Photophysical properties of the fullerene C60 core of a 6-arm polystyrene star

The photophysical properties of a new hexa-polystyrene adduct of C-60 were determined. This compound presented the characteristic features of a C-60 with multiple adducts in solution, i.e. a decrease of the triplet quantum yield and a blue shift of the triplet-triplet (T-T) absorption spectrum as compared to unlinked C-60. However the values of the quantum yield of singlet oxygen photosensitization and consequently of the triplet quantum yield were still relatively high, of the order of 0.65, This favorable triplet quantum yield, the high content of fullerene in (PS1400)(6)C-60, and the isotropic 3D structure apt to prevent close contact between fullerene cages might confer on this new compound good optical limiting properties. (C) 1999 Elsevier Science B.V. All rights reserved.