Dear Dr Mark
The Quat and carbonyl carbons are often difficult to acquire with good s/n.
You can try the "udeft" pulse program. I tried it and it gives really good
results over the traditional zip or zgig sequences.
I suppose this is a part of the standard Bruker pulse program library now.
If you have any problem I can send you mine...
I think this will take care of the long pulse repetition delays.
Best wishes
Avik
On 12 Mar 2015 23:22, "Mark Swanson" <mark94131_at_gmail.com> wrote:
> Hi Everyone,
>
> I would like to get a consensus for how long people typically set their D1
> delay to detect quaternary and/or carbonyl carbons. Our default at 500 MHz
> is 1s for 13C and the quaternary/carbonyl carbons are often weak. I tell
> students they have to increase the D1 delay but I give them vague answers
> for exactly how long it should be, 5s, 10s, 30s, 1 min? Without measuring
> the T1s I don't have an exact answer to give them and "trial and error"
> tends to waste a lot of instrument time. Sorry if this seems trivial but I
> would be interested in knowing what my colleagues recommend.
>
> Thanks,
>
> Mark Swanson
>
>
Received on Sat Mar 14 2015 - 01:32:16 MST