Question

1) For NMR, what are o2p and o1p?

2) How does one determine the correct values for these parameters?

Answer 1

1) For NMR, what are o2p and o1p?

Answer:

O1P - (transmitter frequency of f1 channel in ppm) offset 1 parameter;

O2P - (transmitter frequency of f2 channel in ppm) offset 2 parameter.

2) How does one determine the correct values for these parameters?

Answer: These are the terms mostly used in Bruker Topspin NMR spectrometers and relates to SF (signal Frequency) for different nucleus. It is mainly used in water suppression. Nowadys everything is automated pulse sequences. Just enter command at terminal or console "rpar ZGW" to find o1p of a water peak (no getprosol) because water peak intensity dominates nmr spectrum so we have suppress that signal to get actual compound signals with better resolution. ¹H & ¹³C nucleus have different offset parameters and should be used in your 2D & 3D NMR experiments, otherwise you see only one signal around 4.8 ppm in all spectra.

Please have a look at

http://chemsites.chem.rutgers.edu/~skim/nmr_training_setup_experiment.html

Hope this helped you!

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