ESR Study of the Association of 1,8-Di-tert-Butylnaphthalene Anions with Sodium and Potassium Cations.

摘要

Electron spin resonance studies of the association of the non-planar 1,3,8-tri-tert-butylnaphthalene or 1,3,6,8-tetra-tert-butylnaphthalene anions with alkali metal cations revealed an alternating linewidth arising from cation motion between opposite sides of the median plane. The rates of motion were determined from simulation of the spectra. Activation energies determined from the rates were small and either postive or negative for loose ion pairs. The apparent negative activation energy was attributed to changes in solvation. Tight ion pairs exhibit no significant linewidth variation, but do exhibit anomalous changes in proton hyperfine splittings which suggest that the aromatic system can bend to accommodate the alkali metal. (Author)