...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >New Boron-Centered Mixed-Halide Zirconium Cluster Phases with a Cubic Structure: NaZr_6Cl_(12-x)I_(2+x)B (x <= 6) and A_(0.5)~(II)Zr_6(Cl,I)_(14)B(A~(II)) = Ca, Sr, Ba)
【24h】

New Boron-Centered Mixed-Halide Zirconium Cluster Phases with a Cubic Structure: NaZr_6Cl_(12-x)I_(2+x)B (x <= 6) and A_(0.5)~(II)Zr_6(Cl,I)_(14)B(A~(II)) = Ca, Sr, Ba)

机译：具有立方结构的新的以硼为中心的混合卤化物锆簇相：NaZr_6Cl_（12-x）I_（2 + x）B（x <= 6）和A_（0.5）〜（II）Zr_6（Cl，I）_ （14）B（A〜（II））= Ca，Sr，Ba）

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The boron-centered mixed-halide zirconium cluster phases were obtained from reactions of appropriate amounts of NaCl or ACl_2 (with A = Ca, Sr, Ba), ZrCl_4, ZrI_4, Zr (powder), and elemental B in sealed tantalum containers at 800 -850 deg C. Single crystals of NaZr_6Cl_(10.94(1))I_(3.06)B and Sr_(0.5)Zr_6Cl_(11.34)(2)I_(2.66)B have been characterized by X-ray diffraction at room temperature (cubic, Pa3, Z = 4, a = 1331.3(1)) pm, and a = 1326.2(2) pm, respectively). The Zr_6 octahedra in these phases are centered by boron and three-dimensionally connected by exo-iodide atoms which bridge simultaneously three octahedra. Six out of the twelve inner chlorides (one symmetry independent site) which bridge the edges of each octahedron, but are not involved in inter-cluster bridging (according to AZr_6I_(6/2)~(a-a-a) (Cl_(12-x)I_x)~iB), can be completely substituted by iodide. Such a substitution is not possible for the remaining six inner halides on the second symmetry independent site, because the larger iodide atom on this site would experience strong repulsive forces from short anionic contacts. This gives the phase width of NaZr_6Cl_(12-x)I_(2+x)B to x <= 6. The size of the voids that cover the cations A limits this structure to members with A = Na, Ca, Sr, and Ba. This structure type requires the existence of two differently sized halide types simultaneously.
机译：在800密闭的钽容器中，从适量的NaCl或ACl_2（A = Ca，Sr，Ba），ZrCl_4，ZrI_4，Zr（粉末）和元素B的反应中，获得了以硼为中心的混合卤化物锆簇相。 -850摄氏度.NaZr_6Cl_（10.94（1））I_（3.06）B和Sr_（0.5）Zr_6Cl_（11.34）（2）I_（2.66）B的单晶已通过室温下的X射线衍射进行了表征（立方） ，Pa3，Z = 4，a = 1331.3（1）pm和a = 1326.2（2）pm）。这些相中的Zr_6八面体以硼为中心，并由同时桥接三个八面体的外碘化物原子三维连接。桥接每个八面体的边缘的十二个内部氯化物中的六个（一个对称的独立位点），但不参与集群间桥接（根据AZr_6I_（6/2）〜（aaa）（Cl_（12-x） I_x）〜iB），可以完全被碘化物取代。对于第二个非对称对称位点上的其余六个内部卤化物而言，这样的取代是不可能的，因为该位点上的较大碘原子会受到短阴离子接触的强烈排斥力。这使NaZr_6Cl_（12-x）I_（2 + x）B的相宽为x <=6。覆盖阳离子A的空隙的大小将这种结构限制为A = Na，Ca，Sr和爸这种结构类型要求同时存在两种不同尺寸的卤化物类型。

著录项

相似文献

  • 外文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号