Ligand redistribution hinders preparation of a nickel(II)-hydroxo
CANADIAN JOURNAL OF CHEMISTRY(2024)
Abstract
The synthesis is demonstrated for a heteroleptic Ni(II) complex, with a tridentate ligand bearing N -heterocyclic carbene (NHC), aryloxide, and picolyl donor groups. The compound was reacted with a variety of hydroxide sources, several of which resulted in complex mixtures. Reaction with [NH4]OH affords a bis-ligated nickel compound, in which the ligands are each bound in a bidentate fashion through the NHC and aryloxide donor groups. A desired nickel(II)-hydroxo product was not observed. DFT studies suggest that ligand redistribution is thermodynamically preferred over stabilization of a Ni-hydroxo in either a monomeric or dimeric form.
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Key words
hemilabile ligand,N-heterocyclic carbene,hydroxide ligand,nickel
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