Stereoselective association between optically active tris(1,10-phenanthroline)ruthenium(II) and tris(acetylacetonato)cobalt(III) in water |
| |
| Affiliation: | 1. Department of Chemistry and Biochemistry, Laurentian University, Sudbury, Ontario P3E 2C6, Canada;2. Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada;3. School of Cellular and Molecular Medicine, University of Bristol, Medical Sciences Building, Bristol BS8 1TD, United Kingdom |
| |
| Abstract: | Stereoselective interactions between tris(acetylacetonato)cobalt(III) [Co(acac)3] and optically active Λ-(+)546-tris(1,10-phenanthroline)ruthenium(II) chloride [Λ-[Ru(phen)3]Cl2] were investigated by measuring the distribution coefficients of racemic Co(acac)3 between carbon tetrachloride and water containing Λ-[Ru(phen)3]2+ or pure water, and the optical rotations of the aqueous phase was measured over the temperature range 10–40° C. The Λ-isomer of Co(acac)3 is “salted-in” more strongly by Λ-[Ru(phen)3]2+ than the Δ-isomer. The association constants between Λ-[Ru(phen)]2+ and Λ- or Δ-Co(acac)3 were calculated by using the optical rotation to give K(Λ-Λ) = 3.86 and K(Λ-Δ) = 3.80 at 25°C, respectively. The temperature dependence of the association constants showed that the enthalpy and entropy changes for the Λ-Λ association is slightly more positive than those for the Λ-Δ association. This was discussed from the viewpoint of hydrophobic interactions. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
