Protactinium (V) iodide

General
Surname	Protactinium (V) iodide
other names	Protactinium pentaiodide
Molecular formula	PaI 5
Brief description	black solid
External identifiers / databases
Wikidata	Q17325762
properties
Molar mass	865.56 g mol −1
Physical state	firmly
Hazard and safety information
	; Radioactive
GHS hazard labeling ; no classification available
GHS hazard labeling ; no classification available
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Protactinium (V) iodide is a chemical compound of protactinium from the group of iodides .

presentation

Protactinium (V) iodide can be obtained by reacting protactinium with iodine at 450 ° C.

{\ displaystyle {\ ce {2 Pa + 5 I2 -> 2 PaI5}}}

It is also possible to produce it by iodizing protactinium (V) oxide with silicon tetraiodide at 600 to 700 ° C

{\ displaystyle {\ ce {2 Pa2O5 + 5 SiI4 -> 4 PaI5 + 5 SiO2}}}

or by re-halogenation of protactinium (V) chloride or protactinium (V) bromide with silicon tetraiodide

{\ displaystyle {\ ce {4 PaCl5 + 5 SiI4 -> 4 PaI5 + 5 SiCl4}}}

{\ displaystyle {\ ce {4 PaBr5 + 5 SiI4 -> 4 PaI5 + 5 SiBr4}}}

or by reaction of protactinium (V) chloride with hydrogen iodide or protactinium (V) oxide with aluminum iodide

{\ displaystyle {\ ce {PaCl5 + 5 HI -> PaI5 + 5 HCl}}}

{\ displaystyle {\ ce {3 Pa2O5 + 10 AlI3 -> 6 PaI5 + 5 Al2O3}}}

It can also be produced by reacting protactinium carbide PaC with iodine at 400 ° C.

properties

Protactinium (V) iodide is an extremely moisture and air sensitive black crystalline solid that looks brown when powdered. It is soluble in anhydrous acetonitrile and ethanol , insoluble in trichloromethane , carbon tetrachloride , isopentane and cyclohexane . It sublimates with metallic-green-shimmering vapor, which appears deep ruby red colored in the transmitted light. The compound has an orthorhombic crystal structure . By thermal decomposition of protactinium (V) iodide on a heated tungsten wire, metallic protactinium was obtained for the first time in 1934 by Aristid von Grosse .

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g Georg Brauer , with the assistance of Marianne Baudler u. a. (Ed.): Handbook of Preparative Inorganic Chemistry . 3rd, revised edition. tape I . Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , pp. 1179 .
↑ The hazards emanating from radioactivity do not belong to the properties to be classified according to the GHS labeling. With regard to other hazards, this substance has either not yet been classified or a reliable and citable source has not yet been found.
^ ^A ^b Lester R. Morss, Norman M. Edelstein, J. Fuger (Ed.): The Chemistry of the Actinide and Transactinide Elements (Set Vol. 1-6) . Volumes 1-6. Springer, Dordrecht 2010, ISBN 978-94-007-0211-0 , p. 198, 1795 (English, limited preview in Google Book Search).
^ John Emsley: Nature's Building Blocks: An AZ Guide to the Elements . Oxford University Press, 2001, pp. 348 ( limited preview in Google Book search).

[brauer-1] ↑ ^a ^b ^c ^d ^e ^f ^g Georg Brauer , with the assistance of Marianne Baudler u. a. (Ed.): Handbook of Preparative Inorganic Chemistry . 3rd, revised edition. tape I . Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , pp. 1179 .

[NV-2] The hazards emanating from radioactivity do not belong to the properties to be classified according to the GHS labeling. With regard to other hazards, this substance has either not yet been classified or a reliable and citable source has not yet been found.

[Lester_R._Morss,_Norman_M._Edelstein,_J._Fuger-3] A ^b Lester R. Morss, Norman M. Edelstein, J. Fuger (Ed.): The Chemistry of the Actinide and Transactinide Elements (Set Vol. 1-6) . Volumes 1-6. Springer, Dordrecht 2010, ISBN 978-94-007-0211-0 , p. 198, 1795 (English, limited preview in Google Book Search).

[John_Emsley-4] John Emsley: Nature's Building Blocks: An AZ Guide to the Elements . Oxford University Press, 2001, pp. 348 ( limited preview in Google Book search).