Published in
Elsevier, Journal of Magnetic Resonance, 2(182), p. 353-357
DOI: 10.1016/j.jmr.2006.06.034
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Long-lived nuclear spin states in the solution NMR of four-spin systems
Journal article published in 2006 by
Giuseppe Pileio,
Maria Concistrè,
Marina Carravetta,
Malcolm H. Levitt 
This paper was not found in any repository, but could be made available legally by the author.
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Abstract
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.