New Indium(Iii) Phosphate Csin[Po3(Oh)](2) With A New Type Of Structure

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: M-r=439.69, monoclinic, mP56, P1 2(1)/c 1 (No.14), a=0.532 86(6) nm, b=0.916 53(7) nm, c=1.478 39(14) nm, beta=93.849(9)degrees, V=0.720 4(1) nm(3), Z=4, D-x=4.054 g.cm(-3), mu=8.713 mm(-1), F(000)=800, R-1=0.0325, wR(2)=0.087 4 for 116 variables and 1502 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. Rbln [PO3(OH)](2) is isotypic to the Cs compound.