Abstract
The EPR spectrum of PF 3(O t B)C 60, a derivative of PF 4C 60, is described 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 electronegativity. The C 60 and O t B ligands, and the third fluorine atom, occupy equatorial positions. The enthalpy barrier to Berry pseudo-rotation about the PC bond is 9.2±1.1 kcal/mol.
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