I've attached two images so that you see what I mean. For an example chemical, I've attached the NMR collected in our lab of ethyl nicotinate which was our starting solution. I have also attached a literature NMR spectrum for ethyl nicotinate which I collected from SciFinder. The two spectra are very similar, and they match the locations in which one would expect to find peaks by plugging ethyl nicotinate into a chemical H-NMR spectra prediction software. But only in our spectrum can you see the peaks splitting in such an unusual manner.
Why might this occur?
Note that the solvents (deuterated chloroform) used in both analyses are the same.
Thanks for all the help, folks.
I apologize about the file extensions. My computer has some weird default saving formats.
I also looked at the spectra, and I agree with Clemens as well with Peter. The integrals do confirm the 3/2/4 CH3/CH2/aromatic protons. Good luck in your research.
MHT can be opened by MS Word.
Please don't compare spectra at different expansion scales since you will miss the details. They are the same, the "stepwise" thing is not a part of the spectrum, it represents the integration performed on Topspin, the processing software. You should get a copy of Topspin or any processing software and get familiar with this stuff. It's very basic. Topspin is free for academics.
You have got good spectra which corresponds to your molecule Ethyl nicotinate. Regarding your query, horizonatal line corresponds to the ratio of hydrogens that correspond to the signal which is matching with your reference spectra. Have a good and nice research
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