Fullerene application

The Fullerenes form particularly strong complexes with porphyrins as exemplified by the X-ray crystal structure of the covalent Fullerene-porphyrin conjugate 15.8 (Figure 15.29).48 This property allows fullerenes and porphyrins to form extended supramolecular arrays (even when not covalently linked) and has been used to engineer host-guest complexes in which a Fullerene is sandwiched in between a pair of porphyrins, and ordered arrays involving interleaved porphyrins and Fullerenes. Applications include the use of porphyrin solid phases in the chromatographic separation of Fullerenes and potential applications in porous frameworks and photovoltaic devices.49... 

Let us first consider adsorption in relation with fullerene applications in liquid chromatography (LC) and high-performance liquid chromatography (HPLC). Saito et al. [105] first used a chemically bonded C o ilica as a stationary phase for LC, and found it to have a selectivity different from that of more traditional... 

Figure 6.22. Examples of fullerene applications. Shown are (a) Gd C o—[OH],t(a 27) and Gd Cso—[C(COOH)2]io used as MRI contrast agents, (b) the ionic unit cell for the superconductive alkali metal fulleride CS (RbyC6o/ and (c) the conjugate structure of C o covalently bound to the lung cancer drug Paclitaxel. ...

Jensen A W, Wilson S R and Schuster D I 1996 Biological applications of fullerenes—a review Bioorg. Med. Chem. 4 767-79... 

Imahori H and Sakata Y 1997 Donor-linked fullerenes photoinduced electron transfer and its potential application Adv. Mater. 9 537-46... 

Prato M 1997 [60]fullerene chemistry for materials science applications J. Mater. Chem. 7 1097-109... 

Jensen A W, Wilson S R and Schuster D I 1996 Biological applications of fuiierenes—a review Bioorg. Med. Chem. 4 767-79 Martii n N, Sanchez L, lllescas B and Perez I 1998 Cgg-based electroactive organofullerenes Chem. Rev. 98 2527 Prato M 1997 [60]fullerene chemistry for materials science applications J. Mater. Chem. 7 1097-109... 

Thus far the importance of carbon cluster chemistry has been in the discovery of new knowl edge Many scientists feel that the earliest industrial applications of the fullerenes will be based on their novel electrical properties Buckminsterfullerene is an insulator but has a high electron affinity and is a superconductor in its reduced form Nanotubes have aroused a great deal of interest for their electrical properties and as potential sources of carbon fibers of great strength... 

There are many applications for diamonds and related materials, e.g., diamondlike carbon films, and there are potential applications for Fullerenes and carbon nanotubes that have not yet been realised. However, the great majority of engineering carbons, including most of those described in this book, have graphitic microstructures or disordered graphitic microstructures. Also, most engineering carbon materials are derived firom organic precursors by heat-treatment in inert atmospheres (carbonisation). A selection of technically-... 

The structure-property relations of fullerenes, fullerene-derived solids, and carbon nanotubes are reviewed in the context of advanced technologies for carbon-hased materials. The synthesis, structure and electronic properties of fullerene solids are then considered, and modifications to their structure and properties through doping with various charge transfer agents are reviewed. Brief comments are included on potential applications of this unique family of new materials. 

Another interesting applications area for fullerenes is based on materials that can be fabricated using fullerene-doped polymers. Polyvinylcarbazole (PVK) and other selected polymers, such as poly(paraphcnylene-vinylene) (PPV) and phenylmethylpolysilane (PMPS), doped with a mixture of Cgo and C70 have been reported to exhibit exceptionally good photoconductive properties [206, 207, 208] which may lead to the development of future polymeric photoconductive materials. Small concentrations of fullerenes (e.g., by weight) lead to charge transfer of the photo-excited electrons in the polymer to the fullerenes, thereby promoting the conduction of mobile holes in the polymer [209]. Fullerene-doped polymers also have significant potential for use in applications, such as photo-diodes, photo-voltaic devices and as photo-refractive materials. 

In other materials synthesis applications, the utilization of the strong bonding of fullerenes to clean silicon surfaces, has led to the application of a monolayer... 

As further research on fullerenes and carbon nanotubes materials is carried out, it is expected, because of the extreme properties exhibited by these carbon-based materials, that other interesting physics and chemistry will be discovered, and that promising applications will be found for fullerenes, carbon nanotubes and related materials. 

The hoped-for applications of fullerenes have not materialised as yet. A cartoon published in America soon after the discovery shows a hapless hero sinking into a vat full of buckyballs (another name for fullerenes) with their very low friction. It is not known how the hero managed to escape... 

The low solubility of fullerene (Ceo) in common organic solvents such as THE, MeCN and DCM interferes with its functionalization, which is a key step for its synthetic applications. Solid state photochemistry is a powerful strategy for overcoming this difficulty. Thus a 1 1 mixture of Cgo and 9-methylanthra-cene (Equation 4.10, R = Me) exposed to a high-pressure mercury lamp gives the adduct 72 (R = Me) with 68% conversion [51]. No 9-methylanthracene dimers were detected. Anthracene does not react with Ceo under these conditions this has been correlated to its ionization potential which is lower than that of the 9-methyl derivative. This suggests that the Diels-Alder reaction proceeds via photo-induced electron transfer from 9-methylanthracene to the triplet excited state of Ceo-... 

Almena I., Carrillo J. R., De la Cruz P., Diaz-Ortiz A., Gomez-Escalonilla M. J., De la Hoz A., Langa F., Prieto P., Sanchez-Migallon A. Application of Microwave Irradiation to Heterocyclic Chemistry Targets Heterocyclic Systems-Chemistry and Properties 1998 2 281-308, Eds. Attanasi O. A. and Spinelli D., Pb. Soc. Chim. Ital. Keywords Diels-Alder reactions, [60]-fullerene... 

In general, nanotechnology MBBs are distinguished for their unique properties. They include, for example, graphite, fullerene molecules made of various numbers of carbon atoms (C60, C70, C76, C240, etc.), carbon nanotubes, nanowires, nanocrystals, amino acids, and diamondoids [97]. All these molecular building blocks are candidates for various applications in nanotechnology. 

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