CF2-functionalized trifluoromethylated fullerene C70(CF3)8(CF2): structure, electronic properties, and spontaneous oxidation at the bridgehead carbon atomsстатья
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Дата последнего поиска статьи во внешних источниках: 11 ноября 2019 г.
Аннотация:Thermally induced CF2 addition to Cs-C70(CF3)8 upon reaction with sodium chlorodifluoroacetate is found to proceed via the nucleophilic cyclopropanation pathway, possibly with a certain involvement of the alternative singlet carbene pathway. Of the two major isomers of C70(CF3)8(CF2) characterized by X-ray diffraction and spectroscopically, the less abundant one has a [6,6]-open structure while the more abundant product is a [5,6]-open isomer with highly
reactive bridgehead sites. Under ambient conditions, its rapid oxidation and hydration produce, respectively, C70(CF3)8[CF2](OH)2 and C70(CF3)8[CF2](OH)H where the -system is split in two disjoint caps and the HOMO–LUMO gap is considerably increased, as evidenced by the blue-shifted fluorescence.