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Nickel-Alkyl Complexes with a Reactive PNC-Pincer Ligand.

European journal of inorganic chemistry (2018-06-26)
Linda S Jongbloed, Nicolas Vogt, Aaron Sandleben, Bas de Bruin, Axel Klein, Jarl Ivar van der Vlugt
ABSTRACT

Based on previous work related to the design and application of rigid tridentate phosphine-pyridine-phenyl coordination offered by a PNC-pincer ligand upon cyclometalation to nickel, the synthesis, spectroscopic and solid state characterization and redox-reactivity of two NiII(PNC) complexes featuring either a methyl (2CH3 ) or CF3 co-ligand (2CF3 ) are described. One-electron oxidation is proposed to furnish C-C reductive elimination, as deduced from a combined chemical, electrochemical, spectroscopic and computational study. One-electron reduction results in a ligand-centered radical anion, as supported by electrochemistry, UV spectroelectrochemistry, EPR spectroscopy, and DFT calculations. This further attenuates the breadth of chemical reactivity offered by such PNC-pincer ligands.

MATERIALS
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Product Description

Sigma-Aldrich
2-Phenylpyridine, 98%