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82 in agreement with the observation of a signal in electron spin resonance experiments [4 ‐ 6]. This view is also consistent with theoretical predictions [9] and with the analysis of the electron density distribution of a Y@C82 microcrystal as measured by x-ray diffraction [10]. Very few direct studies of the valency of the various endohedral metal ions have been reported. Xray photoemission spectroscopy (XPS) has been shown to be a suitable probe of the valency of the La in La@C82 [5,11]. In this case, the comparison of the La 3d core level spectrum with those of various La trihalides showed that the La is trivalent, with the sC82d 32 providing an environment slightly less electronegative than that in LaBr 3 [11]. In the case of the lanthanide monometallofullerene Tm@C82, a series of physical and chemical studies in solution of the three different isomers has been found to be consistent with a Tm 21 @C 22

physical review letters

Monometallofullerene<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>T</mml:mi><mml:mi>m</mml:mi><mml:mo>@</mml:mo><mml:mi>C</mml:mi></mml:mrow><mml:mrow><mml:mn>82</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>: Proof of an Encapsulated Divalent Tm Ion by High-Energy Spectroscopy

MonometallofullereneTm@C82: Proof of an Encapsulated Divalent Tm Ion by High-Energy Spectroscopy