Phase sensitive 2D homonuclear shift correlation experiment using gradient pulses for selection and double quantum filter to remove uncoupled singlets.
Correlates chemical shifts of spins that have a mutual J-coupling that are 2 to 4 bonds apart.
Gradients eliminates the need for phase cycling and helps reduce T1 noise
Scans per Slice
(ns)
Dummy Scans
(ds)
Recycle
Delay
(d1)
FID Size
(TD, F2)
# Slices
(TD, F1)
Spectral
Width
(sw,ppm)
Spectral
Center
(o1p, ppm)
1x ns (1)
16
2
2048
256
13
6
Experiment Setup
Minimize spectral width in F2 dimension to cover entire spectrum and enter matching window in F1 dimension
Move o1p to center of spectral window
If T1 noise present, it usually comes from various sources such as instrument instability and temperature fluctuations.
Processing Notes
Fourier transform with the command xfb
Symmetrize spectrum using the command syma
For improved resolution, can try applying linear prediction in the F1 dimension. In the ProcPars tab set the following parameters:
