An electrochemical study of cobalt-salen (N,N′-bis(salicylidene)ethylenediaminocobalt(II) in the oxidation of syringyl alcohol in acetonitrile

Abstract

The reactivity of cobalt(II) complexes with molecular oxygen is a heavily studied and extremely important catalytic system. These interactions result in the formation of metal-dioxygen adducts that are responsible for numerous cobalt-catalyzed oxidations. In the case of 4-coordinate cobalt salen [Co(salen)] complexes, the formation of catalytically active, mononuclear, superoxo adducts in the presence of a secondary, N-donor ligand has been demonstrated [Co(salen)pyr-O 2 ]. In batch reactions, these adducts are known to readily oxidize certain para-substituted phenolic compounds resulting in benzoquinones in high yield. Para-phenolic model compounds have been used to demonstrate the potential use of cobalt Schiff base complexes in the oxidation of lignin biomass. This work investigates the redox behavior of the Co(salen)pyr-O 2 adduct as a potential recyclable electrocatalyst. Using traditional electrochemical techniques, the activity of the Co(salen)pyr-O 2 adduct is evaluated as it applies to the oxidation of the substrate syringyl alcohol (4-(hydroxymethyl)-2,6-dimethoxy-phenol) in acetonitrile. Typical EC′ electrochemical behavior is reported showing a near linear relationship between substrate concentration and peak current density (J p ) up to 200 mV s −1 . Electrochemical titration of catalytic amounts of Co(salen) with pyridine in the presence of excess oxygen and substrate indicate that the one-electron oxidation of Co(salen)pyr-O 2 H is reversible up to 2:1 pyridine to cobalt. However EPR characterization of electrolysis experiments with Co(salen)pyr-O 2 in the presence of excess substrate show evidence for the deactivation of the catalyst system after two hours, indicating possible poor ligand stability or the occurrence of an inhibiting side reaction under reaction conditions.

Aerobic Oxidation Reactivity of Well-Defined Cobalt(II) and Cobalt(III) Aminophenol Complexes

“…Cobalt complexes are attractive catalysts for aerobic oxidation reactions because of their well-recognized ability to activate molecular oxygen (O 2 ). , Catalytic methods have been devised for the aerobic oxygenation of a variety of organic substrates including alkenes, phenols, amines, sulfides, and phosphines . To achieve efficient turnover, these reactions often rely on the inclusion of coreductants, such as aldehydes or silanes, or redox-active cofactors, such as N -hydroxyphthalimide (NHPI) or quinone .…”

Effects of State of Charge on the Physical Characteristics of V(IV)/V(V) Electrolytes and Membrane for the All Vanadium Flow Battery

“…These include catalysis [29,30], medicine [31] and biological systems [32,33]. Additionally, the methods employed in this article have applications in catalysis [34,35], dietary medicine [36], and materials applications such as smart glass [37], which exemplifies the broad utility of vanadium compounds and the methods discussed below.…”

Electrochemical routes for biomass conversion

“…Electrochemical oxidation is shown to be a powerful for functionalizing organic molecules, breaking down macromolecules, and deactivating biologic pathogens [6][7][8]. This is possible because the applied potential enables oxidative and radical mechanisms in water that otherwise would require the addition of stoichiometric amounts of strong oxidants, which could increase the cost, the chemical hazards and waste generated, and the resulting temperatures in the process.…”