Journal Article•
Facile preparation of the C60 monoanion in aprotic solvents
TL;DR: In this paper, a facile method of C - 60 monoanion preparation in various aprotic solvents is presented and interpreted in terms of the Nernst electrochemical equilibria.
Abstract: A facile method of C - 60 monoanion preparation in various aprotic solvents is presented and interpreted in terms of the Nernst electrochemical equilibria. The method consists of reduction of C - 60 with mercury in the presence of tetraalkylammonium halide. The C - 60 radical product, containing traces of C - 60 , is detected and identified by electron spin resonance spectroscopy. The selectivity of the method is tuned by a proper selection of solvent, tetraalkylammonium halide, and its concentration
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TL;DR: It is proposed that a pseudorotation-induced electron spin relaxation process could be operating in the C60 monoanion radical in liquid solution, applicable for radicals with low-lying, thermally accessible excited electronic states.
Abstract: We report the results of our investigation on the electron spin relaxation mechanism of the monoanion of C60 fullerene in liquid solution. The solvent chosen was carbon disulfide, which is rather uncommon in EPR spectroscopy but proved very useful here because of its liquid state over a wide temperature range. The conditions for exclusive formation of the monoanion of C60 in CS2 were first determined using electrochemical measurements. Using these results, only the monoanion of C60 was prepared by chemical reduction using Hg2I2/Hg as the reducing agent. The EPR line width was measured over a wide temperature range of 120–290 K. The line widths show weak dependence on temperature, changing by a factor of only about 2, over this temperature range. We show that the observed temperature dependence does not obey the Kivelson–Orbach mechanism of electron spin relaxation in liquids, applicable for radicals with low-lying, thermally accessible excited electronic states. The observed temperature dependence can be ...
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TL;DR: It is proposed that a pseudorotation-induced electron spin relaxation process could be operating in the C60 monoanion radical in liquid solution, applicable for radicals with low-lying, thermally accessible excited electronic states.
Abstract: We report the results of our investigation on the electron spin relaxation mechanism of the monoanion of C60 fullerene in liquid solution. The solvent chosen was carbon disulfide, which is rather uncommon in EPR spectroscopy but proved very useful here because of its liquid state over a wide temperature range. The conditions for exclusive formation of the monoanion of C60 in CS2 were first determined using electrochemical measurements. Using these results, only the monoanion of C60 was prepared by chemical reduction using Hg2I2/Hg as the reducing agent. The EPR line width was measured over a wide temperature range of 120–290 K. The line widths show weak dependence on temperature, changing by a factor of only about 2, over this temperature range. We show that the observed temperature dependence does not obey the Kivelson–Orbach mechanism of electron spin relaxation in liquids, applicable for radicals with low-lying, thermally accessible excited electronic states. The observed temperature dependence can be ...
6 citations