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Issue 29, 2010
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Lanthanide(II) complexes of a phosphine-borane-stabilised carbanion

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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]2Sm(THF) (5a) or [(Me3Si)2{Me2P(BH3)}C]2Sm(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]2Yb (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.

Graphical abstract: Lanthanide(ii) complexes of a phosphine-borane-stabilised carbanion

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The article was received on 25 Jan 2010, accepted on 04 May 2010 and first published on 17 May 2010

Article type: Paper
DOI: 10.1039/C001468K
Citation: Dalton Trans., 2010,39, 6705-6709
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    Lanthanide(II) complexes of a phosphine-borane-stabilised carbanion

    K. Izod, W. Clegg and R. W. Harrington, Dalton Trans., 2010, 39, 6705
    DOI: 10.1039/C001468K

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