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| - Bimetallic Reactivity. One-site Addition Two-metal Oxidation Reactions Using a Di-Co(II)Complex of a Binucleating Ligand with 5- and 6-Coordinate Sites
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| - The preparation of an unsymmetrical binucleating ligand bearing a bridging oxadiazole ring flanked on one sideby three ligands and on the other by four ligands is described. When bound to two metals, the ligand formscomplexes where the metals are in 5- and 6-coordinate sites after the incorporation of an exogenous bridgingligand. A di-Co2+ complex of this ligand has been prepared containing a hydroxide bridge. The complex is readilyoxidized to the di-Co3+ state by outer sphere electron transfer with ferrocenium ions. Addition of Br2 or NO2+to the di-Co2+ complex leads to the rapid formation of the di-Co3+ bromo or nitro complexes, respectively. Theligand characteristics which allow for double oxidation with ferrocenium ions and for the one-site addition two-metal oxidations with Br2 and NO2+ are discussed in terms of mechanical coupling between the two metal sites.
- A di-Co(II) complex of the asymmetrical binucleating ligand (oxapyme) bearing 5- and 6-coordinate sites was prepared and characterized. It undergoes one-site addition two-metal oxidation reactions with the 2-electron oxidants PyNO2+ and Br2, yielding nitro and bromo di-Co(III) complexes.
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