Flux Synthesis of Salt-Inclusion Uranyl Silicates: [K3Cs4F][(UO2)(3)(Si2O7)(2)] and [NaRb6F][(UO2)(3)(Si2O7)(2)]

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/28087

Title:	Flux Synthesis of Salt-Inclusion Uranyl Silicates: [K3Cs4F][(UO2)(3)(Si2O7)(2)] and [NaRb6F][(UO2)(3)(Si2O7)(2)]
Authors:	Lee,CS;Wang,SL;Chen,YH;Lii,KH
Contributors:	光電科學研究所
Keywords:	STATE NMR-SPECTROSCOPY;BOND-VALENCE PARAMETERS;CRYSTAL-STRUCTURES;HYDROTHERMAL SYNTHESIS;URANIUM SILICATE;HIGH-TEMPERATURE;HOST LATTICES;FRAMEWORK;RB;CS
Date:	2009
Issue Date:	2010-06-29 19:41:30 (UTC+8)
Publisher:	中央大學
Abstract:	Two salt-inclusion uranyl silicates, [K3Cs4F][(UO2)(3)(Si2O7)(2)] (compound 1) and [NaRb6F][(UO2)(3)(Si2O7)(2)] (compound 2), have been synthesized at high temperature using mixtures of alkali metal fluorides as fluxes and structurally characterized by single-crystal X-ray diffraction. Both compounds contain UO6 tetragonal bipyramids linked by disilicate groups to form three-dimensional framework structures with identical framework composition but different framework structures and salt inclusions. Both structures contain elliptical 12-ring channels where the K2Cs4F and Rb6F units are located. They are the first examples of salt-inclusion uranium silicates. The frameworks of 1 and 2 are thermally stable up to 850 and 750 degrees C, as indicated from powder X-ray diffraction. The F-19 and Si-29 MAS NMR spectra and the second-harmonic-generation response of 1 are consistent with the crystal structure analysis results. Crystal data: [K3Cs4F][(UO2)(3)(Si2O7)(2)], Cmc2(1), a = 7.8095(3) angstrom, b = 22.2819(7) angstrom, c = 14.0861(4) angstrom, and Z = 4; [NaRb6F][(UO2)(3)(Si2O7)(2)], Pnnm, a = 11.1429(2) angstrom, b = 13.5151(3) angstrom, c = 7.8868(1) angstrom, and Z = 2.
Relation:	INORGANIC CHEMISTRY
Appears in Collections:	[Graduate Institute of Optics and Photonics] journal & Dissertation

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