STRUCTURAL CHARACTERIZATION OF THE NEW FULLERENE RARE-GAS COMPOUND AR1C60

We communicate how C-60 Hot Isostatically Pressed (HIPed) at 200 degre es or 400 degrees C with a pressure of 1.7 kbar of Ar produces the new fullerene-rare gas compound Ar1C60. We have shown, using Xray powder diffraction and subsequent Rietveld analysis, that this solid can be c haracterised stoichiometrically as Ar1C60. The stoichiometry has also been confirmed by thermal gravimetric analysis (TGA) showing 5% by wei ght to be Ar (expected=5.25%). The presence of Ar is confirmed by tran smission electron microscopy (TEM) and energy dispersive X-ray spectro scopy (EDS). This material is found to be remarkably stable to loss of Ar over several weeks at room temperature. This represents the first full characterisation of an interstitial rare gas fullerene compound.