Abstract
[(Co(phen) 3][(Sb( R, R)-tartrate) 2] · 8H 2O, C 44H 44N 6O 20CoSb 2, crystallizes in the trigonal space group P3 221 (No. 154) with Z = 3, a = 18.861(4), c = 11.917(3) Å and R = 0.035 for 1800 reflections. The structure has been determined and the absolute configuration of (+) 589-[Co(phen) 3](ClO 4) 3 · 2H 2O formed from the compound by Cl 2 oxidation is confirmed as Λ. Reduction of [Co(phen) 3] 3+ by [Co(edta) 2− is outer-sphere with a second-order rate constant of 9.6 x 10 −3 M −1 s −1 at 25 °C and 0.10 M ionic strength. When Λ-[Co(phen) 3] 3+ is used as oxidant, chiral induction is observed and the [Co(edta)] − product shows a enantiomeric excess of 20% of the Λ isomer. This homochiral (ΛΛ) preference contrasts with the heterochiral (ΔΛ) preference found previously for reactions of [Co(edta)] 2− with [Fe(phen) 3] 3+ and [Os(phen) 3] 3+. Interpretation of the results is aided by 1H NMR relaxation studies of the ion pair {[Co(phen) 3] 3+, [Co(edta)] −}.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
