La@C<sub>72</sub> Having a Non-IPR Carbon Cage

We show here that La@C<sub>72</sub> has a non-IPR cage, unique electronic properties, and high reactivity by the spectroscopic and X-ray crystallographic analysis and the theoretical study. The isolation of La@C<sub>72</sub> as a stable derivative might constitute an important stepping-stone on the way to isolation of these unknown metallofullerenes and open new material science of metallofullerenes.