Sr[C<sub>2</sub>O<sub>5</sub>] is an Inorganic Pyrocarbonate Salt with [C<sub>2</sub>O<sub>5</sub>]<sup>2–</sup> Complex Anions
Dominik Spahr, Jannes König, Lkhamsuren Bayarjargal, Victor Milman, A. Ya. Perlov, Hanns‐Peter Liermann, Björn Winkler
Abstract
The synthesis of a novel type of carbonate, namely of the inorganic pyrocarbonate salt Sr[C2O5], which contains isolated [C2O5]2–-groups, significantly extends the crystal chemistry of inorganic carbonates beyond the established sp2- and sp3-carbonates. We synthesized Sr[C2O5] in a laser-heated diamond anvil cell by reacting Sr[CO3] with CO2. By single crystal synchrotron diffraction, Raman spectroscopy, and density functional theory (DFT) calculations, we show that it is a pyrocarbonate salt. Sr[C2O5] is the first member of a novel family of inorganic carbonates. We predict, based on DFT calculations, that further inorganic pyrocarbonates can be obtained and that these will be relevant to geoscience and may provide a better understanding of reactions converting CO2 into useful inorganic compounds.