Molybdenum (II) bromide
Crystal structure | |||||||||||||
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__ Mon 2+ __ Br - | |||||||||||||
General | |||||||||||||
Surname | Molybdenum (II) bromide | ||||||||||||
Ratio formula | MoBr 2 | ||||||||||||
Brief description |
yellow red solid |
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External identifiers / databases | |||||||||||||
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properties | |||||||||||||
Molar mass | 225.75 g mol −1 | ||||||||||||
Physical state |
firmly |
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density |
4.88 g cm −3 |
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Melting point |
700 ° C (decomposition) |
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solubility |
almost insoluble in water |
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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 . |
Molybdenum (II) bromide is an inorganic chemical compound of molybdenum from the group of bromides .
Extraction and presentation
Molybdenum (II) bromide can be obtained by reacting molybdenum (II) chloride with lithium bromide .
Also possible is the preparation by reaction of molybdenum with a bromine - nitrogen mixture at 680 ° C or by disproportionation of molybdenum (III) bromide in vacuum at 600 ° C.
properties
Molybdenum (II) bromide is a diamagnetic , hygroscopic , yellow-red to brown powder that is insoluble in water and acids. It is soluble in hot, concentrated sulfuric acid or in warm, dilute, strong bases (with concentrated bases it decomposes). The addition of hydrochloric acid or hydrobromic acid to the alkaline solution leads to the mixed halides [Mo 6 Br 8 ] Cl 4 or [Mo 6 Br 8 ] I 4 . The crystal structure of molybdenum (II) bromide is isotypic to that of molybdenum (II) chloride.
Individual evidence
- ↑ a b c d Dale L. Perry: Handbook of Inorganic Compounds, Second Edition . Taylor & Francis, 2011, ISBN 1-4398-1462-7 , pp. 279 ( limited preview in Google Book search).
- ^ Jean d'Ans, Ellen Lax, Roger Blachnik: Pocket book for chemists and physicists . Springer, 1998, ISBN 3-642-58842-5 , pp. 572 ( limited preview in Google Book search).
- ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
- ↑ a b c Georg Brauer (Ed.) U. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume III, Ferdinand Enke, Stuttgart 1981, ISBN 3-432-87823-0 , p. 1536.