High-Resolution J-scaling Nuclear Magnetic Resonance Spectra in Inhomogeneous Fields via Intermolecular Multiple-Quantum Coherences

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Abstract:

High-resolution nuclear magnetic resonance (NMR) spectroscopy with information on chemical shifts and J-coupling constants is a sensitive tool for studying physical, chemical, and biological properties of materials at the molecular level. In this paper, a pulse sequence is developed for acquiring high-resolution NMR spectra of liquid samples with J-scaling in inhomogeneous fields via two-dimensional intermolecular multiple-quantum coherence acquisitions. In the resulting one-dimensional projection spectra, apparent J-coupling constants were obtained with a scaling factor theoretically varying from zero (completely decoupled) to infinity relative to the original J-coupling constants while retaining information on chemical shifts, relative peak areas, and multiplet patterns. This allows either an accurate measurement of small J-coupling constants of weakly coupled spin systems or less crowded spectra for spin systems with J-splitting. Experimental observations and simulation results agree with theoretical analysis.

Keywords: HIGH RESOLUTION; INHOMOGENEOUS FIELD; INTERMOLECULAR MULTIPLE-QUANTUM COHERENCES; J-SCALING; NMR; NUCLEAR MAGNETIC RESONANCE

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370209788347020

Affiliations: 1: Department of Physics, State Key Laboratory of Physical Chemistry of Solid Surface, and Fujian Key Laboratory of Plasma and Magnetic Resonance, Xiamen University, Xiamen 361005, PR China; Department of Imaging Sciences, University of Rochester, Rochester, New York 2: Department of Physics, State Key Laboratory of Physical Chemistry of Solid Surface, and Fujian Key Laboratory of Plasma and Magnetic Resonance, Xiamen University, Xiamen 361005, PR China 3: Department of Imaging Sciences, University of Rochester, Rochester, New York

Publication date: May 1, 2009

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