Publication

Stabilization of molecular LiF and LiFHF inside metallamacrocyclic hosts

2002
Journal Articles

Abstract

Complexes of molecular LiF and LiFHF were synthesized using the metallamacrocyclic receptors (cymene)Ru-(C5H3NO2) (1), (CpRh)-Rh-*(C5H3NO2) (2), and (CpIr)-Ir-*(C5H3NO2) (3). LiBF4 complexes of 1-3 were prepared and subsequently treated with F- or FHF- to give the desired products in an anion-exchange reaction. All complexes were characterized by multinuclear NMR spectroscopy (H-1, C-13, F-19, Li-7). Strong scalar coupling between Li-7 and F-19 is observed for the LiF and the LiFHF complexes ((1)J(LiF) = 91-103 Hz). The LiFHF adduct of 1 displays fluxional behavior with fast exchange of the two fluorine atoms. The structures of the complexes 1.LiBF4, 2.LiBF4, 1.LiF, 2-LiF, 1-LiFHF, and 3-LiFHF were determined by single-crystal X-ray analysis. Li-F bond lengths between 1.77 and 1.81 Angstrom were found. The LiFHF complexes show a hydrogen difluoride anion coordinated in a bent fashion via one fluorine atom to the lithium ion.

Official source

https://infoscience.epfl.ch/entities/publication/23f013f0-4e8d-4e6a-b2f0-c22bf6e99258

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2002
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/23f013f0-4e8d-4e6a-b2f0-c22bf6e99258

About this result

Related concepts (31)

Fluorine

Fluorine is a chemical element with the symbol F and atomic number 9. It is the lightest halogen and exists at standard conditions as a highly toxic, pale yellow diatomic gas. As the most electronegative reactive element, it is extremely reactive, as it reacts with all other elements except for the light inert gases. Among the elements, fluorine ranks 24th in universal abundance and 13th in terrestrial abundance.

Carbon–fluorine bond

The carbon–fluorine bond is a polar covalent bond between carbon and fluorine that is a component of all organofluorine compounds. It is one of the strongest single bonds in chemistry (after the B–F single bond, Si–F single bond, and H–F single bond), and relatively short, due to its partial ionic character. The bond also strengthens and shortens as more fluorines are added to the same carbon on a chemical compound. As such, fluoroalkanes like tetrafluoromethane (carbon tetrafluoride) are some of the most unreactive organic compounds.

Lithium-ion battery

A lithium-ion or Li-ion battery is a type of rechargeable battery which uses the reversible reduction of lithium ions to store energy. The negative electrode of a conventional lithium-ion cell is typically graphite, a form of carbon. This negative electrode is sometimes called the anode as it acts as an anode during discharge. The positive electrode is typically a metal oxide; the positive electrode is sometimes called the cathode as it acts as a cathode during discharge.

Related publications (3)

Stabilization of molecular LiF and LiFHF inside metallamacrocyclic hosts

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