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Accuracy of molecular dynamics obtained by T1ρ measurements on the microsecond time scale in solution

Measurements of T1ρ were performed for well characterized systems in which the number and population of exchange sites are known. These systems include the chair‐to‐chair isomerization of cyclohexane‐d11, a two‐site exchange model with equal population, and the cis‐trans isomerization of methyl nitrite, a general two‐site exchange model. The kinetic parameters obtained by T1ρ measurements were compared with other published results, and the predicted and observed chemical shift difference between the two sites at low temperature were more rigorously compared. These comparisons showed that measurements of T1ρ in solution provide a convenient probe of the molecular dynamics in solution on the microsecond time scale.