Abstract
Alkali metal hyperfine coupling constants (an) for metal naphthalenides are measured in a number of sol- vents and solvent mixtures. The variation of an in mixtures of tetrahydrofuran and alkane are quantita- tively interpreted in terms of an equilibrium between ion pairs which differ in their outer solvation layers. Accordingly, rough correlations between am and the solvent dielectric constant, D, are exemplified for Li and Na naphthalenides in a number of different solvents. A linear variation of am with D~8, as is expected in case the solvent may be treated as a dielectric continuum, is shown to hold in some cases. A relationship between the hydrocarbon anion salts and the monomers observed in some alkali metal amine solutions is thereby inferred.