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Lanthanide(II) complexes of a phosphine-borane-stabilised carbanion

Lookup NU author(s): Dr Keith Izod, Professor William Clegg, Dr Ross Harrington

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Abstract

The reaction between two equivalents of the potassium salt [(Me3Si)(2){Me2P(BH3)}C] K (4) and SmI2(THF)(2) in refluxing THF yields the dialkylsamarium(II) compounds [(Me3Si)(2){Me2P(BH3)}C](2)Sm(THF) (5a) or [(Me3Si)(2){Me2P(BH3)}C](2)Sm(THF)(3) (5b), depending on the crystallisation conditions, in good yield as air-and moisture-sensitive crystalline solids. X-ray crystallography shows that, whereas both alkyl ligands chelate the samarium(II) ion in 5a, in 5b one alkyl ligand chelates the metal centre and one binds the metal only through its borane hydrogen atoms. The reaction between YbI2 and two equivalents of 4 in refluxing benzene yields the solvent-free dialkylytterbium(II) compound [(Me3Si)(2){Me2P(BH3)}C](2)Yb (8). In contrast to 5a and 5b, compound 8 reacts rapidly with THF to give the free phosphine-borane (Me3Si)(2){Me2P(BH3)} CH as the only identifiable product.

Publication metadata

Author(s): Izod K, Clegg W, Harrington RW

Publication type: Article

Publication status: Published

Journal: Dalton Transactions

Year: 2010

Volume: 39

Issue: 29

Pages: 6705-6709

ISSN (print): 1477-9226

ISSN (electronic): 1477-9234

Publisher: Royal Society of Chemistry

URL: http://dx.doi.org/10.1039/c001468k

DOI: 10.1039/c001468k

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