Selective saturation as an aid for carbon-13 CP/MAS n.m.r. analysis of coals at high frequencies |
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| Affiliation: | 1. University of Warsaw, Center of New Technologies (CeNT), Warsaw, Poland;2. Department of Bioinformatics and Computational Biology, Poznan University of Medical Sciences, Poznan, Poland;3. Department of Physical Pharmacy and Pharmacokinetics, Faculty of Pharmacy, Poznan University of Medical Sciences, Poznan, Poland;1. Laboratory of Epidemiology and Veterinary Microbiology, LR20IPT03, Institute Pasteur de Tunis, University Tunis El Manar, 13, Place Pasteur-BP74 Belvédère 1002, Tunis, Tunisia;2. Laboratory of Pathologic Anatomy, The National School of Veterinary Medicine, École Nationale de Médecine Vétérinaire de Sidi Thabet, University of Manouba, Sidi Thabet, Tunisia |
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| Abstract: | A selective saturation experiment is described and applied to selective elimination of 13C high resolution solid state n.m.r. signals and of their spinning sidebands, as well for sharp lines as for broad bands. A proper adjustment of experimental conditions permits selective saturation of the aromatic carbon signals of coal samples and eliminates unwanted overlapping of aromatic sidebands with the aliphatic region of the spectrum at high working frequencies. The described procedure seems to be especially useful for qualitative and quantitative high frequency n.m.r. investigations of coals having a distribution of short T2 relaxation times. |
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