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Characterization of Nanostructured Organic-Inorganic Hybrid Materials Using Advanced Solid-State NMR Spectroscopy

Published online by Cambridge University Press:  31 January 2011

Kanmi Mao ,
Jennifer L. Rapp ,
Jerzy W. Wiench  and
Marek Pruski
Kanmi Mao
Affiliation:
kanmimao@iastate.edu, Ames Laboratory, Ames, Iowa, United States
Jennifer L. Rapp
Affiliation:
jlr48@iastate.edu, Ames Laboratory, Ames, Iowa, United States
Jerzy W. Wiench
Affiliation:
jwiench@iastate.edu, Ames Laboratory, Ames, Iowa, United States
Marek Pruski
Affiliation:
mpruski@iastate.edu, Ames Laboratory, 230 SPEDDING, Ames, 50011-3020, United States, 515-294-2017
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Abstract

We demonstrate the applications of several novel techniques in solid-state nuclear magnetic resonance spectroscopy (SSNMR) to the structural studies of mesoporous organic-inorganic hybrid catalytic materials. Most of these latest capabilities of solid-state NMR were made possible by combining fast magic angle spinning (at ≥ 40 kHz) with new multiple RF pulse sequences. Remarkable gains in sensitivity have been achieved in heteronuclear correlation (HETCOR) spectroscopy through the detection of high-λ (1H) rather than low-λ (e.g., 13C, 15N) nuclei. This so-called indirect detection technique can yield through-space 2D 13C-1H HETCOR spectra of surface species under natural abundance within minutes, a result that earlier has been out of reach. The 15N-1H correlation spectra of species bound to a surface can now be acquired, also without isotope enrichment. The first indirectly detected through-bond 2D 13C-1H spectra of solid samples are shown, as well. In the case of 1D and 2D 29Si NMR, the possibility of generating multiple Carr-Purcell-Meiboom-Gill (CPMG) echoes during data acquisition offered time savings by a factor of ten to one hundred. Examples of the studied materials involve mesoporous silica and mixed oxide nanoparticles functionalized with various types of organic groups, where solid-state NMR provides the definitive characterization.

Keywords

nuclear magnetic resonance (NMR)nanostructurestructural
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1184: Symposium GG – Electron Crystallography for Materials Research and Quantitive Characterization of Nanostructured Materials , 2009 , 1184-HH07-01
Copyright
Copyright © Materials Research Society 2009

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