A combined 17O RAPT and MQ-MAS NMR study of L-leucine |
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| Authors: | Prasad Subramanian Clark Ted M Sharma Ramesh Kwak Hyung-Tae Grandinetti Philip J Zimmermann Herbert |
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| Institution: | Department of Chemistry, The Ohio State University, 120 W. 18th Avenue, Columbus, OH 43210-1173, USA. |
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| Abstract: | We report the application of rotor-assisted population transfer (RAPT) to measure the quadrupolar coupling constant (C(q)) for spin 5/2 nuclei. Results from numerical simulations are presented on the magnitude of enhancement factor as a function of frequency offsets, i.e. the RAPT profile. Experimental O17 RAPT profile is traced for the amino acid L-leucine. In addition, results from MQ-MAS experiments are incorporated to determine the quadrupolar asymmetry parameter (eta(q)). Unlike previous reports, the O17 NMR parameters for an amino acid, L-leucine, is reported at a relatively low field of 9.4 T. |
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