.1126/science.80.2084.512. PMID 17734249.
^ von Grosse, Aristid (1935). "Zur Herstellung von Protactinium" [For the production of protactinium]. Berichte der deutschen chemischen Gesellschaft (A and B Series) (in German). 68 (2): 307–309. doi:10.1002/cber.19350680218.

v t e Protactinium compounds
Pa(II)	PaO
Pa(III)	PaH₃ PaN
Pa(IV)	PaO₂ PaCl₄ PaBr₄ PaF₄ PaI₄ PaOCl₂ PaC Pa(C₈H₈)₂
Pa(V)	Pa₂O₅ PaF₅ PaCl₅ PaBr₅ PaI₅ PaO₂F PaO₂Cl PaO₂I PaO(NO₃)₃

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