K4Fe4P5O20: A New Mixed Valence Microporous Compound with Elliptical Eight-Ring Channels

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• 作者：Zhangzhen He ; Weilong Zhang ; Wendan Cheng ; Atsushi Okazawa ; Norimichi Kojima
• 刊名：Inorganic Chemistry
• 出版年：2012
• 出版时间：July 16, 2012
• 年：2012
• 卷：51
• 期：14
• 页码：7469-7471
• 全文大小：235K
• 年卷期：v.51,no.14(July 16, 2012)
• ISSN：1520-510X

文摘

A new small-pore compound K₄Fe₄P₅O₂₀ was obtained by conventional solid-state reaction in a closed crucible. The crystal structure is constructed by Fe₄P₅O₂₀ units forming chains along the c axis and elliptical eight-ring channels on the a鈥?i>b plane in which K cations locate inside. Such structural characteristics seem to be quite similar to those seen in the natrolite family. However, Fe ions in K₄Fe₄P₅O₂₀ have trigonal鈥揵ipyramidal instead of common tetrahedral coordination. Furthermore, our experimental results combined from magnetic susceptibility and ⁵⁷Fe M枚ssbauer spectrum measurements show mixed valence Fe³⁺/Fe²⁺ in the titled material. To the best of our knowledge, this is the first example that contains mixed valence iron ions in a so-called natrolite framework.