Ammonium dimolybdate
| Names | |
|---|---|
| Other names
ADM | |
| Identifiers | |
| 27546-07-2 | |
| ECHA InfoCard | 100.044.092 |
| 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). | |
| Infobox references | |
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 the solid, ammonium dimolybdate decomposes to molybdenum trioxide:[1]
- (NH4)2Mo2O7 → 2 MoO3 + 2 NH3 + H2O
In terms of its chemical structure, it is a polymeric consisting of distorted octahedral Mo centers liked by tetrahedral molybdate centers.[2]
References
- ↑ Roger F. Sebenik et al. "Molybdenum and Molybdenum Compounds" in Ullmann's Encyclopedia of Chemical Technology 2005; Wiley-VCH, Weinheim. doi:10.1002/14356007.a16_655
- ↑ 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}}
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