Chemical Physics Letters, Vol.616, 226-231, 2014
High-resolution H-1 NMR spectra from inhomogeneous fields based on intermolecular multiple-quantum coherences between proton and quadrupolar nuclei
Based on intermolecular double- and single-quantum coherences between H-1 and quadrupolar nuclei, two new pulse sequences with time efficient acquisitions are proposed for high-resolution H-1 NMR spectra in inhomogeneous fields. Theoretical expressions for the signal were derived according to the product operator formalism. The proposed methods are applicable to both isolated and J-coupled spin systems, with J-coupling constant rescaling. Experiments on test solutions are performed under non-ideal field conditions to show the applicability of the proposed method. These two sequences are complementary to each other and provide alternative approaches for obtaining high-resolution information in relatively large inhomogeneous fields. (C) 2014 Elsevier B.V. All rights reserved.