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- Title
Activation of Heteroallenes CO <sub>x</sub>S<sub>2- x</sub> ( x = 0-2): Experimental and Theoretical Evidence of the Synthetic Versatility of a Bulky Guanidinato Sm<sup>II</sup> Complex.
- Authors
Castro, Ludovic; Mills, David P.; Jones, Cameron; Maron, Laurent
- Abstract
A joint experimental/theoretical (DFT) study of the activation of heteroallenes CO xS2- 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.
- Subjects
SAMARIUM compounds; METAL complexes; CARBON monoxide; ALLENE; COVALENT bonds; THERMAL stability
- Publication
European Journal of Inorganic Chemistry, 2016, Vol 2016, Issue 6, p792
- ISSN
1434-1948
- Publication type
Article
- DOI
10.1002/ejic.201501346