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Details van artikel 11 van 116 gevonden artikelen
| Titel: |
CHROMATOGRAPHIC RESOLUTION MECHANISM OF A TRIS(1, 10-PHENANTHROLINE)SILICON(IV) COMPLEX |
| Auteur: |
Ohmori, Yasuharu Kojima, Masaaki Kashino, Setsuo Yoshikawa, Yuzo |
| Verschenen in: |
Journal of coordination chemistry |
| Paginering: | Jaargang 39 (1996) nr. 3-4 pagina's 219-230 |
| Jaar: |
1996-11-01 |
| Inhoud: |
The ion-association constants between the optically active complex cations (A- or Δ-[Si(phen)3]4+) and the resolving agent anions ([Sb2[(+)-tart]2-]2-, tart = tartrate(4-) ion) were determined spectrophotometrically. Ion-association between the complex cation and the eluent union occurred in two steps and the stereoselective interaction was observed in the second step. The second-step association constant for the A-enantiomer (K2 = 1.41 × 103) is larger than that for the Δ-enantiomer (K2 = 1.07 × 103). The second-step association plays a dominant role in determining the elution order in column chromatographic resolution. The molecular mechanics calculations for the ion-associated species were performed to obtain information about the microscopic interaction between the ions. The total strain energy for the species containing the A-enantiomer is smaller than that for the Δ-enantiomer and this can explain the experimental finding that the A-enantiomer is eluted faster than the Δ-enantiomer. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 11 van 116 gevonden artikelen
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