Simultaneous fluoride binding to ferrocene-based heteronuclear bidentate lewis acids

Ramez Boshra, Kristinen Venkatasubbaiah, Ami Doshi, Roger A. Lalancette, Lazaros Kakalis, Frieder Jäkle

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Abstract

A series of μ2-fluoro-bridged heteronuclear bidentate Lewis acid complexes [K(18-crown-6)THF]+ [Fc(BMeF)(SnMe2Cl)F] - (1-2F), [K(18-crown-6)THF]+ [Fc(BMeF)(SnMe 2F)F]- (1-3F), [K(18-crown-6)THF]+ [Fc(BMePh)(SnMe2Cl)F]- (2-F), and [K(18-crown-6)THF] + [Fc(BMePh)(SnMe2F)F]- (2-2F) (Fc = 1,2-ferrocenediyl) was prepared. Compounds 2-F and 2-2F were obtained as a mixture of diastereomers, which arise due to the generation of a stereocenter at boron in addition to their inherent planar chirality. All compounds have been studied in the solid state by single-crystal X-ray diffraction analysis and by multinuclear NMR spectroscopy in solution. As a result of bridging-fluoride interactions, tetrahedral boron and distorted trigonal-bipyramidal tin centers are observed. Comparison with the corresponding monofunctional ferrocenylborates further supports the bridging nature of the fluoride anion. Two-dimensional exchange spectroscopy 19F NMR studies provide evidence for facile intermolecular and intramolecular fluorine exchange processes. All complexes display reversible one-electron oxidation events at lower potentials than those of the tricoordinate ferrocenylborane precursors, which is typical of ferrocenylborate complexes.

Original languageEnglish (US)
Pages (from-to)10174-10186
Number of pages13
JournalInorganic Chemistry
Volume46
Issue number24
DOIs
StatePublished - Nov 26 2007

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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