ADDITION OF INORGANIC RADICALS TO C-60 - DERIVATIVES OF PF4C60

The EPR spectrum of PF3((OB)-B-t)C-60, a derivative of PF4C60, is desc ribed and discussed. It is concluded that, in the trigonal bipyramidal arrangement of bonds around the phosphorus atom, two of the fluorine atoms occupy axial positions, as might be expected from their electron egativity. The C-60 and (OB)-B-t ligands, and the third fluorine atom, occupy equatorial positions. The enthalpy barrier to Berry pseudo-rot ation about the P-C bond is 9.2 +/- 1.1 kcal/mol.