Protactinium(V) iodide
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| Name = Protactinium(V) iodide
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| CASNo = 17497-66-4
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| Section2 = {{Chembox Properties
| Pa=1 | I=5
| Appearance = black needle crystals
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| Section4 = {{Chembox Related
|OtherAnions = Protactinium(V) fluoride
Protactinium(V) chloride
Protactinium(V) bromide
|OtherCations = Praseodymium(III) iodide
Thorium(IV) iodide
Uranium(IV) iodide}}
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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.{{cite journal|journal=Journal of the Chemical Society A: Inorganic, Physical, Theoretical|language=en|issn=0022-4944|date=1967|pages=1698–1702|doi=10.1039/j19670001698|url=http://xlink.rsc.org/?DOI=j19670001698|title=Protactinium(V) iodides|accessdate=2021-09-25|author=D. Brown, J. F. Easey, P. J. Jones|url-access=subscription}}
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. It reacts with the monocarbide at 600 °C to give tetraiodide.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.
Aristid von Grosse was able to produce pure metallic protactinium with the decomposition of protactinium(V) iodide.{{Cite journal
| first = Aristid | last = von Grosse
| journal = Science
| year = 1934
| title = Element 91
| volume = 80
| issue = 2084
| pages = 512–516
| doi = 10.1126/science.80.2084.512
| pmid = 17734249| bibcode = 1934Sci....80..512G
}}{{Cite journal| doi = 10.1002/cber.19350680218 | title = Zur Herstellung von Protactinium | trans-title = For the production of protactinium | language = German | year = 1935 | last = von Grosse | first = Aristid | journal = Berichte der deutschen chemischen Gesellschaft (A and B Series) | volume = 68 | pages = 307–309 | issue = 2}}
When heated at 300 °C for a long time, it decomposes and iodine is released:{{cite journal|journal=Inorganic and Nuclear Chemistry Letters|volume=3|issue=12|language=en|date=December 1967|pages=589–595|doi=10.1016/0020-1650(67)80033-3|url=https://linkinghub.elsevier.com/retrieve/pii/0020165067800333|title=Evidence for the existence of protactinium(III) in solid state|accessdate=2021-09-25|author=V. Scherer, F. Weigel, M. Van Ghemen|archive-date=2018-06-17|archive-url=https://web.archive.org/web/20180617160211/https://linkinghub.elsevier.com/retrieve/pii/0020165067800333|url-access=subscription}}
: PaI5 → PaI3 + I2
References
{{reflist}}
{{Protactinium compounds}}
{{Iodides}}
{{Actinide halides}}