Mechanism of Reduction of Cymantrene (Tricarbonyl η5-Cyclopentadienylmanganese) and Its Methyl Carboximidate Derivative
The mechanisms of electrochemical reduction of cymantrene, [Mn(CO)3(η5-Cp)], and its ring-substituted methyl carboximidate derivative, [Mn(CO)3(η5-C5H4C(NH)OMe)], were studied by voltammetry, in situ IR spectroelectrochemistry and preparative electrolysis. The product of one-electron reduction undergoes further chemical reactions. Comparison of the data obtained under atmosphere of argon and that of carbon monoxide leads to the conclusion that a ligand substitution reaction and dimerization participate in the overall reaction sequence. FTIR spectra recorded in situ suggest product dimerization, the formation of [Mn(CO)5]- and, to a lesser extent, other unstable species. The dimer formation was not observed in the course of the reduction of the carboximidate.
Kinetics of Multidentate Ligand Substitution Reaction. III. Substitution Reactions of BT with Cobalt(II) and Nickel(II) Chelates ofN-(2-Hydroxyethyl)-ethylenediamine-N,N′,N′-triacetic Acid and 2,2′-Ethylenedioxybis[ethyliminodi(acetic acid)]