Hi,
I am trying to assign the peaks on the 1H-NMR spectrum for two unknowns. I have identified them as 2-propanol and benzyl alcohol.
For 2-propanol, I have an unmagnified spectrum (taken at 500Mz), and one where the spectrum is zoomed in on one peak.
I believe it's the alcohol peak.
But how do I describe it? Is it a doublet? Why is it split? Is it coupled to anything else? (It has a coupling constant that suggests it coupled to CH...but I thought the OH group did not couple).
(I apologise if the size is small large - the two numbers on the peak I'm looking at are 3.144ppm and 3.186ppm...the triplet upfield is for the 2 methyl groups and the septet downfield is for CH)
And magnified on the alcohol peak:
Then for benzyl alcohol:
Why are there two peaks, one at 1.868 and another at 2.178ppm? All the other spectra I was given (C-NMR, MS, IR) show the compound to be benzyl alcohol.
The peak at 4.637 (singlet) is for the CH2, the peaks around 7 are for the aromatic hydrogens...then one of those peaks at 2.178 and 1.868 is for the alcohol. Perhaps both?
The one at 2.178 integrates for 1H. The peak at 1.868ppm has no integration given...what is it?
The solvent used in both instances was CDCl3 and I believe the peak at 0ppm is TMS.
Lastly, the mass spectrum for benzyl alcohol has a base peak at 79 m/z. I am trying to assign the peaks eg 77 for Ph+...what does the base peak correspond to? What fragment?
Thanks alot