Springer Online Journal Archives 1860-2000
Abstract The selfassociation of various purine- and pyrimidine-derivatives in D2O has been studied by means of NMR technique. The thermodynamic quantities have been calculated using an isodesmic NMR model. Among the nucleobases investigated, the adenine-derivatives were found to be most suitable for quantitative determination. A comparison of methylated adenine-derivatives and the pH-dependence of the selfassociation lead to the conclusion, that the stacking associates are stabilized by special van der Waals interactions based, essentially, on the polarizability of the π-electron-system of the associated molecules.
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