alignment of protons in a spinning nucleus in a static magnetic field
16/03/2014 4:10:16 PM GMT
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[NMR paper] Magic-angle spinning solid-state multinuclear NMR on low-field instrumentation.
Magic-angle spinning solid-state multinuclear NMR on low-field instrumentation.
Related Articles Magic-angle spinning solid-state multinuclear NMR on low-field instrumentation.
J Magn Reson. 2013 Nov 1;238C:20-25
Authors: S๘rensen MK, Bakharev O, Jensen O, Jakobsen HJ, Skibsted J, Nielsen NC
Abstract
Mobile and cost-effective NMR spectroscopy exploiting low-field permanent magnets is a field of tremendous development with obvious applications for arrayed large scale analysis, field work, and industrial screening. So far such...
nmrlearner
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12-03-2013 12:49 PM
[NMR analysis blog] Alignment of NMR spectra Part IV: Advanced Alignment
Alignment of NMR spectra Part IV: Advanced Alignment
Previous posts on this series:
Alignment of NMR spectra Part I: The problem
Alignment of NMR spectra Part II: Binning / Bucketing
Alignment of NMR spectra Part III: Global Alignment
As I mentioned in my previous post, simple alignment based on shifting or referencing the whole spectrum is not enough in cases where there are different local chemical shift fluctuations.
Resorting back to the synthetic data set used in the previous posts, let me introduce a semi-automatic method designed specifically to align spectra having...
nmrlearner
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02-07-2011 07:53 PM
[NMR analysis blog] Alignment of NMR spectra Part III: Global Alignment
Alignment of NMR spectra Part III: Global Alignment
Previous posts on this series:
Alignment of NMR spectra Part I: The problem
Alignment of NMR spectra Part II: Binning / Bucketing
We have seen that binning helps in minimizing, for example, the effect of pH-induced fluctuations in chemical shift so that, in the field of NMR-based metabonomics studies, ensuring that signals for a given metabolite appear at the same location in all spectra. One evident disadvantage of binning is that it greatly reduces the spectral resolution (e.g. in a 500 MHz instrument, a typical 64 Kb...
alignment in a magnetic field
hi all,
I have a general question about alignment in a magnetic field.
For me, alignment in alignment media is easier to grasp because of interactions that I am familiar with as a chemist.
But, whats the principle behind molecules that align in a magnetic field?
There are a lot of examples like cyanometmyoglobin (from the Prestegard paper) where paramagnetic susceptibility plays a role. Thats understandable from my side.
But what about for instance short DNA dimers (helices), collagen gels or bacteriophages?
I could not really find a nice (clear to me) explanation, why these...
Hydrazin
NMR Questions and Answers
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09-23-2010 06:13 PM
NMR of Naphthalene: why are the alpha-protons more downfield than the beta- protons?
Hi, can you please help me explain why the alpha-protons of naphthalene are further downfield? I know that the protons at the alpha position must be more deshielded, but I don't know how to explain why they have less electron density compared to the beta protons. Does this have to do with the number of double bonds that can be drawn in different resonance structures? Thanks for your help!Thanks so much!