Activation of heteroallenes COxS2-x (x = 0-2): experimental and theoretical evidence of the synthetic versatility of a bulky guanidinato SmII somplex

Ludovic Castro, David P. Mills, Cameron Jones, Laurent Maron

Research output: Contribution to journalArticleResearchpeer-review

10 Citations (Scopus)


A joint experimental/theoretical (DFT) study of the activation of heteroallenes COxS2-x (x = 0-2) by [Sm(Giso)2] {Giso- = [(ArN)2CNCy2]-, Cy = cyclohexyl, Ar = 2,6-diisopropylphenyl} is reported. All heteroallenes are reduced in a different manner. Indeed, while activation of CS2 yields a bimetallic CS2 coupled product through C-S bond formation, CO2 forms an oxalate complex through C-C bond formation. This subsequently undergoes CO2 insertion into one of its Sm-N bonds. Finally, COS activation is predicted to yield a dithiocarbonate complex, through the formation of an intermediate sulfido complex [(Giso)2Sm(μ-S)Sm(Giso)2]. Therefore, [Sm(Giso)2] is a very versatile reagent, since it is a rare example of a complex that allows formation of several activation products involving valence isoelectronic substrates. This is rationalized by DFT calculations, and the latter emphasizes both the lack of kinetic stability of CS vs. CO and the high thermodynamic stability of the oxalate.

Original languageEnglish
Pages (from-to)792-796
Number of pages5
JournalEuropean Journal of Inorganic Chemistry
Issue number6
Publication statusPublished - 1 Feb 2016


  • CO transformation
  • Density functional calculations
  • Heteroallenes
  • Lanthanides

Cite this