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  • Title: Long-lived states in solution NMR: theoretical examples in three- and four-spin systems.
    Author: Grant AK, Vinogradov E.
    Journal: J Magn Reson; 2008 Aug; 193(2):177-90. PubMed ID: 18511314.
    Abstract:
    Long-lived spin states have been observed in a variety of systems. Although the dynamics underlying the long lifetimes of these states are well understood in the case of two-spin systems, the corresponding dynamics in systems containing more spins appear to be more complex. Recently it has been shown that a selection rule for transitions mediated by intramolecular dipolar relaxation may play a role in determining the lifetimes of long-lived states in systems containing arbitrary numbers of spins. Here we present a theory of long-lived states in systems containing three and four spins and demonstrate how it can be used to identify states that have little or no intramolecular dipolar relaxation.
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