Germanium (II) iodide
Crystal structure | ||||||||||||||||
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__ Ge 2+ __ I - | ||||||||||||||||
Space group |
P 3 m 1 (No. 164) |
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General | ||||||||||||||||
Surname | Germanium (II) iodide | |||||||||||||||
other names |
Germanium diiodide |
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Ratio formula | GeI 2 | |||||||||||||||
Brief description |
yellow solid |
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External identifiers / databases | ||||||||||||||||
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properties | ||||||||||||||||
Molar mass | 326.45 g mol −1 | |||||||||||||||
Physical state |
firmly |
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density |
5.37 g cm −3 (25 ° C) |
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Melting point |
428 ° C |
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boiling point |
550 ° C (decomposition) |
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safety instructions | ||||||||||||||||
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As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . |
Germanium (II) iodide is an inorganic chemical compound of germanium from the group of iodides .
Extraction and presentation
Germanium (II) iodide can be obtained by reacting germanium (IV) iodide in hydriodic acid with phosphinic acid and water.
It is also possible to display it by reacting germanium (II) sulfide or germanium (II) oxide with hydriodic acid or from germanium with iodine at 200 - 400 ° C.
Another display option is:
properties
Germanium (II) iodide is a yellow crystalline solid that is stable in dry air at room temperature, but slowly hydrolyzes to germanium (II) hydroxide in the presence of moisture . It is insoluble in hydrocarbons, but not very soluble in trichloromethane and carbon tetrachloride . The compound has a crystal structure of the polytype 2H of the cadmium (II) iodide type (a = 413 pm; c = 679 pm). It disproportionates into germanium (IV) iodide and iodine at 550 ° C. It reacts with ethyne to form a dimeric complex with a cyclic structure.
use
Germanium (II) iodide forms stable ionic adducts with carbenes . It is also used in the electronics industry to produce germanium layers by epitaxy by disproportionation.
Individual evidence
- ^ Jean d'Ans, Ellen Lax, Roger Blachnik: Pocket book for chemists and physicists . Springer DE, 1998, ISBN 3-642-58842-5 , pp. 472 ( 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. 727.
- ↑ a b c d e data sheet Germanium (II) iodide, ≥99.9% trace metals basis from Sigma-Aldrich , accessed on January 19, 2014 ( PDF ).
- ^ A b William M. Haynes: CRC Handbook of Chemistry and Physics, 93rd Edition . CRC Press, 2012, ISBN 1-4398-8049-2 , pp. 4–65 ( limited preview in Google Book Search).
- ^ Wolfgang Kirmse: Carbene Chemistry 2e . Elsevier, 2013, ISBN 0-323-16145-6 , pp. 540 ( limited preview in Google Book search).
- ^ AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , p. 959.
- ↑ Balaram Sahoo: Inorganic Chemistry . PHI Learning Pvt. Ltd., 2012, ISBN 81-203-4308-5 , pp. 321 ( limited preview in Google Book search).
- ^ AG Milnes: Heterojunctions and Metal Semiconductor Junctions . Elsevier, 1972, ISBN 0-323-14136-6 , pp. 104 ( limited preview in Google Book search).