Fast Characterization of Functionalized Silica Materials by Silicon-29 Surface-Enhanced NMR Spectroscopy Using Dynamic Nuclear Polarization

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• 作者：Moreno Lelli ; David Gajan ; Anne Lesage ; Marc A. Caporini ; Veronika Vitzthum ; Pascal Mi茅ville ; Florent H茅roguel ; Fernando Rasc贸n ; Arthur Roussey ; Chlo茅 Thieuleux ; Malika Boualleg ; Laurent Veyre ; Geoffrey Bodenhausen ; Christophe Coperet ; Lyndon Emsley
• 刊名：Journal of the American Chemical Society
• 出版年：2011
• 出版时间：February 23, 2011
• 年：2011
• 卷：133
• 期：7
• 页码：2104-2107
• 全文大小：778K
• 年卷期：v.133,no.7(February 23, 2011)
• ISSN：1520-5126

文摘

We demonstrate fast characterization of the distribution of surface bonding modes and interactions in a series of functionalized materials via surface-enhanced nuclear magnetic resonance spectroscopy using dynamic nuclear polarization (DNP). Surface-enhanced silicon-29 DNP NMR spectra were obtained by using incipient wetness impregnation of the sample with a solution containing a polarizing radical (TOTAPOL). We identify and compare the bonding topology of functional groups in materials obtained via a sol鈭抔el process and in materials prepared by post-grafting reactions. Furthermore, the remarkable gain in time provided by surface-enhanced silicon-29 DNP NMR spectroscopy (typically on the order of a factor 400) allows the facile acquisition of two-dimensional correlation spectra.