Chen, Zheng, Fox, Judith M., Gale, Philip A., Pilgrim, Alexandra J., Beer, Paul D. and Rosseinsky, Matthew J.
Effects of calixarenes on the electrochemical reduction of buckminsterfullerene, C60
Journal of Electroanalytical Chemistry, 392, (1-2), . (doi:10.1016/0022-0728(95)04137-D).
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The electrochemical properties of fuUerenes [1-9] have been studied both in solution [10-19] and surface immobilised [20-23] states. Voltammetric [10-19] studies have shown for C60 and C70 in solution up to six successive reversible one-electron reductions. LUMO [4,8] and localised electron insertion models [4,7] have been proposed to account for these experimental findings. In this report we present preliminary cyclic and square wave (Osteryoung type ) voltammetric results which demonstrate for the first time the existence of interactions between C6o anions and p-tert-butylcalixarenes [25-32]. Examples of interactions between calixarenes and reduced fullerenes or fulleride anions have not yet appeared in the literature even though these anions are stable in solution [10-19] and the solid state [20-23]. Three studies concerning the nature of neutral fullerene-calixarene interactions have been reported [31-33]. Structure complementarity and the nature of the substituents on the calixarene have been found to play important roles in the formation of insoluble C60- calixarene complexes [31-32]. Atwood and co-workers have demonstrated CH3-fullerene interactions between p-tert-butylcalixarene and C6o . However, there is also evidence suggesting that calixarene-fullerene interactions occur with smaller calixarenes. For example, 2:1 complexation has been demonstrated between a calix arene and C6o or the larger C70 . A solid state t3C NMR study has shown an interaction between C60 and the aromatic units of a calixarene .
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