کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1315031 | 976000 | 2010 | 5 صفحه PDF | دانلود رایگان |
Anodic voltammetry and electrolysis of the metallocenes ferrocene, ruthenocene, and nickelocene have been studied in dichloromethane containing two different fluorine-containing anions in the supporting electrolyte. The perfluoroalkoxyaluminate anion [Al(OC(CF3)3)4]− has very low nucleophilicity, as shown by its inertness towards the strong electrophile [RuCp2]+ and by computation of its electrostatic potential in comparison to other frequently used electrolyte anions. The low ion-pairing ability of this anion was shown by the large spread in E1/2 potentials (ΔE1/2 = 769 mV) for the two one-electron oxidations of bis(fulvalene)dinickel. The hexafluoroarsenate anion [AsF6]−, on the other hand, reacts rapidly with the ruthenocenium ion and is much more strongly ion-pairing towards oxidized bis(fulvalene)dinickel (ΔE1/2 = 492 mV). In terms of applications of these two anions to the anodic oxidation of organometallic sandwich complexes, the behavior of [Al(OC(CF3)3)4]− is similar to that of other weakly-coordinating anions such as [B(C6F5)4]−, whereas that of [AsF6]− is similar to the more traditional electrolyte anions such as [PF6]− and [BF4]−. Additionally, the synthesis and crystal structure of [Cp2Fe][Al(OC(CF3)3)4] are reported.
The anodic electrochemical behavior of several monometallic and dimetallic sandwich complexes was studied in dichloromethane containing either [Al(OC(CF3)3)4]− or [AsF6]− as the supporting electrolyte anion. The former behaves as a weakly-coordinating, non-nucleophilic anion towards reactive organometallic cation radicals, whereas the latter behaves more like a traditional small anion.Figure optionsDownload as PowerPoint slide
Journal: Journal of Fluorine Chemistry - Volume 131, Issue 11, November 2010, Pages 1091–1095