Photophysical properties of the fullerene C-60 core of a 6-arm polystyrenestar

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