We report on new europium, strontium and ytterbium endohedral fullerene cages of the type Eu@C 72 , Sr@C 72 and Yb@C 72 . Single isomers of Eu@C 72 -I, Sr@C 72 -I, Sr@C 72 -II and Yb@C 72 -I were isolated by multi-step HPLC for the first time. Details of their synthesis, separation and characterization by LDI-TOF mass spectrometry and UV-vis will be discussed. Additionally, EPR spectroscopy of Eu@C 72 -I was performed. A second isomer of europium and ytterbium endohedral C 72 , Eu@C 72 -II and Yb@C 72 -II, has been separated by HPLC and identified by LDI-TOF mass spectrometry.

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