Characterization and Reactivity of a Terminal Nickel(III)-oxygen Adduct

Overview

Journal Chemistry

Specialty Chemistry

Date 2015 Jan 24

PMID 25612563

Citations 10

Authors

Paolo Pirovano

Erik R Farquhar

Marcel Swart

Anthony J Fitzpatrick

Grace G Morgan

Aidan R McDonald

Affiliations

Soon will be listed here.

Abstract

High-valent terminal metal-oxygen adducts are hypothesized to be the potent oxidizing reactants in late transition metal oxidation catalysis. In particular, examples of high-valent terminal nickel-oxygen adducts are scarce, meaning there is a dearth in the understanding of such oxidants. A monoanionic Ni(II)-bicarbonate complex has been found to react in a 1:1 ratio with the one-electron oxidant tris(4-bromophenyl)ammoniumyl hexachloroantimonate, yielding a thermally unstable intermediate in high yield (ca. 95%). Electronic absorption, electronic paramagnetic resonance, and X-ray absorption spectroscopies and density functional theory calculations confirm its description as a low-spin (S = 1/2), square planar Ni(III)-oxygen adduct. This rare example of a high-valent terminal nickel-oxygen complex performs oxidations of organic substrates, including 2,6-di-tert-butylphenol and triphenylphosphine, which are indicative of hydrogen atom abstraction and oxygen atom transfer reactivity, respectively.

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