Romanosow - 19-3-2015 at 00:47
in my compound i have two -O-CH2CH2CH2-NPHth groups, and in NMR spectra these groups are typically as two triplets and one multiplet. But in this
compound i have strange spin system. Does anyone know what kind of spin system is?
Metacelsus - 19-3-2015 at 06:50
Could the one on the right be a septet, from an isopropyl group?
The one on the left looks like it could be a doublet of doublet of doublets.
Can you tell us the J values?
Chemosynthesis - 19-3-2015 at 11:31
It might be easier with the structure rather than vagaries also. I had asked in another thread and you never replied. ChedditCheese is right, j-values
would be nice, since I don't believe we have the frequency of your machine.
Romanosow - 20-3-2015 at 00:32
Thanks for reply! I added the structure and NMR spectra in archive.
Attachment: E145-1.1.fid.zip (193kB)
This file has been downloaded 280 times
Chemosynthesis - 20-3-2015 at 02:17
Oh, wow. I guess the possible leaning on those ether peaks should have been a warning to me, but that is a bigger molecule than I usually deal with
(and they give me an NMR specialist), and the lack of symmetry in the R group intimidates me, so I doubt I could be of much help. I would be curious
to see if your spectra coupling changes with solvent, such as swapping out deuterated chloroform for benzene. Sorry I'm not of more help.
Romanosow - 20-3-2015 at 07:48
Thanks! I think the CH2 group with O atom have ABX2 spin system because the structure is not symmetrical, I am right?
Romanosow - 20-3-2015 at 07:53
But in net i dont find the samples with ABX2 or ABC2 system. Maybe Can someone advise a book on spin systems?
Chemosynthesis - 20-3-2015 at 15:24
J. K. M. Sanders and B. K. Hunter's Modern NMR Spectroscopy or perhaps M. H. Levitt's Spin Dynamics. I am under the impression you'll need computer
modeling for something that looks that complex, but I could just be ignorant.