Aluminium dihydrogenphosphate describes inorganic compounds with the formula Al(H2PO4)3.xH2O where x = 0 or 3. They are white solids. Upon heating these materials convert sequentially to a family of related polyphosphate salts including aluminium triphosphate (AlH2P3O10.2H2O), aluminium hexametaphosphate (Al2P6O18), and aluminium tetrametaphosphate (Al4(P4O12)3). Some of these materials are used for fireproofing and as ingredients in specialized glasses.[2]
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3D model (JSmol)
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| ChemSpider | |
| ECHA InfoCard | 100.033.508 |
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PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |
| AlH6O12P3 | |
| Molar mass | 317.939 g·mol−1 |
| Appearance | white solid |
| Density | 2.37 g/cm3 |
| Hazards | |
| GHS labelling: | |
 [1]
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| H318 | |
| P280, P305+P351+P338, P310 | |
| Safety data sheet (SDS) | External SDS |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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According to analysis by X-ray crystallography, the structure consists of a coordination polymer featuring octahedral Al3+ centers bridged by tetrahedral dihydrogen phosphate ligands. The dihydrogen phosphate ligands are bound to Al3+ as monodentate ligands.[3]
References
edit- ^ "Aluminum Phosphate Monobasic". American Elements. Retrieved January 21, 2019.
- ^ Klaus Schrödter; Gerhard Bettermann; Thomas Staffel; Friedrich Wahl; Thomas Klein; Thomas Hofmann (2008). "Phosphoric Acid and Phosphates". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a19_465.pub3. ISBN 978-3527306732. S2CID 94458523.
- ^ Brodalla, D.; Kniep, R.; Mootz, D. (1981). "Eine neue Form von Al(H2PO4)3 mit dreidimensionaler Al-O-P Vernetzung" [A new form of Al(H2PO4)3 with three-dimensional Al-O-P crosslinking]. Zeitschrift für Naturforschung B. 36: 907–909. doi:10.1515/znb-1981-0803.