Purification of Fullerene by using of Inclusion Compouns and Function of Their Inclusion Complexes

为了找到能在溶液中与[60]富勒烯相互作用的杯[n]芳烃，我们用光谱方法筛选了许多不同的杯[n]芳烃。我们最终发现了这三种杯[n]芳烃（对叔丁基杯[5]芳烃、对叔丁基杯[6]芳烃和对叔丁基同半杯[3]芳烃）在溶液中也能接受[60]富勒烯。它们通常具有锥形构象和苯环倾角，适合于[60]富勒烯包合。此外，还发现不能与[60]富勒烯相互作用的杯[n]芳基酯衍生物在某些特定金属阳离子的存在下成为优秀的[60]富勒烯受体。这归因于金属诱导的预组织锥形杯[n]芳基酯的构象变化。这种现象是一种正变构，这是富勒烯化学中的第一个例子。我们相信这些发现将为新的富勒烯-杯芳烃共轭化学打开一扇门。

In order to find calix [n] arenes which can interact with [60] fullerene in solution we have screened a number of different calix [n] arenes by spectroscopic methods. We eventually discovered such three calix [n] arenes (p-tert-butylcalix [5] arene, p-tert-butylcalix [6] arene, and ptert-butylhomooxacalix [3] arene) 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 [n] aryl 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 preorganeze 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 [n] arene conjugate chemistry.