Abstract

High-resolution nuclear magnetic resonance (NMR) spectroscopy with information on chemical shifts and <i>J</i>-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 <i>J</i>-scaling in inhomogeneous fields via two-dimensional intermolecular multiple-quantum coherence acquisitions. In the resulting one-dimensional projection spectra, apparent <i>J</i>-coupling constants were obtained with a scaling factor theoretically varying from zero (completely decoupled) to infinity relative to the original <i>J</i>-coupling constants while retaining information on chemical shifts, relative peak areas, and multiplet patterns. This allows either an accurate measurement of small <i>J</i>-coupling constants of weakly coupled spin systems or less crowded spectra for spin systems with <i>J</i>-splitting. Experimental observations and simulation results agree with theoretical analysis.

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