Complexation of fullerenes

Organometallic Complexes of Fullerenes Adam H. H. Stephens and Malcolm L. H. Green... 

M. Makha, A. Purich, C. L. Raston, A. N. Sbolev, Strucutral diversity of host-guest and intercalation complexes of fullerene C60. Eur. J. Inorg. Chem. 2006, 507. 

Kiselev O, Kozeletskaya K, Melenevskaya E et al. (1998a) The antiviral activity of the complex of fullerene C60 with poly(N-vinyl-pyrrolidone). Mol Mat. 11 121-124. 

Krakovjak MG, Anufrieva EV, Piotrovskij LB et al. (2005b) Water-soluble complex of fullerene with poly-N-vinylpyrrolidone and method for preparing these complexes. Russian patent RU 2 255 942 20.02.2005. 

Vinogradova LV, Melenevskaya EYu, Khachaturov AS et al. (1998) Water soluble complexes of fullerene C60 with poly-N-vinylpyrrolidone. Vysokomol Soed. 40 1854-1862 (Russian). 

The bowl-shaped hydrocarbons give an opportunity to study convex versus concave preferences for complex formation which relates to the interest in endo-hedral complexes of fullerenes. 

The complexation of fullerenes and y-cyclodextrin was found to take place more efficiently by the use of a HSVM. Thus, when Cgo was vigorously shaken with 4 molar equivalents of y-cyclodextrin for only 10 min by HSVM and the resulting mixture dissolved in 4 mL of water, a magenta-colored solution of Cgo was obtained by filtration with a membrane filter (Scheme 1) [16]. The concentration of Cgo was 1.4x10 mol L which is the highest value for Cgo dissolved in water. When this aqueous solution was let stand for 2 weeks, the Cgo-y-cy-clodextrin 1 2 complex was obtained as purple crystals. 

Konarev DV, Khasanov SS, Saito G, Otsuka A, Yoshida Y, Lyubovskaya RN (2003) Formation of single-bonded (C6o )2 and (C7o 2 dimers in crystalline ionic complexes of fullerenes. J Am Chem Soc 125 10074-10083... 

AC and AEC complexation is also effected efficiently by other macrocyclic ligands such as the spherands 13, cryptospherands 14 [2.9, 2.10], calixarenes [2.38, A.6, A.23], torands [2.39], etc., some of them, for instance the spherands displaying particularly high stabilities. A special case is represented by the endohedral complexes of fullerenes in which the cation (Sr2, Ba2+, lanthanides) is locked inside the closed carbon framework [2.40],... 

Kim et al. observed a very fast ion pair formation (below their detection limit of about 1 ps) from transient absorption spectra of fullerenes in the presence of aromatic amines such as /V,/V-dimcthyl- or /V,/V-dicthyl-anilinc, corresponding to a rate > 1 X 1012 M-1 s-1. An explanation for such extremly fast electron transfer is most likely a ground-state complex of fullerene and amine. Excitation leads to the neutral aminc/ C 0 contact pair followed by electron transfer. The decay of the both transient absorption from Cfo and Qo/amine occurs with the same rate suggesting that charge recombination is the major nonradiative relaxation channel [138],... 

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