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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Ligand and Metal Based Multielectron Redox Chemistry of Cobalt Supported by Tetradentate Schiff Bases.
Journal of the American Chemical Society 2017 June 29
We have investigated the influence of bound cations on the reduction of cobalt complexes of redox active ligands and explored the reactivity of reduced species with CO2 . The one electron reduction of [CoII (R salophen)] with alkali metals (M = Li, Na, K) leads to either ligand-centered or metal-centered reduction depending on the alkali ion. It affords either the [CoI (R salophen)K] complexes or the [CoII 2 (bis-salophen)M2 ] (M = Li, Na) dimers that are present in solution in equilibrium with the respective [CoI (salophen)M] complexes. The two electron reduction of [CoII (OMe salophen)] results in both ligand centered and metal centered reduction affording the Co(I)-Co(II)-Co(I) [Co3 (tris-OMe salophen)Na6 (THF)6 ], 6 complex supported by a bridging deca-anionic tris-OMe salophen10- ligand where three OMe salophen units are connected by two C-C bonds. Removal of the Na ion from 6 leads to a redistribution of the electrons affording the complex [(Co(OMe salophen))2 Na][Na(cryptand)]3 , 7. The EPR spectrum of 7 suggests the presence of a Co(I) bound to a radical anionic ligand. Dissolution of 7 in pyridine leads to the isolation of [CoI 2 (bis-OMe salophen)Na2 Py4 ][Na(cryptand)]2 , 8. Complex 6 reacts with ambient CO2 leading to multiple CO2 reduction products. The product of CO2 addition to the OMe salophen ligand, [Co(OMe salophen-CO2 )Na]2 [Na(cryptand)]2 , 9, was isolated but CO3 2- formation in 53% yield was also detected. Thus, the electrons stored in the reversible C-C bonds may be used for the transformation of carbon dioxide.
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