Two-dimensional NMR spectroscopy in Earth's magnetic field.
We demonstrate the first two-dimensional correlation NMR (COSY) spectra obtained at ultra low frequencies (ULF) using the Earth's magnetic field. Using a specially developed spectrometer with multiple audio-frequency pulses under controlled pulse phase, we observe magnetisation transfer arising from heteronuclear J-couplings in trifluoroethanol and para-difluorobenzene. The 2D COSY spectra exhibit all diagonal and off-diagonal multiplets consistent with known J-couplings in these molecules.
Robinson
Jeremy N
JN
MacDiarmid Institute, Victoria University of Wellington, New Zealand.
Coy
Andrew
A
Dykstra
Robin
R
Eccles
Craig D
CD
Hunter
Mark W
MW
Callaghan
Paul T
PT