GIDRM News
2D-NMR in Earth's Magnetic Field (Aug 09, 2006)
Although all NMR textbooks usually categorize 2D techniques into two groups according to the homonuclear-heteronuclear paradigm, other approaches exist. At very low magnetic fields, such as the Earth's magnetic field (about 0.6 G), resonance frequencies of different nuclei are close and can be all excited at the same time with a single pulse. If J-couplings exist between different nuclei they can be exploited in a COSY-type experiment which is neither homo- nor heteronuclar, but something in-between, where each dimension carries the signals from all NMR-active nuclei in the molecule under study.
This (and more) is elegantly shown in a forthcoming paper in JMR by Robinson et al: an enjoyable read for the real NMR afficionado.
