Abstract
ESR spectra observed at 120 K in γ-irradiated solid solutions of PF 5 in neopentane and AsF 5 in SF 6 are ascribed to the radical ions PF 5 − and AsF 5 − in which the unpaired electron interacts strongly with the central nucleus and with four equivalent 19F nuclei. Hyperfine interaction with the fifth 19F nucleus was not resolvable in either case. The spectra were quite distinct from those of the tetrafluorides PF 4 and AsF 4, thus eliminating the possibility that they were due to tetrafluoride radicals undergoing rapid intramolecular 19F exchange.
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