Synthesis and Structure of Pb[C2O5]: An Inorganic Pyrocarbonate Salt

• Published in: Inorganic chemistry Vol. 61; no. 26; pp. 9855 - 9859
• Main Authors: Spahr, Dominik, König, Jannes, Bayarjargal, Lkhamsuren, Luchitskaia, Rita, Milman, Victor, Perlov, Alexander, Liermann, Hanns-Peter, Winkler, Björn
• Format: Journal Article
• Language: English
• Published: American Chemical Society 04.07.2022
• ISSN: 0020-1669; 1520-510X
• DOI: 10.1021/acs.inorgchem.2c01507

We have synthesized Pb­[C2O5], an inorganic pyrocarbonate salt, in a laser-heated diamond anvil cell (LH-DAC) at 30 GPa by heating a Pb­[CO3] + CO2 mixture to ≈2000(200) K. Inorganic pyrocarbonates contain isolated [C2O5]2– groups without functional groups attached. The [C2O5]2– groups consist of two oxygen-sharing [CO3]3– groups. Pb­[C2O5] was characterized by synchrotron-based single-crystal structure refinement, Raman spectroscopy, and density functional theory calculations. Pb­[C2O5] is isostructural to Sr­[C2O5] and crystallizes in the monoclinic space group P21/c with Z = 4. The synthesis of Pb­[C2O5] demonstrates that, just like in other carbonates, cation substitution is possible and that therefore inorganic pyrocarbonates are a novel family of carbonates, in addition to the established sp2 and sp3 carbonates.