Synthesis of Stable Pentacoordinate Silicon(IV)\textendashNHC Adducts: An Entry to Anionic N-Heterocyclic Carbene Ligands - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Organometallics Année : 2018

Synthesis of Stable Pentacoordinate Silicon(IV)\textendashNHC Adducts: An Entry to Anionic N-Heterocyclic Carbene Ligands

Résumé

This work features the previously undescribed interactions of Martin's spirosilane with different types of N-heterocyclic carbenes (NHCs). The level of interaction proved to be strongly dependent on the size of the Lewis base and could vary from the formation of isolable classical Lewis adducts to abnormal Lewis adducts, as evidenced by X-ray diffraction structure analyses and NMR studies. It has been found that abnormal adducts could be used as precursors for the synthesis of anionic NHCs bearing a weakly coordinating siliconate component. Complexation of these new types of carbenes with gold(I) and copper(I) has been efficiently accomplished. DFT calculations performed on the siliconate-based anionic NHC ligands revealed a high-lying HOMO and therefore a strong σ-donor character.

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Chimie
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Dates et versions

hal-02889357 , version 1 (03-07-2020)

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Fabrizio Medici, Geoffrey Gontard, Etienne Derat, Gilles Lemière, Louis Fensterbank. Synthesis of Stable Pentacoordinate Silicon(IV)\textendashNHC Adducts: An Entry to Anionic N-Heterocyclic Carbene Ligands. Organometallics, 2018, 37 (4), pp.517--520. ⟨10.1021/acs.organomet.7b00838⟩. ⟨hal-02889357⟩
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