I am a novice to NMR and need help in understanding what i am looking at in terms of 11B 3Q MAS NMR graphs. Any resources for beginners would be helpful in interpreting the data. Literature only helps those with prior experience
Hi Katrina, the NMR field is really quite advanced in my opinion, and even though 3Q MAS NMR is quite old now, it's still a rather advanced technique and hard to grasp for a beginner (I include myself despite having studied NMR 'a lot' in the past). I think it is possible to learn how to interpret spectra from the literature, without a deep knowledge, but this is of course risky. I'd recommend a good solid state NMR textbook, or more broadly Malcolm Levitt's 'Spin Dynamics' for learning background about chemical shift and quadrupolar interactions etc. as this all builds into the more complex NMR experiments.
In the end, 3Q MAS is a way to resolve sites with different chemical shifts, and extract information about their quadrupolar interaction parameters (coupling constant and asymmetry).
Sorry I can't be more helpful, best wishes, Ollie
Thanks Ollie for taking the time out to answer my question. NMR is indeed something you spend a life time studying to truly understand it, and I am merely dipping a toe in. I will have a look for the book you recommended.
I'm a bit late in my answer but maybe it can be still helpful.
The 2D plot has a direct dimension (often called F2) which in a projection (summing up all signals) resembles the 'normal' MAS spectrum quite well, intensities of different sites can be different due to different excitation efficiencies.
The indirect dimension (often F1) is an isotropic dimension displaying individual sites by Gaussian lines in the projection. This is, however, only true if a 'shearing transformation' is done. So watch if that is written in the text to the figure.
In the 2D plot, if the indirect dimension is plotted horizontally, for each site you can show (and later fit) the lineshape for each individual site. This is correct as long as there are no distributions in quadrupolar coupling or chemical shift present.
Maybe that helps at first. You can also email me again.
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