Fullerene, hydration

Keywords antifreeze protein P-helix C6o fullerene hydration hydrophilic surface explicit water model ice crystal icosahedral water cluster polyoxomolybdate colloid... 

Buvari-Barcza A, Rohonczy J, Rozlosnik N et al. (2001) Aqueous solubilization of [60]fullerene via inclusion complex formation and the hydration of C60. J Chem Soc Perkin Trans. 2 191-196. 

In spite of this, the structure of colloidal particles of FWS remains yet hypothesized only. Current model, which is not at variance with known experimental data, intends that FWS contains both single fullerene molecules and their fractal clusters in hydrated state [5],... 

Abstract. The relationship of hydration properties of carbon nanoparticles in aqueous dispersions and stability of these dispersions with respect to aggregation have been studied using EPR spin probing of frozen dispersions. Aqueous dispersions of shungite carbon nanoparticles at different concentrations and aqueous colloids of fullerenes C60/C70 have been compared. Characteristic features of the bounded water have been shown to correlate with a decrease of aqueous dispersions stability to aggregation. 

Figure 7-11. Top of the valence band of the hydrated fullerene. The range of -1.67 to -0.97 eV, the lone pairs of water and the LUMO are represented from the left to the right. The dashed line represents the Fermi level ( p)...

Experiments on the radiation-induced reduction of the functionalized fullerene car-boxylate, C6oC(COO-)2, in aqueous media were unsuccessful, despite the use of a concentration range that should guarantee rapid fullerene reduction (e.g., as found for Ceo-y-CD, C6o-surfactant, and C6o-vesicle) [89, 90]. In particular, the absorption at ca 700 nm, attributable to the initially generated hydrated electron, remained... 

Compound 1/2 fullerene/fullerene (V, relative to SCE) (hydrated electrons) (m ... 

Buvari-Barcza and co-workers [77] showed, by comparing several com-plexing agents, that y-CD is the best host for solubilising C6q fullerene in a water environment. The interaction of C6q and y-CD forms a C6o-(y-CD)2 inclusion complex. The analytical data and solid state NMR indicated that the essentially 1 2 complex exists as two different forms. In the violet colored form, unhydrated C60 is included, while in the brownish one, C q is also hydrated. The inner diameter of the y-cyclodextrin is only 0.95 nm while the diameter of C6q is estimated to be 1.0 nm. Because of this dimensional difference, complete inclusion is inconceivable, but the secondary hydroxyls of the y-CD rims can be connected by hydrogen bonds and possibly mediated by water molecules (Fig. 29). 

The results of C solid state NMR experiments on dehydrated and hydrated C6Q-(y-CD)2 complexes prove, not only the general formation of [C6o-(y-CD)2] (H20)x species, but also the hydration of C6q itself, since the data measured for different carbon atoms of C q are definitely non-equivalent in the two cases. In the violet [C6o-(y-CD)2] (H20)x species, the water molecules seem to be connected only to the y-CD domain of the supramolecule, while in the hydrated brown complex, the included fullerene is also hydrated [C6o (H20)y(y-CD)2]-(H20)J. 

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