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An Intermolecular Single-Quantum Coherence Detection Scheme for High-Resolution Two-Dimensional J-resolved Spectroscopy in Inhomogeneous Fields

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Abstract:

A new pulse sequence based on intermolecular single-quantum coherences (iSQCs) is proposed to achieve high-resolution two-dimensional (2D) J-resolved spectra in inhomogeneous fields via three-dimensional (3D) acquisition. Since the iSQC evolution period and spin echo evolution period in this sequence are intrinsically insensitive to magnetic field inhomogeneities, high-resolution 2D J-resolved spectra can be recovered from nuclei in inhomogeneous fields by projecting the 3D data onto the 2D plane. Analytical expressions of the resulting signals were derived assuming the secular dipole–dipole interaction. Analyses of a solution sample placed in a deliberately unshimmed magnetic field and of a biological sample with intrinsic field inhomogeneities were performed. The results show that this sequence provides an attractive and efficient way to eliminate the influence of field inhomogeneities on 2D J-resolved spectra, which is potentially useful for characterizing complex chemical materials and studying biological metabolites in inhomogeneous fields.

Keywords: HIGH RESOLUTION; INHOMOGENEOUS FIELDS; INTERMOLECULAR SINGLE-QUANTUM COHERENCES; J-RESOLVED SPECTROSCOPY; NMR; NUCLEAR MAGNETIC RESONANCE

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370210790619645

Affiliations: 1: Department of Physics, Fujian Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, PR China 2: Department of Physics, Fujian Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, PR China;, Email: chenz@xmu.edu.cn

Publication date: February 1, 2010

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