On the prerequisites for the formation of solution complexes from [60]fullerene and calix[n]arenes: A novel allosteric effect between [60]fullerene and metal cations in calix[n]aryl ester complexes
✍ Scribed by Atsushi Ikeda; Yoshio Suzuki; Makoto Yoshimura; Seiji Shinkai
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- French
- Weight
- 656 KB
- Volume
- 54
- Category
- Article
- ISSN
- 0040-4020
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✦ Synopsis
In order to find calix [n]arenes which can interact with fullerene in solution we have screened a number of different calix [n]arenes by spectroscopic methods. We eventually discovered such three calix[n]arenes (15.But.H, 16.But.H, and 23-But-H) which could accept [60]fullerene even in solution. They commonly possess a cone conformation and a benzene ring inclination suitable to [60]fullerene inclusion. Furthermore, it was found that calix[nlaryl ester derivatives, which cannot interact with [60]fullerene, become excellent [60]fullerene-acceptors in the presence of certain specific metal cations. This was attributed to a metal-induced conformational change to preorganize cone calix [n]aryl esters. This phenomenon is a sort of positive allosterism, which is the first example in fullerene chemistry. We believe that these findings will open a door to new fullerene-calix[nlarene conjugate chemistry.