Fullerene hydrogen molecule

We give an estimation of the carbon fraction locked in these molecules. We discuss the rotation rates and electric dipole emission of hydrogenated icosahedral fullerenes in various phases of the interstellar medium. These molecules could be the carriers of the anomalous microwave emission detected by Watson et al. (Astrophys. J. 624 L89,2005) in the Perseus molecular complex and Cassasus et al. (2006) in the dark cloud LDN 1622. Hydrogenated forms of fullerenes may account for the dust-correlated microwave emission detected in our Galaxy by Cosmic Microwave Background experiments. 

The hydrogenated C70 fullerenes C70H38 and C70D38 have been photolyzed at 254 nm under Ar or He flow. The photolysis rate constant have been measured k = 1.54 x 10-3 s 1 for C70H38 while the photolysis of C70D3g occurs at a rate of 1.17 x 10-3 s-1. A remarkable isotope effect in the photolysis of the two molecules has been... 

Further we studied ability of chemical hydrogen adsorption on a SWCNT surface by hydrogen molecule dissociation to atoms. With the help of LDA calculations it was found that energy of thermal dissociation of H2 molecule changed insignificantly at molecule movement to SWCNT or fullerene surface. This energy had a value about 6 eV. Therefore the probability of hydrogen chemisorption on SWCNT surface is very low at common temperatures without a catalyst influence. 

The process of hydride formation in the fuUerites consists of two steps saturation of the fullerite lattice with mobile hydrogen and the hydrogenation of fullerene molecules by excess mobile hydrogen. There are various methods for... 

One may use such relations to consider nontrivial experimental isotopic shifts [50] in the spectra of confined hydrogen molecules in fullerene cavities, as was done in [51] to analyze the results of numerical experiments. 

For pristine Geo, insertion of a helium atom ( He) required drastic conditions such as 650 °C and 3000 atm to give He C6o in an incorporation rate of 0.1% [58, 84). The incorporation was improved to 1% when Cso vvas pre-treated with KCN the reason for this is as yet unknown [85]. In contrast, theoretical calculations showed that insertion of a helium atom or a hydrogen molecule into open-cage fullerene 65 would take place under milder conditions such as at 124 or 397 °C for helium or hydrogen, respectively (Scheme 9.35) [59]. Actually, such insertion into 65, which was obtained in a similar maimer as 41, was achieved for the first time in 2001 by Rubin and coworkers [59]. The treatment of 65 as a crystalline powder with He (288-305 °G, ca. 475 atm, 7.5 h) gave the He-encapsulating molecule, He 65, in 1.5% yield. The NMR chemical shift of the He incorporated in 65 appeared at AS = —10.10 ppm relative to the free dissolved He gas. The He atom slowly escaped when He 65 was heated above 80 °C in a solution of... 

Ceo and higher fullerenes are distinguished from other allotropes of carbon, diamond and graphite, in that they exist as discrete molecules. The spherical or ellipsoidal nature of the monotropes opens up the possibility of intriguing new areas of chemistry. Here we are only interested in the hydrogen (or muonium) adducts, although this study has important implications to the very vigorous and extensive research in fullerene chemistry. 

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