Again, the splitting has been exaggerated for clarity. Thissplitting ...
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20/06/2013 10:09:49 AM GMT
Again, the splitting has been exaggerated for clarity. Thissplitting ... More...
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[Question from NMRWiki Q&A forum] Concentration-dependent signal fine splitting
Concentration-dependent signal fine splitting
Hi,
I have synthesized coproporphyrin II tetramethyl ester and taken a 1H NMR in CDCl3:
http://illumina-chemie.de/upload/5_11600286385136157fa7971.png
Especially the peaks at 10.1 ppm, belonging to the CH groups connecting the pyrrole rings, show a strong concentration dependence. They should be two singlets, but in fact they are only singlets at very low concentrations and split up with increasing concentration:
nmrlearner
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03-06-2013 04:21 AM
Unequal quadrupolar splitting intensities
Hi everyone
I'm running an experiment looking at a mesoporous organosilica soaked in benzene-d6. The pores are tubular and aligned more or less in the same direction, so the anisotropic environment causes quadrupolar splitting when looking at deuterium. However, the splitting intensities are not equal: the left peak tends to be noticeably larger (~10-20%) than the right. Have tried this with the sample at different orientations in the field. At some angles, such at 180 degrees, the peaks are nearly equal in intensity, but at the rest of them the left is higher.
So my question is: what...