Journal
DALTON TRANSACTIONS
Volume 53, Issue 1, Pages 40-44Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d3dt03673a
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The inorganic pyrocarbonate salt Na-2[C2O5] has been synthesized and its crystal structure has been determined. The crystal structure is characterized by alternating layers of Na+-cations and [C2O5](2-)-complex anions.
The inorganic pyrocarbonate salt Na-2[C2O5] crystallizes in the acentric, monoclinic space group P2(1) 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. Na-2[C2O5] was synthesized in a laser-heated diamond anvil cell at 20(2) GPa by heating a mixture of Na-2[CO3] + CO2 to approximate 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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