Fullerene compounds

The noble-gas fullerene compounds have no chemical bond between tire gas atom aird tire carbon atoms, yet tlrey are also extremely stable, since tire gas atom simply camrot escape from tire fullerene cage. In tlris light, tire... 

Add the maleimide-Cgo derivative to the protein solution at 100X mole excess with stirring. The addition of detergent to the solution may increase the solubility of the fullerene compound. 

In two recent reports (Mroz et al., 2007b Tegos et al., 2005) we studied the photosensitizer properties of two series of three functionalized fullerene compounds, one series with polar diserinol groups (BF1-BF3), and a second series of three compounds with quaternary pyrrolidinium groups (BF4-BF6) (Fig. 4.5). The bis-substituted and tris-substituted fullerenes are actually mixtures of regioisomers of the same molecular formula due to reaction with different double bonds. We asked the question whether the photodynamic effects displayed by these compounds operated... 

Braun T, Buvari-Barcza A, Barcza L, Konkoly-Thege I, Fodor M, Migali B (1994) Mechanochemistry a novel approach to the synthesis of fullerene compounds. Water soluble Buckminster fullerene - gamma- cyclodextrin inclusion complexes via solid-solid reaction. Solid State Chem. 74 47-51. 

It is noted that, as previously mentioned, there is a rapidly growing interest in the superconductivity of inorganic fullerene compounds. 

Example Isotopic enrichment is a standard means to enhance the response of an analyte in nuclear magnetic resonance (NMR). Such measures gain importance if extremely low solubility is combined with a large number of carbons, as is often the case with [60]fullerene compounds. [19] The molecular ion signals, IVT, of Qo with natural isotopic abundance and of C-enriched Cgo are shown below (Fig. 3.11 for EI-MS of [60]fullerenes cf. Refs. [20-22]). From these mass spectra, the enrichment can be determined by use of Eq. 3.1. For Qo of natural isotopic abundance we obtain Mrceo = 60 x 12.0108 u = 720.65 u. Applying Eq. 

Gross, J.H. Giesa, S. Kratschmer, W. Negative-Ion Low-Temperature FAB-MS of Monomeric and Dimeric [60]Fullerene Compounds. Rapid Commun. Mass Spectrom. 1999,73,815-820. 

Silylmethylation of fullerenes can be achieved by Grignard reaction of Cjq with Me2Si(0 Pr)MgCl (Scheme 3.4). Two different types of silylmethylated 1,2-fullerene adducts are formed [8]. The use of different solvents leads either to the 1,2-product 12 or to the unprecedented 1,4-addition product 13. These compounds react easily with various alcohols or phenols, which makes silylmethylated fullerenes a versatile starting material for regioselectively defined fullerene compounds [10]. Some examples are shown in Scheme 3.4. 

A multicomponent approach for synthesizing ionic fullerene compounds Di Dn (fuUerene) is very effective in developing various functional and structural fullerene CT solids, including a- and re-type dimers of fullerenes and an ry-type... 

Cgo single molecules between electrodes fabricated by electromigration [103] to create single Cgo molecule transistors were measured at a temperature of 40 mK. The results showed the coexistence and competition of the effects of Coulomb repulsion, Kondo correlations and superconductivity [104]. The Kondo effect had been previously observed in similar devices [105]. Recently a SAM of a tricarboxylic acid fullerene derivative was used to fabricate a transistor. The SAM was created by allowing the fullerene compound to self assemble on top of an AI2O3 layer just above the aluminum drain electrode the source lead was created by... 

Fullerene compounds have been characterized by typical spectroscopic techniques including 13C NMR, IR, UV-vis, electrochemical methods, mass spectrometry (MS), and X-ray diffraction. Each of these methods is discussed here in relation to specific points arising from the... 

By far the most powerful tool for analysis of fullerene compounds is solution 13C NMR spectroscopy, as the number, positions, and relative intensities of resonances often provide unambiguous evidence for a particular structure. The molecular point group of about 300 fullerene compounds has been identified using 13C NMR spectroscopy. 

Photophysical investigations of C60 and its derivatives have revealed that [60]fullerene and l,2-dihydro[60]fullerene derivatives produce singlet oxygen in high quantum yields. Consequently, the fullerene compounds are used as photo-... 

Hirsch, A., Li, Q. Wudl, F. 1991 Globe-trotting hydrogens on the surface of the fullerene compound C60H6[N(CH2CH2)2O]6. Angew. Chem. Int. Edn Engl. 30, 1309-1310. 

Taylor, R. 19926 Will fullerene compounds C78X6 be readily formed J. chem. Soc. Perkin Trans. 2, 1667-1669. 

From the perspective of structural chemistry, the modes of bonding, coordination, and the bond parameters of a particular element in its allotropic modifications may be further extended to its compounds. Thus organic compounds can be conveniently divided into three families that originate from their prototypes aliphatic compounds from diamond, aromatic compounds from graphite, and fullerenic compounds from fullerenes. 

The derivatives of fullerenes are called fullerenic compounds, which are now mainly prepared from C60 and, to a lesser extent, from C70 and Cs4. 

Assink et al [ 1 ] have pointed out that fullerenes may provide an efficient way for gas storage. Usually gas C60 interstitial compounds are produced by hot pressing the fullerene solid (fullerite) at temperatures between 200 - 550°C and under gas pressures in the range 170-200 MPa for set periods from 12 to 60h. With this method Ar, Kr and Xe[2] as well as CO [3], C02 [4] and N20 [5] fullerene compounds were produced. 

Abstract. The work demonstrates a principle possibility to produce the films of fullerenes and fullerene-containing products from their solutions by the electrochemical method. Electrical properties of fullerene solutions have been studied. The proposed method can be used for the special-purpose application of fullerene-containing coatings and for synthesis of fullerene compounds with organic and inorganic substances. 

C6o fullerene is a new type of n-acceptors with a number of essential dissimilarities from another acceptor molecules large size, spherical form, unique electron structure, high symmetry and polarizability. These peculiarities introduce a certain specificity in donor-acceptor interactions in fullerene compounds. Fullerene is a rather weak acceptor. Adiabatic affinity for an electron in the solution is 2.1-2.2 eV [1]. One molecule of C(,o fullerene can accept to 12 electrons [1-4] and donate one electron [5], i.e. the charge on a C6o molecule can vary from +1 to -12. Polarizability of a C6o molecule is high (a 85 A3) and several times greater than that of other ji-acceptor molecules. Because of this, polarization Van der Waals forces are of essential importance in the formation of donor-acceptor complexes. 

The proposed technique can be also used for the synthesis of fullerene compounds with different organic and inorganic substances by the electrochemical method. 

With the discovery of Ceo and other fullerenes see Carbon Fullerenes), it was not long before investigations into the possible reactions of fullerenes and iridium complexes were undertaken. Quite a variety of exohedral iridium fullerene compounds have been characterized including complexes of... 

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