Rb₃In(H₂O)Si₅O₁₃:  A Novel Indium Silicate with a CdSO₄-Topological-Type Structure

Abstract

A novel indium silicate, Rb3In(H2O)Si5O13, has been synthesized using a high-temperature, high-pressure hydrothermal method and characterized by single-crystal X-ray diffraction. The structure consists of five-membered rings of corner-sharing SiO4 tetrahedra connected via corner sharing to four adjacent five-membered rings to form a 3D silicate framework that belongs to the CdSO4 topological type. The InO6 octahedron shares five of its corners with five different SiO4 tetrahedra to form a 3D frame-work that delimits two types of channels to accommodate the rubidium cations. The sixth corner of InO6 is coordinated H2O. The structure is related to that of the titanium silicate ETS-10, and these are the only two metal silicates that have the CdSO4-topological-type structure. In addition, the crystal of Rb3In(H2O)Si5O13 shows an intense second harmonic generation signal. Crystal data: H2Rb3InSi5O14, monoclinic, space group Cc (No. 9), a = 9.0697(5) A, b = 11.5456(6) A, c = 13.9266(8) A, beta = 102.300(1) degrees, V = 1424.8(1) A3, and Z = 4.

High-Temperature, High-Pressure Hydrothermal Synthesis, Crystal Structure, and Luminescence Properties of Cs3EuSi6O15, a New Europium(III) Silicate with a Three-Dimensional Framework Structure

“…Recently, much work has focused on the synthesis of microporous silicate framework solids containing metals in different coordination geometries . A large number of hydrothermally synthesized silicates of transition metals, − main group elements, − uranium, − and lanthanide elements − have been reported. They have shown a rich structural chemistry and interesting physical and chemical properties.…”

“…Most of these silicates were synthesized with alkali metal cations in a Teflon-lined autoclave under mild hydrothermal conditions at 180−240 °C. A niobium and a uranium silicate have also been synthesized by using organic ammonium cations as structure-directing agents. , We have also synthesized a number of new silicates of transition metals, indium, , and uranium 16-18 by high-temperature, high-pressure hydrothermal reactions at 500−600 °C in gold ampules. Compounds that were synthesized under high- T /high- P hydrothermal conditions generally have more compact structures as compared to those from mild hydrothermal reactions.…”

A novel second-order non-linear optical coordination polymer with three-fold interpenetrated CdSO4-type network constructed by carboxylate–sulfonate ligands and strontium ions

“…A 1064 nm radiation generated by a Q-switched Nd: YAG solid-state laser was used as the fundamental frequency light. The crystal samples were ground and sieved into several distinct particle sizes (30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(40) μm, 46-62 μm, 63-84 μm, 135-165 μm, 191-228 μm, 235-277 μm). The samples with distinct particle sizes were packed in round glass boxes and then they were exposed to laser radiation.…”

Novel open-framework europium silicates prepared under high-temperature and high-pressure conditions

“…Recently, many studies have focused on the synthesis of microporous silicates of transition metals, [1][2][3][4][5][6][7][8][9] main group elements, [10][11][12][13] lanthanides, [14][15][16][17][18][19][20] and uranium [21][22][23][24] because of their versatile structural chemistry as well as interesting physical and chemical properties. Among them, lanthanide silicates, which contain stoichiometric amounts of framework Ln 3+ ions, have high thermal stability and tunable optical properties, making them potential candidates as fast ion conductors and optical materials.…”