Weil Matthias
Institute for Chemical Technologies and Analytics, Division of Structural Chemistry, Vienna University of Technology, Getreidemarkt 9/164-SC, A-1060 Vienna, Austria.
Acta Crystallogr Sect E Struct Rep Online. 2009 Oct 10;65(Pt 11):i75. doi: 10.1107/S1600536809040355.
The crystal structure of the title compound, sodium strontium orthoarsenate(V) nona-hydrate, is isotypic with NaSr(PO(4))(H(2)O)(9) and the minerals nabaphite [NaBa(PO(4))(H(2)O)(9)] and nastrophite [Na(Sr,Ba)(PO(4))(H(2)O)(9)]. The Na and Sr atoms are located on threefold rotation axes and are in the centres of slightly distorted Na(H(2)O)(6) octa-hedra and Sr(H(2)O)(9) tricapped trigonal prisms, respectively. A framework structure is established via edge-sharing of these polyhedra. Disordered AsO(4) tetra-hedra (with threefold symmetry) are situated in the inter-stitial space of the framework. Although reasonable H-atom positions of the water mol-ecules were not established, close O⋯O contacts between the disordered AsO(4) tetra-hedra and the water mol-ecules suggest strong O-H⋯O hydrogen bonding.
标题化合物正砷酸锶钠九水合物的晶体结构与NaSr(PO₄)(H₂O)₉以及矿物钠钡磷石[NaBa(PO₄)(H₂O)₉]和钠锶磷石[Na(Sr,Ba)(PO₄)(H₂O)₉]同型。钠原子和锶原子位于三重旋转轴上，分别处于略微扭曲的Na(H₂O)₆八面体和Sr(H₂O)₉三帽三棱柱的中心。通过这些多面体的边共享建立了框架结构。无序的AsO₄四面体（具有三重对称性）位于框架的间隙空间中。尽管未确定水分子合理的氢原子位置，但无序的AsO₄四面体与水分子之间紧密的O⋯O接触表明存在强O - H⋯O氢键。
