Contents:
Structural phase transitions of the host framework and the dynamics of the guest species are studied by variable temperature NMR. One of the most important characteristics of molecular sieve systems is the size and shape selectivity they display towards organic molecules.
In this lecture we will outline the development of a protocol to use one and two dimensional NMR experiments to determine these structures which should be of general applicability. The 29Si MAS NMR spectra of samples that contain the siloxane SiSi linkage reflect the wide range of materials that are substantially held together by siloxane-based networks. For derivatized silicas and functionalized polysiloxanes, 13C and 1H NMR, and when appropriate 15N or 31P NMR, are useful for establishing or confirming the structures of pendant functionalized moieties.
Techniques that enable the observation of such patterns will be described and illustrated with spectra of inorganic nitrates and nitrides.
Several new techniques depend upon the concept of a Reorientation-Induced Redistribution of Isochromats. In the first of these, when the sample is slowly turned about an axis perpendicular to the external magnetic field significant gains in detection sensitivity can be achieved.
In the second, very large anisotropic interactions that inhomogeneously broaden NMR spectra, such as the 14N nuclear quadrupole coupling constant, can be measured at a single frequency by observing modulations in the amplitude of a spin-echo under slow turning conditions. Finally, results for hexamethylenetetramine demonstrate how transition-selective 14N NMR can be used to quantitatively study slow molecular motions. The application of solid-state NMR to nitride and oxynitride ceramics and glasses is reviewed.
The relative merits of the different nuclei and the techniques available are discussed.
Examples of both these areas of application are given. Pair your accounts. Your Mendeley pairing has expired. Please reconnect. Fitzgerald 1. Publication Date Print : March 18, First Page PDF.
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New Releases. Description Techniques of solid state nuclear magnetic resonance NMR spectroscopy are constantly being extended to a more diverse range of materials, pressing into service an ever-expanding range of nuclides including some previously considered too intractable to provide usable results.
At the same time, new developments in both hardware and software are being introduced and refined. This book covers the most important of these new developments.
Canadian Journal of Chemistry. Corresponding author email: wppower uwaterloo. Thomas, A. Google Scholar. Kadish, K.
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Structure and Bonding. The Porphyrin Handbook, Vol. Phthalocyanines Properties and Applications, Vol. Kentgens A P M.
MacKenzie, K. Akitt J W. Vega, A. In Encyclopedia of Nuclear Magnetic Resonance.