Investigation of cation-anion interactions in 2-propanol solutions of sodium alkoxides and thiolates by Na-23-NMR spectroscopy

Cation-anion interactions in 2-propanol solutions of sodium salts NaY (Y = MeS, iPrS, tBuS, iPrO, SCN, ClO4, Ph4B) have been studied by Na-23-NMR spec troscopy, 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 cha rge-delocalized anions (SCN-, ClO4-, Ph4B-), and that the degree of associa tion in NaSR salts is greater for R = tBu than for R = Me.