Synthesis and Structural Characterization of a New Nanoporous-like Keggin Heteropolyanion Salt: K3(H2O)4[H2SiVW11O40](H2O)<
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- 作者：Rodrigo de Paiva Floro Bonfim ; Luiza Cristina de Moura ; Hé ; lè ; ne Pizzala ; Stefano Caldarelli ; Sé ; bastien Paul ; Jean Guillaume Eon ; Olivier Mentré ; Mickaë ; l Capron ; Laurent
- 刊名：Inorganic Chemistry
- 出版年：2007
- 出版时间：September 3, 2007
- 年：2007
- 卷：46
- 期：18
- 页码：7371 - 7377
- 全文大小：366K
- 年卷期：v.46,no.18(September 3, 2007)
- ISSN：1520-510X
文摘
Single crystals of the potassium salt K3(H2O)4[H2SiVW11O40](H2O)8+x of the vanadium monosubstituted 
-Keggindodecatunsgstosilicate were grown from an aqueous solution and analyzed by EDS, XRD, vibration and electronicspectroscopy, and 1H, 51V, and 29Si solid-state NMR spectroscopy. Results indicate the formation of a nanoporous-like compound of hexagonal symmetry (space group P62) with large, water-filled channels running along the c axis.A uniform distribution of vanadium over the 12 metal sites of the -Keggin anion is observed by XRD. Two differentneighborhoods were characterized by 51V NMR in a 2:1 ratio (
iso = -546.3 and -536.2 ppm), in accordance witha difference in the number of potassium ions in the second coordination shell of vanadium.
-Keggindodecatunsgstosilicate were grown from an aqueous solution and analyzed by EDS, XRD, vibration and electronicspectroscopy, and 1H, 51V, and 29Si solid-state NMR spectroscopy. Results indicate the formation of a nanoporous-like compound of hexagonal symmetry (space group P62) with large, water-filled channels running along the c axis.A uniform distribution of vanadium over the 12 metal sites of the -Keggin anion is observed by XRD. Two differentneighborhoods were characterized by 51V NMR in a 2:1 ratio (iso = -546.3 and -536.2 ppm), in accordance witha difference in the number of potassium ions in the second coordination shell of vanadium.