| Abstract: A cesium indium hydrated phosphate, CsIn[PO3(OH)]2, was synthesized under mild hydrothermal conditions, and the crystal structures were characterized by single crystal X-ray diffraction method. CsIn[PO3(OH)]2 has a new type of crystal structure. Crystallographic data are as following: Mr=439.69, monoclinic, mP56, P1 21/c 1 (No.14) , a=0.532 86(6) nm, b=0.916 53(7) nm, c=1.478 39(14) nm, β=93.849(9)°, V=0.720 4(1) nm3, Z=4, Dx=4.054 g·cm-3, μ=8.713mm-1, F(000)=800, R1=0.032 5, wR2=0.087 4 for 116 variables and 1 502 contributing unique reflections. The structure is characterized by 6-membered column with cross-section formed by two InO6 octahedra and four PO4 tetrahedra. The condensation of the column forms an almost hexagonal close-packing array along a axis, resulting in close packing of 12-membered-ring channels occupied by Cs+ cations. The connections of the columns and channels result in a three-dimensional network structure. The formation of the 12-membered ring in these structures seems clearly governed by the cation size by comparing to Na2In2[PO3(OH)]4·H2O with the similar stoichiometry. The topological construction of the title structure can be considered as an augmented 6,3-net. RbIn[PO3(OH)]2 is isotypic to the Cs compound. CSD: 391266. |
