Chemical shift correlations from hyperpolarized NMR by off-resonance decoupling.
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abstract
Nuclear magnetic resonance, through observation of chemical shift, allows the separate identification of each atom in a molecule. Thus, NMR spectra impart an often unrivaled wealth of information on molecular structure. A particular advantage of NMR spectroscopy is the ability to record multidimensional spectra, which provide correlations between atoms. When compared to other techniques, such as optical spectroscopy, the acquisition of NMR spectra is however an insensitive process, requiring samples of high concentration and long acquisition times. Recently, it has been demonstrated that dynamic nuclear polarization, a hyperpolarization technique, can increase the NMR signal by several orders of magnitude. Here, we present a robust method that allows recording two-dimensional chemical shift correlations from such hyperpolarized molecules. The method makes use of an apparent scaling of the scalar coupling observed on one type of atom, when an off-resonance decoupling field is applied to another type of atom. Thus, two-dimensional chemical shift correlations can be read directly from a small number of scans acquired using a hyperpolarized sample. Due to the ease of implementing this technique on commercial hyperpolarization and NMR equipment, it appears ideally suited for routine application, for example, to obtain carbon-proton chemical shift correlations in organic molecules.
