Polarization inversion applied to proton MAS-NMR spectroscopy - Methylene and methine free proton NMR spectra

Potnuru, Lokeswara Rao and Ramanathan, KV (2018) Polarization inversion applied to proton MAS-NMR spectroscopy - Methylene and methine free proton NMR spectra. In: JOURNAL OF MAGNETIC RESONANCE, 296 . pp. 181-187.

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Abstract

Polarization-inversion (PI) has been applied to proton magic angle spinning (MAS) NMR spectra recorded under fast MAS conditions. The combination of cross-polarization (CP) from carbon to proton and subsequent polarization-inversion produces strong oscillatory behavior in the proton signal intensities at high MAS speeds of 60 kHz. It is observed that by a suitable choice of the polarization-inversion time, a proton spectrum free of methylene and methine protons can be obtained. Such a spectrum, on the one hand, increases the resolution of the crowded proton spectrum and on the other hand provides exclusively chemical shifts of protons such as NH, OH and SH which might otherwise overlap with carbon attached protons. The oscillations observed during PI can also be used to estimate the dipolar coupling between proton and carbon by Fourier transformation of data acquired at equally incremented time periods. The utility of the above ideas has been demonstrated on a set of molecules with both C-13 labeled and C-13 in natural abundance. (C) 2018 Elsevier Inc. All rights reserved.

Item Type:	Journal Article
Publication:	JOURNAL OF MAGNETIC RESONANCE
Publisher:	ACADEMIC PRESS INC ELSEVIER SCIENCE
Additional Information:	Copyright of this article belongs to ACADEMIC PRESS INC ELSEVIER SCIENCE
Keywords:	Solid-state NMR; Proton MAS NMR; Cross-polarization; Polarization inversion; Spectral editing; CPPI
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	24 Jan 2019 08:55
Last Modified:	24 Jan 2019 08:55
URI:	http://eprints.iisc.ac.in/id/eprint/61395

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