Struktur zweier trans-Bis (N,N-dimethylethylendiamin)kobalt(III)-Komplexe. Simulation der sterischen Ligand-Ligand-Wechselwirkungen durch ein ‘Molecular-Mechanics’-Modell
✍ Scribed by Roman Eminger; Silvio Fallab; Margareta Zehnder; Max Dobler
- Publisher
- John Wiley and Sons
- Year
- 1992
- Tongue
- German
- Weight
- 347 KB
- Volume
- 75
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
The Crystal and Molecular Structures of Two trans -Bis(N,N-dimethylethylenediamine)cobalt(III) Complexes.
Estimate of Steric Ligand-Ligand Interactions by a Molecular-Mechanics Model
Two trans -bis(N,N-dimethylethylenediamine)cobalt(III) complexes with different axial ligands (SNC-, NOT) have been synthesized starting from the corresponding Co"-amine species. An X-ray crystal-structure analysis revealed widely differing Co-N bond distances. While for the primary amino groups, as in complexes of unsubstituted bidentate amines, bond distances are close to 196 pm, those for the tertiary amino groups are stretched by ca. 10 pm. The good agreement between the molecular geometry as calculated by a molecular-mechanics model and experimental data suggests that the differences in bond distances must be primarily due to simple steric effects.