| Dipolar and J encoded DQ MAS spectra under rotational resonance. | |
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MedLine Citation:
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PMID: 11384179 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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A two-dimensional (2D) double-quantum (DQ) experiment under rotational resonance (R(2)) conditions is introduced for evaluating dipolar couplings in rotating solids. The contributions from the R(2)-recoupled dipolar interaction and the J coupling can be conveniently separated in the resulting 2D R(2)-DQ spectrum, so that the unknown dipolar coupling can readily be extracted, provided that the values of the involved J coupling constants are known. Since the measured parameters are integral intensity ratios between suitably chosen absorption peaks in the 2D spectrum, the proposed method is characterized by a reduced sensitivity to relaxation parameters. The effect of rotor-modulated terms, including chemical shift anisotropy, is efficiently averaged out by synchronizing the excitation/reconversion time with the rotor period. All of these features are demonstrated theoretically by the example of two model systems, namely, isolated spin-pairs and a three-spin system. The results of the theoretical models are applied to both (13)C and (1)H nuclei to extract dipolar couplings in uniformly (13)C labeled L-alanine and a crosslinked natural rubber. |
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Authors:
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C Filip; X Filip; M Bertmer; D E Demco; B Blümich |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of magnetic resonance (San Diego, Calif. : 1997) Volume: 150 ISSN: 1090-7807 ISO Abbreviation: J. Magn. Reson. Publication Date: 2001 Jun |
Date Detail:
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Created Date: 2001-05-31 Completed Date: 2001-07-26 Revised Date: 2003-10-31 |
Medline Journal Info:
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Nlm Unique ID: 9707935 Medline TA: J Magn Reson Country: United States |
Other Details:
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Languages: eng Pagination: 184-93 Citation Subset: - |
Copyright Information:
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Copyright 2001 Academic Press. |
Affiliation:
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Institute for Technical Chemistry and Macromolecular Chemistry, RWTH Aachen, Worringerweg 1, D-52074 Aachen, Germany. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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