Hey
So I'm having some problems with some NMR spectra I find very puzzling.
Basically I have a Ph3P-BH3 compound, and two spectra.
Both are B11 spectra, but one is proton decoupled and one is not. On the decoupled spectrum I have what I expect. A doublet, indicating the presence of the adjacent phosphor group.
But on spectrum which isn't decoupled I have a sextet. This is confusing for me because there are only 3 protons and 1 phosphorus atom for the Boron to couple with. So why do I have a quintet not a sextet?