J. Onoe et K. Takeuchi, HOW MANY [2-MEMBERED RINGS ARE FORMED ON A C-60 MOLECULE WHEN PHOTOPOLYMERIZATION IS SATURATED(2]4), Physical review letters, 79(16), 1997, pp. 2987-2989
The saturation number of the [2 + 2] four-membered cross-link between
adjacent C-60 molecules in a photopolymerized C-60 film has been deter
mined using the intensity of the C 1s shake-up satellite, which origin
ates from the pi-pi transition of pi electrons of C-60, by x-ray phot
oelectron spectroscopy. It was found that six [2 + 2] rings were forme
d on a C-60 molecule when polymerization was saturated. A possible con
figuration of the C-60 polymer was postulated on the basis of the satu
ration number and the structure of a pristine C-60 film.