72905-16-9Relevant academic research and scientific papers
Kinetics and mechanism of oxygen atom abstraction from sulfenatocobalt(III) complexes by hydrated methyldioxorhenium(V)
Lahti, David W.,Espenson, James H.
, p. 5230 - 5234 (2008/10/08)
Cationic sulfenatocobalt(III) complexes, with the remaining ligands amines, are deoxygenated upon reaction with hydrated methyldioxorhenium(V). The reactions of (Am)5Co-S(O)R2+ yield the thiolato complexes (Am)5Co-SR2+ and methyltrioxorhenium(VII), MTO. A kinetic study of these reactions was carried out, using the known reaction between MTO and hypophosphorous acid to prepare the Re(V) reagent in solution. The second-order rate constants between (Am)5Co-S(O)R2+ and MeReO2(aq), after correction for protonation, fall in the range 47-455 L mol-1 s-1 in aqueous solution at 25.0 °C and 1.0 M ionic strength. In the analysis of the pH effects, allowance was made for the formation of the protonated species (Am)5Co-S(OH)R3+ at high [H3O+]. The values of pKa are in the range 0.49-0.96, as determined from fitting the rate-pH profiles.
