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Isolation and structural and electronic characterization of salts of the decamethylferrocene dication

M. Malischewski, M. Adelhardt, J. Sutter, K. Meyer, K. Seppelt – 2016

Ferrocene and its decamethyl derivative [Cp*2Fe] are the most common standards for nonaqueous electrochemical investigations because of their well-defined and only mildly solvent-dependent reversible Fe(II)/Fe(III) redox couple. Higher oxidation states have only rarely been studied. We report the isolation and crystallographic and spectroscopic characterization of surprisingly stable Fe(IV) salts of the [Cp*2Fe]2+ dication, produced by oxidation of [Cp*2Fe] with AsF5, SbF5, or ReF6 in neat sulfur dioxide as well as [XeF](Sb2F11) in neat hydrogen fluoride. The Sb2F11– salt exhibits a metallocene with the expected mutually parallel arrangements of the Cp* rings, whereas the As2F11–, AsF6–, SbF6–, and ReF6– salts manifest tilt angles ranging from 4° to 17°. Both 57Fe Mössbauer spectroscopy and superconducting quantum interference device magnetization studies reveal identical d-orbital splitting with an S = 1, 3E ground state based on the 3d electronic configuration e2g3a1g1 of all [Cp*2Fe]2+ salts.

Titel
Isolation and structural and electronic characterization of salts of the decamethylferrocene dication
Verfasser
M. Malischewski, M. Adelhardt, J. Sutter, K. Meyer, K. Seppelt
Verlag
AAAS
Datum
2016
Zitierweise
Science, 2016, 353, 678-682
Art
Text