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Solid‐state NMR spectra of paramagnetic silica‐based materials: observation of 29 Si and 27 Al nuclei in the first coordination spheres of manganese ions
Author(s) -
Bakhmutov Vladimir I.,
Shpeizer Boris G.,
Clearfield Abraham
Publication year - 2006
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1866
Subject(s) - chemistry , paramagnetism , nmr spectra database , ion , manganese , spectral line , solid state nuclear magnetic resonance , carbon 13 nmr satellite , nuclear magnetic resonance , nuclear magnetic resonance spectroscopy , anisotropy , analytical chemistry (journal) , crystallography , fluorine 19 nmr , stereochemistry , physics , condensed matter physics , organic chemistry , quantum mechanics , astronomy
Some silica‐based solids, prepared by the sol/gel method in the presence of high Mn 2+ concentrations, have been characterized by the 29 Si, 27 Al MAS NMR spectra and 29 Si T 1 measurements. The single‐pulse 29 Si and 27 Al MAS NMR spectra have shown broad spinning sideband patterns that are interpreted in terms of anisotropic bulky magnetic susceptibility (BMS) and dipole‐field effects. In the absence of paramagnetic isotropic shifts, the 29 Si and 27 Al nuclei observed in the single‐pulse NMR spectra have been assigned to nuclei remote from paramagnetic centers. It has been demonstrated that the 29 Si and 27 Al nuclei, which are in the vicinity of the manganese ions, can be detected by the Hahn‐echo MAS NMR experiments at different carrier frequencies. Copyright © 2006 John Wiley & Sons, Ltd.