NMR and UV–VIS Investigation of water-soluble fullerene-60–γ-cyclodextrin complex

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Abstract
Fullerene-60 can be made water-soluble by forming an inclusion complex with γ-cyclodextrin (γ-CD). The complex between C60 and γ-CD is selectively formed; neither β- or α-CD, nor C70 takes part in complex formation. The UV–VIS and 13C NMR spectra of C60 in the complex are almost identical to those of C60 in organic solvents. The 1H NMR spectrum of the host, γ-CD, in the complex has been identified. Only small differences to the spectrum of the free host are observed; this is interpreted as being due mainly to a conformational change to a more conical structure in the host. Both 2 : 1 and 1 : 1 complexes between γ-CD and C60 are believed to exist in water. On heating in water, the complexes are transformed into water-soluble aggregates containing several fullerenes and γ-CD molecules. On addition of excess γ-CD to this solution and further heating, the initial complexes, monomeric in C60, are reformed.

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