Mechanistic insight into formation and changes of nanoparticles in MgF2 sols evidenced by liquid and solid state NMR

The fluorolytic solgel reaction of magnesium methoxide with HF in methanol was studied by 19 F, 1 H and 13 C liquid and solid state NMR. In 19 F NMR five different species were identified, three of which belong to magnesium fluoride nanoparticles, i.e. NMR gave access to local structures of solid particles in suspensions. The long-term evolution of 19 F signals was followed and along with 19 F MAS NMR experiments of sols rotating at 13 kHz mechanistic insights into the ageing processes were obtained. The fluorolytic solgel reaction of magnesium methoxide with HF in methanol was studied by 19 F, 1 H and 13 C liquid and solid state NMR. Five different species were identified, three of which belong to magnesium fluoride nanoparticles.