Hello,
I have an iron carbene complex that form aggregation. When I used CDCl3 for HNMR, peaks were too broad, but when I used deuterated MeOH, I got a sharp peaks; however, the HSQC and HMBC were not good and have many dots on the whole spectra.
How can I get good HSQC and HMBC for this type of complexes?
Many Thanks
Dear Noha, does this link/work Article NMR analysis of an Fe(I)–carbene complex with strong magneti...
relate to what you see? Complex spectra seem to be a intrinsic property of this class of molecules. If you suspect that something is wrong (byound this complexeity) with your data you may want to upload a screen-short for discussion.Alfred
Is this molecule paramagnetic?
Do you know how come the line widths in CDCl3 and CD3OD are different?
Is it possible this molecule is undergoing conformational or chemical exchange between two or more structures?
Alfred Ross
Thanks for your reply.
Yes, the link is work.
when I run the HNMR in MeOD, it gave broad peaks, but 2D NMR are good. Running it in CDCl3 gives sharp peak in HNMR with noise in the base line, but HSQC and HMBC are so bad and they are attached.
This complex has trimethylsilyl (TMS) group and this observation only occurred with this group. For other groups, every spectra is good
Many thanks,
Noha
William C Hutton
Thanks for your reply.
1- I did not measure magnetism for it.
2-No, I don't know.
3- it is possible to undergo conformational exchange between two or more structures.
Thanks
Alfred Ross
A slight error.
It was bad in CDCl3 giving broad peaks and good in MeOD with sharp one.
Thanks
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