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Spahr D, Bayarjargal L, Bykov M, Brüning L, Reuter TH, Milman V, Liermann HP, Winkler B. High-pressure synthesis of acentric sodium pyrocarbonate, Na 2[C 2O 5]. Dalton Trans 2023; 53:40-44. [PMID: 38054559 DOI: 10.1039/d3dt03673a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2023]
Abstract
The inorganic pyrocarbonate salt Na2[C2O5] crystallizes in the acentric, monoclinic space group P21 with Z = 2. It contains monovalent alkali metal cations together with isolated pyrocarbonate anions. The [C2O5]2--groups consist of two planar [CO3]2--groups which are slightly tilted with respect to each other around the bridging oxygen atom. Na2[C2O5] was synthesized in a laser-heated diamond anvil cell at 20(2) GPa by heating a mixture of Na2[CO3] + CO2 to ≈800(200) K. Its crystal structure was obtained by single crystal synchrotron X-ray diffraction and confirmed by density functional theory-based calculations in combination with Raman spectroscopy. Second harmonic generation measurements verified the acentric space group symmetry. The crystal structure is characterized by alternating layers of Na+-cations and [C2O5]2--complex anions.
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Affiliation(s)
- Dominik Spahr
- Goethe University Frankfurt, Institute of Geosciences, Altenhöferallee 1, 60438 Frankfurt, Germany.
| | - Lkhamsuren Bayarjargal
- Goethe University Frankfurt, Institute of Geosciences, Altenhöferallee 1, 60438 Frankfurt, Germany.
| | - Maxim Bykov
- Goethe University Frankfurt, Institute of Inorganic and Analytical Chemistry, Max-von-Laue-Straße 7, 60438 Frankfurt, Germany
- University of Cologne, Institute of Inorganic Chemistry, Greinstraße 6, 50939 Cologne, Germany
| | - Lukas Brüning
- University of Cologne, Institute of Inorganic Chemistry, Greinstraße 6, 50939 Cologne, Germany
| | - Tim H Reuter
- Goethe University Frankfurt, Institute of Geosciences, Altenhöferallee 1, 60438 Frankfurt, Germany.
| | - Victor Milman
- Dassault Systèmes BIOVIA, 334 Cambridge Science Park, CB4 0WN Cambridge, UK
| | | | - Björn Winkler
- Goethe University Frankfurt, Institute of Geosciences, Altenhöferallee 1, 60438 Frankfurt, Germany.
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Spahr D, Bayarjargal L, Haussühl E, Luchitskaia R, Friedrich A, Milman V, Fedotenko T, Winkler B. Twisted [C 2O 5] 2--groups in Ba[C 2O 5] pyrocarbonate. Chem Commun (Camb) 2023; 59:11951-11954. [PMID: 37747265 DOI: 10.1039/d3cc03324d] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/26/2023]
Abstract
The inorganic pyrocarbonate salt Ba[C2O5] contains twisted pyrocarbonate anions ([C2O5]2-), an atomic arrangement previously not observed in other pyrocarbonates. This unexpected additional structural degree of freedom points towards an enlarged chemical variability in this novel group of compounds. Ba[C2O5] was synthesized in a laser-heated diamond anvil cell at 30(2) GPa by heating a mixture of Ba[CO3] + CO2 to ≈ 1500(200) K. Its crystal structure was solved from single crystal synchrotron X-ray diffraction data and confirmed by density functional theory-based calculations. The two planar [CO3]2--groups of the [C2O5]2--anion are strongly twisted around the bridging oxygen atom. Ba[C2O5] has been observed in the pressure range of 5-30 GPa, where its symmetry is P6/m with Z = 12.
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Affiliation(s)
- Dominik Spahr
- Goethe University Frankfurt, Institute of Geosciences, Altenhöferallee 1, Frankfurt 60438, Germany.
| | - Lkhamsuren Bayarjargal
- Goethe University Frankfurt, Institute of Geosciences, Altenhöferallee 1, Frankfurt 60438, Germany.
| | - Eiken Haussühl
- Goethe University Frankfurt, Institute of Geosciences, Altenhöferallee 1, Frankfurt 60438, Germany.
| | - Rita Luchitskaia
- Goethe University Frankfurt, Institute of Geosciences, Altenhöferallee 1, Frankfurt 60438, Germany.
| | - Alexandra Friedrich
- University of Würzburg, Institute of Inorganic Chemistry, Am Hubland, Würzburg 97074, Germany
| | - Victor Milman
- Dassault Systèmes BIOVIA, 334 Cambridge Science Park, Cambridge CB4 0WN, UK
| | | | - Björn Winkler
- Goethe University Frankfurt, Institute of Geosciences, Altenhöferallee 1, Frankfurt 60438, Germany.
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