Published in Annual Reports on NMR Spectroscopy
Indirect spin–spin coupling constants, or simply J-couplings, are one of the most useful and widely used NMR parameters for structure determination. Accurate analytic representation of their structural dependence is crucial for quantitative analysis. The dependence of vicinal J-coupling constants upon the dihedral angle of the coupled nuclei was fi...
Published in Annual Reports on NMR Spectroscopy
Recent developments on acidity characterization of solid acid catalysts, specifically those invoking 31P solid-state nuclear magnetic resonance (SSNMR) spectroscopy using phosphorus-containing molecules as probes, have been summarized. In particular, various 31P SSNMR approaches using trimethylphosphine, diphosphines, and trialkylphosphine oxides (...
Published in Annual Reports on NMR Spectroscopy
Published in Annual Reports on NMR Spectroscopy
Published in Annual Reports on NMR Spectroscopy
The D-HMQC (dipolar heteronuclear multiple-quantum coherence) technique is a recently developed NMR pulse sequence particularly suitable for the investigation of spatial proximity between quadrupolar and spin-1/2 nuclei. Compared to the cross-polarisation magic-angle spinning technique applied to a quadrupolar nucleus, D-HMQC does not require time-...
Published in Annual Reports on NMR Spectroscopy
Published in Annual Reports on NMR Spectroscopy
Published in Annual Reports on NMR Spectroscopy
Among the range of fast methods that were developed for speeding up NMR data acquisition, mostly over the last decade, projection spectroscopy and reduced dimensionality approaches have found significant area of applications in both solution and solid-state NMR studies. In this review, we illustrate the diversity of these applications, notably in t...
Published in Annual Reports on NMR Spectroscopy
1H NMR profiling is an emerging technique for the characterization of food quality, authenticity, origin and stability and for the study of food production, transformation and storage processes. To produce reliable results, a large number of good quality NMR spectra are needed together with suitable processing and pattern recognition algorithms. Di...
Published in Annual Reports on NMR Spectroscopy
Intermolecular zero-quantum coherences (iZQCs) originating from distant dipolar interactions between spins in different molecules provide an innovative way for nuclear magnetic resonance (NMR) spectroscopy. Since the field experienced by iZQC signals is in the dipolar correlation distance, it is naturally to apply iZQCs for resolution enhancement i...
