Aluminium carbonate

Aluminium Carbonate

Names
IUPAC name Dialuminium Tricarbonate
Identifiers
CAS Number	14455-29-9  Y
3D model (JSmol)	Interactive image
ChemSpider	10606614  Y
ECHA InfoCard	100.034.930
PubChem CID	10353966
UNII	1GA689N629  Y
CompTox Dashboard (EPA)	DTXSID30891680 DTXSID40201756, DTXSID30891680
InChI InChI=1S/3CH2O3.2Al/c3*2-1(3)4;;/h3*(H2,2,3,4);;/q;;;2*+3/p-6 Key: PPQREHKVAOVYBT-UHFFFAOYSA-H
SMILES C(=O)([O-])[O-].C(=O)([O-])[O-].C(=O)([O-])[O-].[Al+3].[Al+3]
Properties
Chemical formula	Al2(CO3)3
Molar mass	233.99 g/mol
Appearance	white powder, unstable
Density	3.14 g/cm3
Solubility in water	reacts
Structure [1]
Crystal structure	orthorhombic
Space group	Fdd2
Lattice constant	a = 21.989 Å, b = 10.176 Å, c = 4.4230 Å
Lattice volume (V)	989.7
Formula units (Z)	8
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N  verify  (what is  YN ?) Infobox references

Aluminium carbonate (Al₂(CO₃)₃), is a carbonate of aluminium. It is not well characterized; one authority says that simple carbonates of aluminium are not known. ^[2] However related compounds are known, such as the basic sodium aluminium carbonate mineral dawsonite (NaAlCO₃(OH)₂) and hydrated basic aluminium carbonate minerals scarbroite (Al₅(CO₃)(OH)₁₃•5(H₂O)) and hydroscarbroite (Al₁₄(CO₃)₃(OH)₃₆•nH₂O). ^{[3] [4] [5]}

Preparation

For many years there was no evidence for the existence of a simple aluminium carbonate, Al₂(CO₃)₃, as the combination of Al³⁺ and carbonates are sufficiently alkaline to precipitate aluminium hydroxide and produce carbon dioxide: ^[6]

${\displaystyle {\ce {2[Al(H2O)6]^{3+}(aq) + 3CO3^{2-}(aq) -> 2Al(OH)3 (s) + 3CO2 (g) + 9H2O (l)}}}$

However, in 2023, Al₂(CO₃)₃ was produced by heating aluminium oxide at 2300 °C under 24 GPa of carbon dioxide. The resulting solid is stable in air and at room temperature. ^[7]

Some minerals contain both aluminium and carbonate. Dawsonite has the formula NaAlCO₃(OH)₂. Hydrotalcites, both synthetic and natural, are layered metal hydroxides comprised in part of aluminium and carbonate. ^[8]

Surface carbonate species readily form upon exposure of aluminium oxide to CO₂. ^[9]

References

1. Bayarjargal, Lkhamsuren; Spahr, Dominik; Milman, Victor; Marquardt, Julien; Giordano, Nico; Winkler, Björn (2023). CCDC 2259169: Experimental Crystal Structure Determination (Report). Cambridge Crystallographic Data Centre. doi:10.5517/ccdc.csd.cc2ftvfk.
2. Anthony John Downs, (1993), Chemistry of Aluminium, Gallium, Indium, and Thallium, Springer, ISBN   978-0-7514-0103-5
3. "Scarbroite". www.mindat.org.
4. "Hydroscarbroite". www.mindat.org.
5. "Dawsonite". www.mindat.org. Retrieved 2020-12-14.
6. Moody, Bernard (2013). Comparative Inorganic Chemistry. Elsevier. p. 311. ISBN   9781483280080.
7. Bayarjargal, Lkhamsuren; Spahr, Dominik; Milman, Victor; Marquardt, Julien; Giordano, Nico; Winkler, Björn (28 August 2023). "Anhydrous Aluminum Carbonates and Isostructural Compounds". Inorganic Chemistry. 62 (34): 13910–13918. doi:10.1021/acs.inorgchem.3c01832. PMID   37579301. S2CID   260898136.
8. Costantino, Umberto; Marmottini, Fabio; Nocchetti, Morena; Vivani, Riccardo (1998). "New Synthetic Routes to Hydrotalcite-Like Compounds − Characterisation and Properties of the Obtained Materials". European Journal of Inorganic Chemistry. 1998 (10): 1439–1446. doi:10.1002/(SICI)1099-0682(199810)1998:10<1439::AID-EJIC1439>3.0.CO;2-1.
9. Parkyns, N. D. (1969-01-01). "The surface properties of metal oxides. Part II. An infrared study of the adsorption of carbon dioxide on γ-alumina". Journal of the Chemical Society A: Inorganic, Physical, Theoretical: 410–417. doi:10.1039/J19690000410. ISSN   0022-4944.