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. 2024 May 14;30(27):e202400681.
doi: 10.1002/chem.202400681. Epub 2024 Apr 8.

Synthesis and Reactivity of Discrete Europium(II) Hydride Complexes

Georgia M Richardson  1 , Matthew J Evans  2 , Thayalan Rajeshkumar  3 , Jordan A J McCone  1 , Scott A Cameron  1 , Laurent Maron  3 , Cameron Jones  2 , Mathew D Anker  1
Affiliations

Synthesis and Reactivity of Discrete Europium(II) Hydride Complexes

Georgia M Richardson et al. Chemistry. .

Abstract

The bulky β-diketiminate ligand frameworks [BDIDCHP]- and [BDIDipp/Ar]- (BDI=[HC{C(Me)2N-Dipp/Ar}2]- (Dipp=2,6-diisopropylphenyl (Dipp); Ar=2,6-dicyclohexylphyenyl (DCHP) or 2,4,6-tricyclohexylphyenyl (TCHP)) have been developed for the kinetic stabilisation of the first europium (II) hydride complexes, [(BDIDCHP)Eu(μ-H)]2, [(BDIDipp/DCHP)Eu(μ-H)]2 and [(BDIDipp/TCHP)Eu(μ-H)]2, respectively. These complexes represent the first step beyond the current lanthanide(II) hydrides that are all based on ytterbium. Tuning the steric profile of β-diketiminate ligands from a symmetrical to unsymmetrical disposition, enhanced solubility and stability in the solution-state. This provides the first opportunity to study the structure and bonding of these novel Eu(II) hydride complexes crystallographically, spectroscopically and computationally, with their preliminary reactivity investigated.

Keywords: europium; hydride; lanthanide (II) hydrides; unsymmetric β-diketiminates; β-diketiminates.

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