Synthesis and Characterization of the Ultramarine-Type Analog Na8−x[Si6Al6O24]·(S2,S3,CO3)1−2<

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• 作者：Esteban Climent-Pascual ; Julio Romero de Paz ; Juan Rodrguez-Carvajal ; Emmanuelle Suard ; Regino Sez-Puche
• 刊名：Inorganic Chemistry
• 出版年：2009
• 出版时间：July 20, 2009
• 年：2009
• 卷：48
• 期：14
• 页码：6526-6533
• 全文大小：841K
• 年卷期：v.48,no.14(July 20, 2009)
• ISSN：1520-510X

文摘

The use of nitrite sodalite as a precursor to prepare new blue ultramarine analogs has been investigated. The encapsulation of the chromophores inside of β cages was achieved by heating the nitrite sodalite precursor with a mixture of sodium carbonate, sulfur, and a reducing agent at about 1000 K under airtight conditions. The obtained new blue ultramarine-type material was characterized by means of X-ray and neutron powder diffraction, transmission electron microscopy, ²⁹Si magic-angle-spinning NMR, IR, Raman, and diffuse reflectance spectroscopies. Thermogravimetric analysis and magnetic measurements were performed in order to determine water and chromophore contents, respectively. On the basis of the spectroscopic results and Rietveld analysis of neutron powder data, the β cage filling was found to be yellow S₂⁻ and blue S₃⁻ chromophores along with carbonate anions. The determined chromophore concentration, about 0.31 mol per formula unit, is enough to have greenish-blue ultramarines, which proves that ultramarine analogs can be obtained from nitrite sodalite.