Dear Friends
A.Presently I am working on Lead
NMR(Pb-207) in its
complexes with cryptands.In standardising the pulse
for this I am getting problem.I have taken Pb(NO3)2
(4M) as standard in D2O.On scanning from 10000 to
-6000 I am not getting any signal
, therefore I want to know
1.Exact Chemical shift value.
2.d1 value(interpulse delay)
3.rg(Reciever gain)
or any other parameter which I have to take care of.
and if some web sites or some literature regarding
this .
Similar kind of problem I am facing in Silver NMR
in its complexes with cryptands.In
standardising the pulse for this I am getting
problem.I have taken AgNO3(4M) as standard in D2O.
As signal is getting saturated if I run it say for ns
=4 with d1=10sec at rg=5000 .Regarding this I thought
may be relaxation time of silver is too hihg and took
AgNO3 with the ligand(1:1) which is my complex ,
inthis case also signal is getting saturated and in
both the cases I am getting two
signals one at 2730.0 ppm and 2840.0 ppm, therefore I
want to know.
1.Exact Chemical shift.
2.d1 value
3.rg
4.Is the relaxation time for silver is too high.
and if some web sites or some literature regarding
this .
With a hope I have written it to you and I am sure
that you will give me response.Looking forward to
your
mail.
With Kind Regards
Dr Raja Roy
Manager
NMR Laboratory
Central Drug Research Institute
Lucknow
India
( An AMMRL member )
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Received on Fri Sep 01 2000 - 16:10:21 MST