SPECTRAL MANIFESTATION OF THE VIBRONIC SHIFT AND OCCURRENCE OF THE C-60(-) ANION IN STABLE SINGLE-CRYSTALS OF (PH(4)P)(2)C60Y,Y=CL,BR OR I,AND (PH(4)AS)(2)C60CL

Electronic and vibrational spectroscopy were used to study the electro nic processes in charge-transfer complexes of fullerene and tetrapheny lphosphonium or tetraphenylarsenium halides. ?These fully ionic crysta lline complexes feature the occurrence of C-60 monoanions and the onse t of charged phonon behavior, all of which were observed and discussed . The large downshift, the strong enhancement of the linewidth and of the oscillator strength were observed for the highest frequency F-1u m ode of C-60 in solid state complexes of Fullerene and organic donors.