Thum K, Friedrich A, Pahl J, Elsen H, Langer J, Harder S (2020)
Publication Type: Journal article
Publication year: 2020
The first intermolecular early main group metal-alkene complexes were isolated. This was enabled by using highly Lewis acidic Mg centers in the Lewis base-free cations ((BDI)-B-Me)Mg+ and ((BDI)-B-tBu)Mg+ with B(C6F5)(4)(-) counterions ((BDI)-B-Me=CH[C(CH3)N(DIPP)](2), (BDI)-B-tBu=CH[C(tBu)N(DIPP)](2), DIPP=2,6-diisopropylphenyl). Coordination complexes with various mono- and bis-alkene ligands, typically used in transition metal chemistry, were structurally characterized for 1,3-divinyltetramethyldisiloxane, 1,5-cyclooctadiene, cyclooctene, 1,3,5-cycloheptatriene, 2,3-dimethylbuta-1,3-diene, and 2-ethyl-1-butene. In all cases, asymmetric Mg-alkene bonding with a short and a long Mg-C bond is observed. This asymmetry is most extreme for Mg-(H2C=CEt2) bonding. In bromobenzene solution, the Mg-alkene complexes are either dissociated or in a dissociation equilibrium. A DFT study and AIM analysis showed that the C=C bonds hardly change on coordination and there is very little alkene -> Mg electron transfer. The Mg-alkene bonds are mainly electrostatic and should be described as Mg2+ ion-induced dipole interactions.
APA:
Thum, K., Friedrich, A., Pahl, J., Elsen, H., Langer, J., & Harder, S. (2020). Unsupported Mg-Alkene Bonding. Chemistry - A European Journal. https://doi.org/10.1002/chem.202004716
MLA:
Thum, Katharina, et al. "Unsupported Mg-Alkene Bonding." Chemistry - A European Journal (2020).
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