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Synthesis and Characterization of Heteroleptic Ni(II) Bipyridine Complexes Bearing Bis(N-heterocyclic carbene) Ligands
The synthesis and
characterization of four new NiÂ(II) bisÂ(NHC)
bipy complexes (bipy = 4, 4′-bipyridine, NHC = N-heterocyclic
carbene) are reported. These represent the first examples of the Ni<sup>II</sup>(NHC<sub>2</sub>) L<sub>2</sub> class of compounds, where
L is a two-electron-donor ligand. The introduction of a double propyl
bridged bis-NHC ligand (C<sup>Prop2</sup>C) imparts reversibility
to the electrochemistry of these complexes. The electrochemical response
includes two reductions, the first believed to be bipy ligand based,
bipy<sup>0/–</sup>, and the second metal based. The unusual
ligand arrangements in these complexes result in electronic structures
in which both the HOMOs and LUMOs are ligand-based, as determined
by DFT analysis of all four compounds