Mapping techniques spin systems

The experiments based on proton detection of rare spin nuclei are usually the most sensitive methods of determining NMR parameters of magnetically diluted spin systems. Unfortunately, recording of 2D correlation maps is usually also a time consuming experiment, especially if wide spectral bands have to be covered in the indirectly detected dimension. The most frequently encountered situation is that only one or a few peaks are expected within a narrow spectral band. However, the position of this band is not known. Several attempts have been made to reduce the experimental time needed to perform such experiments. One approach would be to record a highly truncated data set and use the linear prediction [86,87] to reduce the effect of the data truncation on the appearance of the spectrum. This technique is now available with most... 

In spite of its recent development, the D-HMQC technique has been used in many studies to edit 2D correlation maps or filtered ID spectra in systems containing a quadrupolar and a spin-1/2 nuclei. This sequence can thus be considered as an efficient alternative to the CP experiment that is much more complicated to optimise and strongly suffers from offset dependence... 

We developed 3ip NMR by spin echo mapping to study VPO catalysts. With this technique, it is possible to discriminate between the phases of this system with vanadium in different valencies and corresponding to different environments (5-6). 

---