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<p>Here, we report the discovery of a new crystalline form of potassium peroxodicarbonate (K<sub>2</sub>[C<sub>2</sub>O<sub>6</sub>]-II), synthesized electrochemically in a 40 wt% potassium carbonate solution at −20&#xa0;°C. Structural analysis reveals a near-planar conformation with a dihedral angle of 147° across the O–O bond, contrasting with the near-perpendicular (93°) arrangement in K<sub>2</sub>[C<sub>2</sub>O<sub>6</sub>]-I. These findings demonstrate that ionic strength during crystallization significantly influences the conformation of the peroxodicarbonate anion, leading to distinct polymorphic forms.</p>

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Synthesis and spectroscopic and structural characterization of a new polymorph of potassium peroxodicarbonate K2[C2O6]

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • Jiajia Shi,
  • Yuexu Wu,
  • Yujia Wang,
  • Tuanyuan Zhang,
  • Fenghong Bai,
  • Yuhui Chen,
  • Heng Zhu

摘要

Here, we report the discovery of a new crystalline form of potassium peroxodicarbonate (K2[C2O6]-II), synthesized electrochemically in a 40 wt% potassium carbonate solution at −20 °C. Structural analysis reveals a near-planar conformation with a dihedral angle of 147° across the O–O bond, contrasting with the near-perpendicular (93°) arrangement in K2[C2O6]-I. These findings demonstrate that ionic strength during crystallization significantly influences the conformation of the peroxodicarbonate anion, leading to distinct polymorphic forms.