Abstract
The yield and stability of fullerenes with carbon cages in the size gap between C 70 and C 84 is strongly dependent on the metals included. It is shown for C 72 and C 74 cages that they can be stabilised by metal ion inclusion. A review is given for new fullerene structures. A number of new endohedral fullerenes were isolated and described in their optical and redox properties. New fullerene structures presented are: La 2 @C 72 , Ce 2 @C 72 , Eu@C 74 , Tm@C 78 , and Sc 3 N@C 80 . The existence of a selected cage size and isomeric cage is discussed with respect to the metal and its redox state.
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