What causes this signal splitting, and what useful information can be ...
3/06/2014 10:43:58 AM GMT
What causes this signal splitting, and what useful information can be ... 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:
[NMR paper] 1H, 15N, and 13C NMR signal assignments of IIIGlc, a signal-transducing protein of Es
1H, 15N, and 13C NMR signal assignments of IIIGlc, a signal-transducing protein of Escherichia coli, using three-dimensional triple-resonance techniques.
Related Articles 1H, 15N, and 13C NMR signal assignments of IIIGlc, a signal-transducing protein of Escherichia coli, using three-dimensional triple-resonance techniques.
Biochemistry. 1991 Oct 15;30(41):10043-57
Authors: Pelton JG, Torchia DA, Meadow ND, Wong CY, Roseman S
IIIGlc is an 18.1-kDa signal-transducing phosphocarrier protein of the phosphoenolpyruvate:glycose phosphotransferase...
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08-21-2010 11:12 PM
[NMR paper] 1H, 15N, and 13C NMR signal assignments of IIIGlc, a signal-transducing protein of Es
1H, 15N, and 13C NMR signal assignments of IIIGlc, a signal-transducing protein of Escherichia coli, using three-dimensional triple-resonance techniques.
Related Articles 1H, 15N, and 13C NMR signal assignments of IIIGlc, a signal-transducing protein of Escherichia coli, using three-dimensional triple-resonance techniques.
Biochemistry. 1991 Oct 15;30(41):10043-57
Authors: Pelton JG, Torchia DA, Meadow ND, Wong CY, Roseman S
IIIGlc is an 18.1-kDa signal-transducing phosphocarrier protein of the phosphoenolpyruvate:glycose phosphotransferase...