Solubility of Fullerenes C60 and C70 in Water

Physics

Scientific paper

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Fullerenes, Geochromatography, Hildebrand Parameter, Solubility, Water

Scientific paper

Fullerenes C(sub)60 and C(sub)70, the all-carbon molecules with closed-cage structures, have been found naturally in soot-rich clays and marls at the Cretaceous-Tertiary boundary. All were marine sediments which were permeated by water even after the consolidated rocks had become uplifted above sea level. Because of this, one would like to know the solubilities of C(sub)60 and C(sub)70 in water in order to evaluate how much of the fullerenes might have been leached from the sediments since their formation about 65 My ago. A direct easurement yielded essentially zero solubility. The solubilities of C(sub)60 and C(sub)70 at 25 degrees C in seven normal alcohols obey the relationship lnY = a + bX + cX^2, where Y is molefraction and X is the Hildebrand solubility parameter of the solvent. Extrapolation to the solubility parameter of water gave solubilities for C(sub)60 and C(sub)70 of 1.3 x 10^(-11) and 1.3 x 10^(-10) ng/ml respectively with an uncertainty of one order of magnitude.

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