Ceric iodide

Crystal structure
	__ Ce 3+ __ I -
Space group	I 4 / mmm (No. 139)
General
Surname	Ceric iodide
Ratio formula	CeI 2
Brief description	bronze colored solid
External identifiers / databases
Wikidata	Q16830827
properties
Molar mass	393.92 g mol −1
Physical state	firmly
Melting point	808 ° C
safety instructions
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 .

Cerdiiodide is an inorganic chemical compound of cerium from the group of iodides .

Extraction and presentation

Cerium diiodide can be obtained by reducing cerium (III) iodide with cerium in a vacuum at 800 ° C to 900 ° C.

{\ displaystyle \ mathrm {Ce + 2 \ CeI_ {3} \ longrightarrow 3 \ CeI_ {2}}}

The reaction of cerium with ammonium iodide in liquid ammonia at −78 ° C is also possible. First, the ammonia from cerium diiodide is obtained, which can then be broken down at around 200 ° C. in a high vacuum.

{\ displaystyle \ mathrm {Ce + 2 \ NH_ {4} I \ longrightarrow CeI_ {2} +2 \ NH_ {3} + H_ {2}}}

The compound was first synthesized in 1961 by John D. Corbett.

properties

Cerdiiodide is an opaque, dark, compact solid with a strong gloss and a metal-like appearance and character. Here, Cer is trivalent, corresponding to Ce ³⁺ (I ^- ) ₂ e ^- . The connection is extremely hygroscopic and can only be stored and handled under carefully dried protective gas or in a high vacuum. In air, it changes into hydrates with moisture absorption , but these are unstable and more or less quickly transform into oxide iodides with the evolution of hydrogen. These processes take place much faster with water. Like lanthanum diiodide and praseodymium diiodide, it crystallizes in the MoSi ₂ structure type with the space group I 4 / mmm (space group no. 139) . Template: room group / 139

Individual evidence

^ ^A ^b William M. Haynes: CRC Handbook of Chemistry and Physics, 93rd Edition . CRC Press, 2012, ISBN 1-4398-8049-2 , pp. 4–56 ( limited preview in Google Book Search).
↑ ^a ^b ^c ^d Georg Brauer (Ed.), With the collaboration of Marianne Baudler a . a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 1081.
↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
↑ Angelika Jungmann, R. Claessen, R. Zimmermann, GE Meng, P. Steiner, S. Hüfner, S. Tratzky, K. Stöwe, HP Beck: Photoemission of LaI2 and CeI2. In: Zeitschrift für Physik B Condensed Matter. 97, 1995, pp. 25-34, doi : 10.1007 / BF01317584 .
↑ Jane E. Macintyre: Dictionary of Inorganic Compounds . CRC Press, 1992, ISBN 0-412-30120-2 , pp. 2820 ( limited preview in Google Book search).
^ F. Hulliger: Structural Chemistry of Layer-Type Phases . Springer, 1976, ISBN 90-277-0714-6 , pp. 247 ( limited preview in Google Book search).

[William_M._Haynes-1] A ^b William M. Haynes: CRC Handbook of Chemistry and Physics, 93rd Edition . CRC Press, 2012, ISBN 1-4398-8049-2 , pp. 4–56 ( limited preview in Google Book Search).

[brauer-2] Georg Brauer (Ed.), With the collaboration of Marianne Baudler a . a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 1081.

[NV-3] This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.

[DOI10.1007/BF01317584-4] Angelika Jungmann, R. Claessen, R. Zimmermann, GE Meng, P. Steiner, S. Hüfner, S. Tratzky, K. Stöwe, HP Beck: Photoemission of LaI2 and CeI2. In: Zeitschrift für Physik B Condensed Matter. 97, 1995, pp. 25-34, doi : 10.1007 / BF01317584 .

[Jane_E._Macintyre-5] Jane E. Macintyre: Dictionary of Inorganic Compounds . CRC Press, 1992, ISBN 0-412-30120-2 , pp. 2820 ( limited preview in Google Book search).

[F._Hulliger-6] F. Hulliger: Structural Chemistry of Layer-Type Phases . Springer, 1976, ISBN 90-277-0714-6 , pp. 247 ( limited preview in Google Book search).