Harnessing Electron Transfer from the Perchlorotriphenylmethide Anion to Y@C82(C2v) to Engineer an Endometallofullerene-Based Salt

6 pages, 5 figures, 1 schemeWe show that electron transfer from the perchlorotriphenylmethide anion (PTM−) to Y@C82(C2v) is an instantaneous process, suggesting potential applications for using PTM− to perform redox titrations of numerous endohedral metallofullerenes. The first representative of a Y@C82-based salt containing the complex cation was prepared by treating Y@C82(C2v) with the [K+([18]crown-6)]PTM− salt. The synthesis developed involves the use of the [K+([18]crown-6)]PTM− salt as a provider of both a complex cation and an electron-donating anion that is able to reduce Y@C82(C2v). For the first time, the molar absorption coefficients for neutral and anionic forms of the pure isomer of Y@C82(C2v) were determined in organic solvents with significantly different polarities.This work was supported in part by the Spanish Direcci ón General de Investigació n (DGI; project POMAs, CTQ2010-19501/BQU), the Generalitat de Catalunya (2009SGR00516), the bilateral CSICNFBR project 2008RU0073, the RFBR (09-03-91291-INIS-a and 13- 03-01291-a), the Presidium of the RAS (program no. 8), and the European project ERC StG 2012-306826 e-GAMES. E.L. thanks CIBER-BBN, an initiative funded by the VI National R&D&i Plan 2008-2011, Iniciativa Ingenio 2010, Consolider Program, CIBER Actions and financed by the Instituto de Salud Carlos III with assistance from the European Regional Development Fund.Peer reviewe