Currently studying NMR spectroscopy, and I'm slightly confused about the splitting patterns. I would really appreciate it if someone could answer my following questions:
1) When the book talks about different environments, am I looking just at the two/one on either side or do I need to look at all the atoms the H is attached to in the molecule? In which case surely all the H atoms would have unique environments?
2) If you had e.g. ch3-ch2-ch2 what would the splitting pattern be for the middle H atoms since they have two adjacent carbons?
3) I know -OH and -NH atoms don't split or cause splitting in adjacent hydrogens. Is this correct and if so, what would the splitting pattern of the middle atom be in e.g. CH3-CH2-OH?
Thanks for the help!
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NMR splitting patterns??? watch
- Thread Starter
- 13-03-2018 20:56
- 13-03-2018 21:15
Only the adjacent carbons, so ch3-ch2-ch2 looking at the middle carbon would be a multiplet with 6 peaks ( 5 adjacent protons 1, using the n 1 rule). Usually however the ch3-ch2 group is bonded to as you say an enviroment with no protons like an -OH or on the end of an ester c-o-ch2-ch3 in which case you get a triplet (on the end carbons protons), multiplet (for the middle due to the -ch3 thats adjacent, the -oh does nothing here) and the singlet peak from the -OH. Hope that makes sense it is quite a tough topic in exams.