Hello All,
Thank you to everyone who replied about my query below and all the ideas
they presented me with. It looks very much like the asymmetric coupling I'm
observing between the P and H in the phosphite is due to cross correlation
relaxation effects so thanks to all those who sent papers and links
explaining this. For those interested, Glenn Facey sent a very simple and
understandable link which is below.
http://u-of-o-nmr-facility.blogspot.com/2015/05/trosy.html
Kind regards
Matthew
On 1 June 2021 10:28:12 Matthew Reid <karate562000_at_yahoo.co.uk> wrote:
> Hello All,
>
> I'm wondering if any of you could shed light on an asymmetric coupling
> between 1H and 31P (1J) in phosphorus acid. The stack plot attached shows
> the proton coupled and decoupled spectra and you can observe the asymmetry
> in the coupled spectra.
> The species in question is phosphorus acid in polyaminated polyisobutylene
> where the phosphorus like forms a complex with the polyamine which in turn
> has PIB groups attached at either end.
>
> Any ideas would be appreciated.
>
> Thanks
>
> Matthew Reid
> Afton Chemical
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Received on Thu Jun 03 2021 - 01:09:12 MST