Long-lived nuclear spin states in the solution NMR of four-spin systems.
The existence of long-lived nuclear spin states in four-spin systems is explored by solution-state NMR experiments. Long-lived states are proved to exist in three different natural product molecules, each containing either a AA'BB' or a AA'XX' proton spin system. The measured state lifetimes are between four and eight times the spin-lattice relaxation time constants.
Pileio
Giuseppe
G
Department of Chemistry, University of Calabria, via P. Bucci, Italy.
Concistrè
Maria
M
Carravetta
Marina
M
Levitt
Malcolm H
MH
D010129:4-Aminobenzoic Acid / Q000737:chemistry*; D019343:Citric Acid / Q000737:chemistry*; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods*; D010226:Parabens / Q000737:chemistry*
D010226:Parabens; D019343:Citric Acid; C038193:4-hydroxybenzoic acid; D010129:4-Aminobenzoic Acid