Susceptible electron spin adhering to an yttrium cluster inside an azafullerene C79N.

Highly impressionable electron spin was found in endohedral azafullerene Y(2)@C(79)N at low temperature or upon exohedral chemical modification. These external stimulations can be employed to manipulate the spin-active Y(2)@C(79)N and can further be used in quantum processes for promising information-carrying spin systems and molecular devices.