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.

中文翻译：

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Pb[C2O5]的合成和结构：一种无机焦碳酸盐

我们通过将 Pb[CO ₃ ] + CO ₂混合物加热到 ≈2000(200) ，在 30 GPa 的激光加热金刚石砧室 (LH-DAC) 中合成了 Pb[C ₂ O ₅ ]，一种无机焦碳酸盐。 K. 无机焦碳酸盐含有孤立的 [C ₂ O ₅ ] ^2–基团，没有连接官能团。[C ₂ O ₅ ] ^2-基团由两个共享氧的 [CO ₃ ] ^3-基团组成。铅[C ₂ O ₅] 的特点是基于同步加速器的单晶结构细化、拉曼光谱和密度泛函理论计算。Pb[C ₂ O _{5 ] 与 Sr[C 2} O ₅ ]同构，在Z = 4的单斜晶系空间群P 2 ₁ / c中结晶。Pb[C ₂ O ₅ ]的合成证明，就像在其他碳酸盐，阳离子取代是可能的，因此无机焦碳酸盐是一个新的碳酸盐家族，除了已建立的 sp ²和 sp ³碳酸盐。