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Science. 2016 Aug 12;353(6300):678-82. doi: 10.1126/science.aaf6362.

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

Author information

1
Inorganic Chemistry, Institute of Chemistry and Biochemistry, Free University Berlin, 14195 Berlin, Germany. moritz.malischewski@fu-berlin.de karsten.meyer@fau.de.
2
Inorganic Chemistry, Department of Chemistry and Pharmacy, Friedrich-Alexander-University Erlangen-Nürnberg, 91058 Erlangen, Germany.
3
Inorganic Chemistry, Department of Chemistry and Pharmacy, Friedrich-Alexander-University Erlangen-Nürnberg, 91058 Erlangen, Germany. moritz.malischewski@fu-berlin.de karsten.meyer@fau.de.
4
Inorganic Chemistry, Institute of Chemistry and Biochemistry, Free University Berlin, 14195 Berlin, Germany.

Abstract

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 (57)Fe Mössbauer spectroscopy and superconducting quantum interference device magnetization studies reveal identical d-orbital splitting with an S = 1, (3)E ground state based on the 3d electronic configuration e2g (3)a1g (1) of all [Cp*2Fe](2+) salts.

PMID:
27516596
DOI:
10.1126/science.aaf6362
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