Abstract
We have synthesized fullerene derivatives, C 60 [CO(CH 2 ) 5 O (CH 2 ) 4 SO 3 Na] 6 (FC 10 S), which consists of a C 60 cage covalently bonded with six sulfonated arms for a high water solubility. We study the aggregation structures of the novel C60-derivatives in 0.1 M NaCl aqueous solutions by small angle X-ray scattering (SAXS). In the concentration range studied, 0.5 wt% to 2 wt %, the rod-like structure of FC 10 S aggregates has a radius of 20 Å and a rod-length about 150 Å at 25°C, and the aggregation structure is insensitive to the concentration change. The aggregates, however, grow in length as the temperature increases, while the radius increases slightly with increasing temperature.