The effect of some organic addenda on the HOMO-LUMO gap in C60 fullerene

The photoluminescence of solutions of synthesized fullerene-containing star-shaped polystyrenes in toluene was studied at room temperature. The shift of the peaks in the photoluminescence spectra to shorter wavelengths compared to the spectrum of C-60 solution in toluene was observed. It was established that, in the first approximation, the magnitude of the shift is independent of the type of chemical bonding of fullerene with an addendum (the covalent nonpolar C-C bond or the covalent polar C-H bond); rather, this shift is controlled by the number of broken double bonds at the fullerene and by the corresponding redistribution of electron density. (C) 2001 MAIK "Nauka/Interperiodica".