Fullerene complexes chemical properties

In this chapter on chemically modified fullerenes, I will discuss only a few representative molecules which incorporate fullerenes, and focus attention on the best-characterized compounds. A comprehensive review of chemical reactions with fullerenes has just been published by Taylor and Walton.[Ta93] It is not appropriate here to attempt a synthesis of the emerging field of the chemical properties of the fullerenes. Covered elsewhere in this book are ioni-cally bonded fullerides, such as the superconductor KsCeo (Chapter IV) and endohedral complexes, in which various atoms are captured inside the hollow carbon shell (Chapter VI). 

ORGANOMETALLIC COMPLEXES OF FULLERENES VI. Physical Properties and Chemical Reactivity... 

The most reasonable explanation for the observed differences in fullerene behavior as a part of complex C60/PVP in chemical and biological systems is the fact that the complex itself is stable in the pure water media. Dissolution in the saline causes the formation of fullerene precipitate, which, naturally reveals the photodynamic properties. But a basic difference between water-soluble C60 complexes with organic compounds (PVP, y-CD, etc.) from other forms used for biological investigations is the low degree of fullerene molecules association... 

Abstract. A comparative investigation of Cgo fullerene solubility and donor force of alkyl derivatives of benzene has been performed. Based on the found correlation, which was determined by current methods, between C60 solubility and donor force of solvents, it has been concluded that the process of C60 dissolution in aromatic hydrocarbons is a process of intermolecular interaction combined with charge-transfer and formation of complexes of the donor-acceptor type. The agreement between a series of physical and chemical phenomena (factors, properties) observed in studies of C60 solubility and a number of existing criteria which allow the phenomena to be inteipreted as a manifestation of the charge-transfer interaction substantiates our conclusion. 

At present, it is still not known why the M C6o-type metallofullerenes behave quite differently from the conventional M C82 type fullerenes in terms, for example, of the solubility property. This may correlate to high reactivity of M C6o toward moisture and/or air M C6o can possibly form weak complexes to stabilize themselves only with pyridine or aniline through their nonbonding electrons. Another possible rationale is that the carbon cage structures of the M C6o so far produced somehow do not satisfy the IPR, which again leads to high chemical reactivity of the species. To fully imderstand "the M C6o mystery" future studies on structural and electronic properties of these elusive metallofullerenes are definitely needed. 

Owing to its remarkable properties nanodiamond suits very well to being part of composite materials. In particular it is the small particle size, the hardness, the large chemical inertness, its nontoxicity and the high refractive index that may beneficially complement the properties of the polymer matrix. The latter may be connected to the diamond particles either by covalent bonding or by noncovalent interaction. Numerous examples of noncovalently bound composites have been reported in the literature (Section 5.6.1). StiU the interaction with the matrix is by far more complex than discussed for the nanotubes and fullerenes. This is due to the more variable surface structure that features not only graphitized domains, but also a variety of polar and nonpolar functional groups. 

Lopez-Urias, R, Terrones, M., 8cTerrones, H. (2003). Electronic properties of giant fullerenes and complex graphitic nanostructures with novel morphologies. Chemical Physics Letters, 381, 683-690. 

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