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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >ErF3-Rich ternary erbium fluorides with the heavy alkali metals: I. KEr3F10 and RbEr3F10
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ErF3-Rich ternary erbium fluorides with the heavy alkali metals: I. KEr3F10 and RbEr3F10

机译：具有重碱金属的ErF3-富三元氟化：I. KEr3F10和RbEr3F10

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摘要

The conversion of erbium trifluoride (ErF3) with chlorides of the heavy alkali metals (ACl; A = K, Rb and Cs) at 700-800 degrees C in tantalum capsules sealed by arc-welding surprisingly results in the formation of ErF3-rich ternary alkali-metal erbium(III) fluorides with the compositions AEr(3)F(10), (A = K and Rb) or CsEr2F7, respectively. The first-mentioned compounds are characterized by high coordination numbers at the alkali-metal cation (CN(A(+)) = 15 and 16) as well as by a uniform surrounding of the Er3+ cation (CN = 8, square antiprism). In KEr3F10 (cubic, Fm (3) over barm; a = 1154.06(7) pm, Z = 8) eight (Fl)(-) anions always arrange as a cube, whose six faces are each capped by an Er3+ cation. These [(Fl)(8)Er-6](10+) groups constitute a cubic closest sphere-packing with K+ cations in all of the tetrahedral interstices. The [Er-6(mu(3)-Fl)(8)](10+) units are interconnected via the remainder fluoride anions (F2) to build up a three-dimensional framework so that the characteristic [ErF8](5-) polyhedra (d(Er3+-F-) = 220 - 235 pm) emerge. In RbEr3F10, (hexagonal, P6(3)mc; a = 818.43(5), c = 1336.54(8) pm, Z = 4) the analogous [ErF8](5-) polyhedra (d(Er3+-F-) = 219 - 237 pm) initially convene to triple groups [Er3F19](10-) through cis-edge condensation, which are then further connected via F- corners to arrange as a two-dimensional network perpendicular to the c axis. Finally, the cross-linking of these layers is achieved by common F- vertices again, such that large cavities apt to take up the Rb+ cations are formed. A second part of these series will report on the syntheses and crystal structures of the ErF3-poorer AEr(2)F(7)-type representatives with A = K, Rb and Cs.
机译：三氟化（ErF3）与重碱金属的氯化物（ACl; A = K，Rb和Cs）在700-800摄氏度下通过电弧焊接密封的钽胶囊中的转化令人惊讶地导致形成富含ErF3的三元分别具有AEr（3）F（10），（A = K和Rb）或CsEr2F7的碱金属氟化（（III）。首先提到的化合物的特征是在碱金属阳离子上的配位数高（CN（A（+））= 15和16），并且Er3 +阳离子周围均匀（CN = 8，方形反棱镜）。在KEr3F10（立方，Fm（3）超过巴姆; a = 1154.06（7）pm，Z = 8）中，八个（F1）（-）阴离子总是排列成立方体，六个表面分别被Er3 +阳离子覆盖。这些[（F1）（8）Er-6]（10+）基团在所有四面体间隙中与K +阳离子构成立方最接近的球形堆积。 [Er-6（mu（3）-Fl）（8）]（10+）单元通过其余的氟阴离子（F2）相互连接，以建立三维框架，从而使特性[ErF8]（5- ）多面体（d（Er3 + -F-）= 220-235 pm）出现。在RbEr3F10中，（六边形，P6（3）mc; a = 818.43（5），c = 1336.54（8）pm，Z = 4），类似的[ErF8]（5-）多面体（d（Er3 + -F-）= 219-237 pm）最初通过顺式边缘缩合汇聚成三组[Er3F19]（10-），然后通过F-角进一步连接以形成垂直于c轴的二维网络。最后，这些层的交联又通过普通的F-顶点实现，从而形成了易于吸收Rb +阳离子的大空腔。这些系列的第二部分将报告ErF3贫乏AEr（2）F（7）型代表A = K，Rb和Cs的合成和晶体结构。

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