Chemistry:Ammonium dimolybdate
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| Other names
ADM
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3D model (JSmol)
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| Properties | |
| H8N2Mo2O7 | |
| Appearance | white solid |
| Density | 2.97 g/cm3 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
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Ammonium dimolybdate (ADM) is the inorganic compound with the formula (NH4)2Mo2O7. It is a white, water-soluble solid. ADM is an intermediate in the production of molybdenum compounds from its ores. Roasting typical ore produces crude molybdenum(VI) oxides, which can be extracted into aqueous ammonia, affording ammonium molybdate. Heating solutions of ammonium molybdate gives ADM. Upon heating, solid ammonium dimolybdate decomposes to molybdenum trioxide:[1]
- (NH4)2Mo2O7 → 2 MoO3 + 2 NH3 + H2O
In terms of its chemical structure, the anion is a polymeric consisting of distorted octahedral Mo centers liked by tetrahedral molybdate centers.[2] When prepared in the absence of water as its tetrabutylammonium salt, dimolybdate adopts the centrosymmetric structure observed for dichromate.[3]
References
- ↑ Roger F. Sebenik (2005). "Molybdenum and Molybdenum Compounds". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a16_655. ISBN 3527306730.
- ↑ Armour, A. W.; Drew, M. G. B.; Mitchell, P. C. H. "Crystal and molecular structure and properties of ammonium dimolybdate" Journal of the Chemical Society, Dalton Transactions,1975, p1493-p1496. {{DOI: 10.1039/DT9750001493}}
- ↑ Day, V. W.; Klemperer, W. G. (1985). "Metal Oxide Chemistry in Solution: The Early Transition Metal Polyoxoanions". Science 228 (4699): 533–541. doi:10.1126/science.228.4699.533. PMID 17736064. Bibcode: 1985Sci...228..533D.
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