Light transmission spectra of THF solutions of poly(C60 co methyl methacrylate)s and poly (C60 co styrene)s continuously red shift with increasing concentration.Formation of fullerene nanoclusters may be responsible for the unusual spectral shift with concentration.It has long been scientists′ dream to “tune” material′s properties by simple means

and the C60 containing polymers represent such a group of novel materials whose optical properties are predictably and reversibly tunable by a simple change in concentration.