首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >Aminoguanidinium(2+) hexafluorozirconate monohydrate: A co-product of preparing the ferroelectric anhydrous salt
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Aminoguanidinium(2+) hexafluorozirconate monohydrate: A co-product of preparing the ferroelectric anhydrous salt

机译:氨基胍盐(2+)六氟锆酸一水合物:制备铁电无水盐的副产物

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Preparation of anhydrous aminoguanidinium(2+) hexafluorozirconate, CN4H8ZrF6, shown previously to satisfy the structural criteria for ferroelectricity [Abrahams et al. (1996). Acta Cryst. B52, 806-809], generally results in the co-formation of a series of related fluorozirconates. The structure of the monohydrate salt, one of the coproducts, has been redetermined to improve understanding of the preparation pathway, locate the H atoms and compare corresponding atom positions [Gerasimenko er al. (1989). Koord. Khim. 15, 130-135]. The positions of the H atoms were not established in the latter study. All 16 H atoms in the two symmetry-independent CN4H8(2+) ions are now located and refined, with R-1 = 0.0299 and S = 1.119. Both independent water molecules are disordered. Normal probability analysis reveals uncompensated error and/or underestimated uncertainty associated with ten non-H-atom position coordinates. The relative concentrations of HF, CN4H7Cl and H2ZrF6 are among the major variables controlling the formation of the related fluorozirconates. [References: 14]
机译:制备的无水氨基胍(2+)六氟锆酸酯CN4H8ZrF6,先前已证明满足铁电结构标准[Abrahams等。 (1996)。 Acta Cryst。 [B52,806-809]通常导致一系列相关的氟锆酸盐的共形成。已重新确定了一水合盐(一种副产物)的结构,以增进对制备途径的理解,确定H原子并比较相应的原子位置[Gerasimenko等。 (1989)。 Koord。希姆15,130-135]。 H原子的位置未在后面的研究中确定。现在,两个对称独立的CN4H8(2+)离子中的所有16个H原子都被定位和精炼,R-1 = 0.0299和S = 1.119。两个独立的水分子都是无序的。正态概率分析显示与十个非H原子位置坐标相关的未补偿误差和/或低估不确定性。 HF,​​CN4H7Cl和H2ZrF6的相对浓度是控制相关氟锆酸盐形成的主要变量。 [参考:14]

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