A fullerene (C60) derivative, hydrogensulfated fullerenol, has been complexed with poly(4-vinylpyridine) (P4VPy) through a supramolecular approach. The complexes are formed by mixing the N,N-dimethylformamide (DMF) solutions of P4VPy and hydrogensulfated fullerenol with multiple -OSO3H groups. Glass transition temperatures can not be detected in all complexes due to the strong interaction between the two components. Both Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy demonstrated the ionic nature of the interaction in the complexes.