Ammonium metavanadate
| Ammonium vanadate | |
| Photo of a sample of ammonium vanadate | |
| Names | |
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| IUPAC name
Ammonium trioxovanadate(V)
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| Other names
Ammonium vanadate
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| Identifiers | |
7803-55-6  |
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| ChemSpider | 19968892 |
| Jmol 3D model | Interactive image |
| RTECS number | YWD875000 |
| UNII | FL85PX638G |
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| Properties | |
| NH4VO3 | |
| Molar mass | 116.98 g/mol |
| Appearance | white |
| Density | 2.326 g/cm3 |
| Melting point | decomposes > 70 °C (158 °F; 343 K) |
| Boiling point | Decomposes |
| 4.8 g/1000 ml (20 °C) | |
| Solubility | diethanolamine, ethanolamine |
| Vapor pressure | {{{value}}} |
| Related compounds | |
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Other anions
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Ammonium orthovanadate Ammonium hexavanadate |
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Other cations
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Sodium metavanadate Potassium metavanadate |
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Related compounds
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Vanadium pentoxide |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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| Infobox references | |
Ammonium metavanadate is the inorganic compound with the formula NH4VO3. It is a white solid, although samples are often yellow owing to impurities of V2O5. It is an important intermediate in the purification of vanadium.[1]
Synthesis and structure
The compound is prepared by the addition of ammonium salts to solutions of vanadate, generated by dissolution of V2O5 in base. The compound precipitates as a colorless solid.[2][3]
It adopts a polymeric structure consisting of chains of [VO3]-, formed as corner-sharing VO4 tetrahedra. These chains are interconnected via hydrogen bonds with ammonium ions.[4]
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Uses
Vanadium is often purified from aqueous extracts of slags and ore by selective precipitation of ammonium metavanadate. The material is then roasted to give vanadium pentoxide:[1]
- 2 NH4VO3 → V2O5 + 2 NH3 + H2O
Other
Vanadates can behave as structural mimics of phosphates, and in this way they exhibit biological activity.[5][6]
References
- ↑ 1.0 1.1 Günter Bauer, Volker Güther, Hans Hess, Andreas Otto, Oskar Roidl, Heinz Roller, Siegfried Sattelberger "Vanadium and Vanadium Compounds" in Ullmann's Encyclopedia of Industrial Chemistry, 2005, Wiley-VCH, Weinheim. doi:10.1002/14356007.a27_367
- ↑ G. Brauer "Ammonium Metavanadate" in Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 1272.
- ↑ Robert H. Baker, Harry Zimmerman, R. N. Maxson "Ammonium Metavanadate" Inorganic Syntheses, 1950, Vol. 3, 117-118. doi:10.1002/9780470132340.ch30
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Korbecki, Jan; Baranowska-Bosiacka, Irena; Gutowska, Izabela; Chlubek, Dariusz "Biochemical and medical importance of vanadium compounds" Acta Biochimica Polonica 2012, vol. 59, pp. 195-200.
- ↑ Crans, D. C.; Chatterjee, P. B. "Vanadium biochemistry" Reedijk, Jan; Poeppelmeier, Kenneth, Eds. Comprehensive Inorganic Chemistry II (2013), 3, 323-342. doi:10.1016/B978-0-08-097774-4.00324-7
