The discovery of a new Fe^II oxalate framework of composition K₂Fe[(C₂O₄)₂(H₂O)₂]·0.18H₂O is reported. Its crystal structure was solved by means of single crystal and powder X-ray diffraction. The new organic–inorganic hybrid compound crystallizes in the orthorhombic space group Pca2₁ with unit-cell parameters: a = 12.0351 (4) Å, b = 15.1265 (5) Å, c = 10.5562 (4) Å. This crystal structure, containing eight chemical formula, consists of a succession of FeO₄(H₂O)₂ octahedra and K⁺ cations growing along b direction. Magnetization measurements indicate that the title compound is paramagnetic over the investigated temperature range (2–300 K). Both magnetization and ⁵⁷Fe Mössbauer data indicate that Fe²⁺ is in a high-spin state.

中文翻译：

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新型草酸亚铁钾盐K2Fe[(C2O4)2(H2O)2]·0.18H2O的结构

报道了一种新的草酸铁^II骨架的发现，其组成为K ₂ Fe[(C ₂ O ₄ ) ₂ (H ₂ O) ₂ ]·0.18H _{2 O。}通过单晶和粉末X射线衍射解析了其晶体结构。新的有机-无机杂化化合物在斜方空间群Pca 2 ₁中结晶，晶胞参数为：a = 12.0351 (4) Å, b = 15.1265 (5) Å, c = 10.5562 (4) Å。该晶体结构包含八个化学式，由一系列沿b方向生长的FeO ₄ (H ₂ O) ₂八面体和K ⁺阳离子组成。磁化测量表明标题化合物在研究的温度范围 (2–300 K) 内具有顺磁性。磁化强度和⁵⁷ Fe 穆斯堡尔数据都表明 Fe ²⁺处于高自旋状态。