AMMRL: Proton spectrum of estragole with long relaxation delay - summary

Hello again,

 

many thanks to Ulrich Haunz, Stefan Berger, Matthias Niemitz and Sebastian Kemper.

 

Now I have well relaxed data sets from 250 MHz to 600 MHz.

 

About the relaxation times.

 

Relaxation times of protons may well be in the range of a minute.

Maybe some of you can remember Adam Allerhand with proton FIDs of more than

one minute.

 

https://pubs.acs.org/doi/10.1021/ja00306a043

 

Somewhat more recent is a note by Albin Otter, who also measured T1 times of more than 20 seconds,

despite potentially good dipole-dipole relaxation.

Since the information is somewhat hard to search, because it’s an iFrame, here is a copy with the essential content

 

https://www.nmr.tips/AMMRL/iframe.html

 

My special thanks goes to Matthias Niemitz for giving me access to his quantum mechanical software.

As an old man it takes me some time to find my way around with it. :-)

 

Greetings

 

Rainer