Sodium bis(carbonato)cuprate(II)

Sodium bis(carbonato)cuprate(II)
Names
Other names
  • Sodium copper carbonate
  • Sodium dicarbonatocuprate(II)
Identifiers
3D model (JSmol)
  • InChI=1S/2CH2O3.Cu.2Na/c2*2-1(3)4;;;/h2*(H2,2,3,4);;;/q;;+2;2*+1/p-4
    Key: APOKAJMQKXINAN-UHFFFAOYSA-J
  • C(=O)([O-])[O-].C(=O)([O-])[O-].[Na+].[Na+].[Cu+2]
Properties
Na2[Cu(CO3)2]
Molar mass 229.542 g mol−1 (anhydrous) 283.587 g/mol−1 (trihydrate)
Appearance royal blue solid[1] (anhydrous)
Density 2.984 g/cm3 (anhydrous) 2.27 g/cm3 (trihydrate)
Melting point decomposes
Structure[1]
monoclinic
p21/a
a = 6.18 Å, b = 8.19 Å, c = 5.64 Å
α = 90°, β = 116.2°, γ = 90°
2 units per cell
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Sodium bis(carbonato)cuprate(II) is a complex compound of copper containing the carbonato ligand, with the chemical formula Na2[Cu(CO3)2]. It forms royal blue, monoclinic crystals. A trihydrate exists.

Occurrence

The anhydrous form occurs naturally as the mineral juangodoyite,[2] while the trihydrate is found as chalconatronite.[3]

It can also be found as a corrosion product in objects made of copper alloy[4][5] and formed as an intermediate in the production of Cu/ZnO/Al2O3 catalysts.[6]

Properties

The compound decomposes in water but can be recrystallized from a concentrated solution of sodium carbonate containing bicarbonate.[7]

Like all other copper(II) compounds, sodium bis(carbonato)cuprate(II) is paramagnetic due to the unpaired electron in its 3d orbital.

Preparation

The trihydrate can be prepared by treating a sodium carbonate-bicarbonate solution with aqueous copper(II) acetate dropwise at 50 °C under stirring. A clear, deep blue solution free of basic copper carbonate is obtained. Needle-like crystals of the product form upon cooling.[7]

The anhydrous compound can be prepared by heating the trihydrate in boiling saturated aqueous sodium carbonate-bicarbonate solution. Elongated, royal blue insoluble single crystals are obtained.[1]

The potassium salt, potassium bis(carbonato)cuprate(II) (K2Cu(CO3)2), has been characterized by single-crystal X-ray diffraction.[8]

Sodium salts of carbonato complexes of other metals including magnesium, cobalt, nickel, and zinc have also been investigated.[7]

References

  1. 1 2 3 Healy, P. C.; White, A. H. (1972). "Crystal structure and physical properties of anhydrous sodium copper carbonate". Journal of the Chemical Society, Dalton Transactions (17): 1913. doi:10.1039/dt9720001913. ISSN 0300-9246.
  2. ↑ "Juangodoyite". www.mindat.org. Retrieved 2026-05-30.
  3. ↑ "Chalconatronite". www.mindat.org. Retrieved 2026-05-30.
  4. ↑ Horie, C.V.; Vint, J.A. (1982-11-01). "Chalconatronite: a by-product of conservation?". Studies in Conservation. 27 (4): 185–186. doi:10.1179/sic.1982.27.4.185. ISSN 0039-3630.
  5. ↑ Fischer, Andrea; Eggert, Gerhard; Stelzner, Jörg (2020-04-02). "When Glass and Metal Corrode Together, VI: Chalconatronite". Studies in Conservation. 65 (3): 152–159. doi:10.1080/00393630.2019.1677081. ISSN 0039-3630.
  6. ↑ Kaluza, Stefan; Behrens, Malte; Schiefenhövel, Nora; Kniep, Benjamin; Fischer, Richard; Schlögl, Robert; Muhler, Martin (2011-01-10). "A Novel Synthesis Route for Cu/ZnO/Al 2 O 3 Catalysts used in Methanol Synthesis: Combining Continuous Consecutive Precipitation with Continuous Aging of the Precipitate". ChemCatChem. 3 (1): 189–199. doi:10.1002/cctc.201000329. ISSN 1867-3880.
  7. 1 2 3 Applebey, Malcolm Percival; Lane, Kenneth Westmacott (1918-01-01). "LI.—Double carbonates of sodium and potassium with the heavy metals". Journal of the Chemical Society, Transactions. 113: 609–622. doi:10.1039/CT9181300609. ISSN 0368-1645.
  8. ↑ Farrand, A; Gregson, Ak; Skelton, Bw; White, Ah (1980-02-01). "Crystal structure of the ferromagnetic polymer potassium Bis(carbonato)cuprate(II)". Australian Journal of Chemistry. 33 (2): 431–434. doi:10.1071/CH9800431. ISSN 0004-9425.

Further reading

This page is issued from Wikipedia. The text is available under Creative Commons Attribution-Share Alike 4.0 unless otherwise noted. Additional terms may apply for the media files.