We report the isolation and characterization of an endohedral metallofullerene encapsulating three lanthanide atoms inside a nanoscale C 80 cage, Lu 3 N@C 80 . In addition, we also report encapsulated mixed-metal species of gadolinium/lutetium and holmium/lutetium, Lu 3-x A x N@C 80 (x ) 0−2), which may prove useful as multifunctional contrast agents for X-ray, MRI, and radiopharmaceuticals.
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