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Synthesis and Characterization of Cp*Be-F-Al(O RF)3.

Authors :: Himmel, Daniel
Scherer, Harald
Kratzert, Daniel
Krossing, Ingo
Source :: Zeitschrift für Anorganische und Allgemeine Chemie; Mar2015, Vol. 641 Issue 3/4, p655-659, 5p
Publication Year :: 2015
Abstract: The reaction of Ag[Al(O R<superscript>F</superscript>)<subscript>4</subscript>] [ R<superscript>F</superscript> = C(CF<subscript>3</subscript>)<subscript>3</subscript>] with Cp*Be-Br was investigated. With the less basic CH<subscript>2</subscript>Cl<subscript>2</subscript> as solvent, redox chemistry prevailed, elemental silver and the pentamethylcyclopentenyl cation (Cp*H<subscript>2</subscript><superscript>+</superscript>) formed. However, upon changing to the more π-basic solvents fluorobenzene and o-difluorobenzene, the silver metathesis reaction went smooth and produced intermediately the [Cp*Be]<superscript>+</superscript> cation and AgBr. However, the very strong Lewis acid [Cp*Be]<superscript>+</superscript> activated one of the 36 equivalent C-F bonds of the [Al(O R<superscript>F</superscript>)<subscript>4</subscript>]<superscript>-</superscript> anion and finally formed two stable crystalline compounds containing the Cp*Be-F-Al(O R<superscript>F</superscript>)<subscript>3</subscript> molecule, which includes a [F-Al(O R<superscript>F</superscript>)<subscript>3</subscript>]<superscript>-</superscript> anion coordinated to the [Cp*Be]<superscript>+</superscript> cation. Cp*Be-F-Al(O R<superscript>F</superscript>)<subscript>3</subscript> nevertheless includes some potential to provide [Cp*Be]<superscript>+</superscript> in polar solution. Its potential neutral or ionic fission was investigated by DFT calculations. [ABSTRACT FROM AUTHOR]