Hydrogen intercalation in potassium-C-60

Solid state H-1 NMR of (KH)(3)C-60 was measured in the temperature range be tween -80 and 60 degrees C. A doublet spectrum composed of main peak at -7. 0 ppm and shoulder peak at similar to 0 ppm was observed at room temperatur e. The negative chemical shift of the main peak indicates that hydrogen in (KH)(3)C-60 exists as a hydride-like ion. The 60 degrees C spectrum became singlet at -5.8 ppm due to motional narrowing.