Single-Scan Ultraselective NMR Experiments with Preserved Sensitivity

Selective NMR experiments provide rapid access to important structural information, and are essential to tackle the analysis of large molecules and complex mixtures. Single-scan ultraselective experiments are particularly useful, as they can rapidly select signals that overlap with other signals. Here, we describe a novel type of single-scan ultraselective NMR experiments that is robust against the effects of translational molecular diffusion, and thus make it possible to improve significantly the sensitivity of the experiment. This will largely broaden the applicability of this powerful class of experiments. Single-scan ultraselective experiments, based on the GEMSTONE (gradient-enhanced multiplet-selective targeted-observation NMR experiment) element, are a powerful approach to extract detailed information from complex NMR spectra. We describe an approach allowing to dramatically reduce signal losses due to translational diffusion, for applications to structure elucidation and mixture analysis.image