Accurate Structural Description of the Two Nanoporous Fluorinated Aluminophosphates ULM-3(Al) and ULM-4(Al) by Solid-State NMR

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• 作者：Charlotte Martineau ; Boris Bouchevreau ; Ren茅e Siegel ; J眉rgen Senker ; Alenka Risti膰 ; Francis Taulelle
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：October 11, 2012
• 年：2012
• 卷：116
• 期：40
• 页码：21489-21498
• 全文大小：630K
• 年卷期：v.116,no.40(October 11, 2012)
• ISSN：1932-7455

文摘

This work reports an investigation of the localization of F atoms and OH groups in the two fluorinated aluminophosphates ULM-3(Al) and ULM-4(Al) by multinuclear and multidimensional high-resolution solid-state magic-angle spinning nuclear magnetic resonance (NMR) spectroscopy. First, in ULM-3(Al), we show that the compound is fully fluorinated. A whole set of state-of-the-art homonuclear and heteronuclear 2D NMR experiments (¹⁹F鈥?sup>31P, ¹⁹F鈥?sup>19F, ³¹P鈥?sup>31P, ²⁷Al鈥?sup>31P, and ¹H鈥?sup>31P) have been recorded, yielding a unique line assignment of all the ³¹P and ¹⁹F resonances to the corresponding crystallographic sites. In a second part, ULM-4(Al) is shown to be a quite remarkable sample because it contains both fully and partially fluorinated building units. The structural differences between ULM-3(Al) and ULM-4(Al) are finally discussed in the light of the results in terms of potential templating role of water.