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Demixing of severely overlapped H-1 NMR resonances and interpretation of anomalous intensity pattern of dipolar coupled A(3) spins in a weakly aligning medium

Nath, Nilamoni and Suryaprakash, N (2010) Demixing of severely overlapped H-1 NMR resonances and interpretation of anomalous intensity pattern of dipolar coupled A(3) spins in a weakly aligning medium. In: Journal of Magnetic Resonance, 207 (2). pp. 190-196.

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Official URL: http://dx.doi.org/10.1016/j.jmr.2010.08.021

Abstract

We report a single C-13 spin edited selective proton-proton correlation experiment to decipher overcrowded 13C coupled proton NMR spectra of weakly dipolar coupled spin systems. The experiment unravels the masked C-13 satellites in proton spectrum and permits the measurement of one bond carbon-proton residual dipolar couplings in I3S and for each diastereotopic proton in I2S groups. It also provides all the possible homonuclear proton-proton residual couplings which are otherwise difficult to extract from the broad and featureless one dimensional H-1 spectrum, in addition to enantiodifferentiation in a chiral molecule. Employment of heteronuclear (C-13) decoupling in the evolution period results in complete demixing of overlapped signals from enantiomers. The observed anomalous intensity pattern in strongly dipolar coupled methyl protons in methyl selective correlation experiment has been interpreted using polarization operator formalism. (C) 2010 Elsevier Inc. All rights reserved.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Selective excitation; Dipolar couplings; Weakly orienting media; Hetero-decoupling; Chiral discrimination; PBLG
Department/Centre: Division of Chemical Sciences > NMR Research Centre (Formerly SIF)
Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 12 Jan 2011 10:34
Last Modified: 12 Jan 2011 10:34
URI: http://eprints.iisc.ernet.in/id/eprint/34904

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