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首页> 外文期刊>Acta crystallographica. Section C, Structural chemistry. >An investigation of polyhedral deformation in two mixed-metal diarsenates: SrZnAs2O7 and BaCuAs2O7
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An investigation of polyhedral deformation in two mixed-metal diarsenates: SrZnAs2O7 and BaCuAs2O7

机译：SrZnAs2O7和BaCuAs2O7两种混合金属砷化物的多面体变形研究

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摘要

Two isostructural diarsenates, SrZnAs2O7 (strontium zinc diarsenate), (I), and BaCuAs2O7 [barium copper(II) diarsenate], (II), have been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction. The three-dimensional open-framework crystal structure consists of corner-sharing M2O5 (M2 = Zn or Cu) square pyramids and diarsenate (As2O7) groups. Each As2O7 group shares its five corners with five different M2O5 square pyramids. The resulting framework delimits two types of tunnels aligned parallel to the [010] and [100] directions where the large divalent nine-coordinated M1 (M1 = Sr or Ba) cations are located. The geometrical characteristics of the M1O9, M2O5 and As2O7 groups of known isostructural diarsenates, adopting the general formula M1IIM2IIAs2O7 (M1II = Sr, Ba, Pb; M2II = Mg, Co, Cu, Zn) and crystallizing in the space group P21, are presented and discussed.
机译：在水热条件下合成了两种同构的二砷酸盐，即SrZnAs2O7（二砷酸锶锌）和（IbBaBaAs2O7）[BaarAs2O7]（二砷化钡铜（II）），并通过单晶X射线衍射对其进行了表征。三维开放框架晶体结构由角共享M2O5（M2 = Zn或Cu）方形金字塔和二砷酸盐（As2O7）组组成。每个As2O7组与五个不同的M2O5方锥共享五个角。最终的框架界定了平行于[010]和[100]方向排列的两种类型的隧道，大型二价9位配位的M1（M1 = Sr或Ba）阳离子位于其中。已知同构二砷酸盐的M1O9，M2O5和As2O7基团的几何特征，采用通式M1IIM2IIAs2O7（M1II = Sr，Ba，Pb; M2II = Mg，Co，Cu，Zn）并在空间群P21 / n中结晶，介绍和讨论。

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