Investigation of Cation-Anion Interactions in 2-Propanol Solutions of Sodium Alkoxides and Thiolates by ~(23)Na-NMR Spectroscopy

摘要

Cation-anion interactions in 2-propanol solutions of sodium salts NaY (Y = MeS, iPrS, tBuS, iPrO, SCN, ClO_4, Ph_4B) have been studied by ~(23)Na-NMR spectroscopy. The analysis involved measurements of chemical shift and T_1 as a function of salt concentration in both the absence and presence of the Na~+-complexing agent 18-crown-6. The results indicate that the interactions of Na~+ with alkoxides and thiol anions are very different from those with charge-delocalized anions (SCN~-, ClO_4~-, Ph_4B~-), and that the degree of association in NaSR salts is greater for R = tBu than for R = Me.