Static and Dynamic Distortions in Five-Coordinate Complexes of cobalt(II) and rhodium(I)

✍ Scribed by B. R. Higginson; C. A. McAuliffe; L. M. Venanzi

• Publisher: John Wiley and Sons
• Year: 1975
• Tongue: German
• Weight: 982 KB
• Volume: 58
• Category: Article
• ISSN: 0018-019X
• DOI: 10.1002/hlca.19750580504

✦ Synopsis

Abstract

Five‐coordinate complexes have been prepared, of the general formulae [CoX(L'L~3~)]^+^ and [RhX(L'L~3~)], where X = halogen and L'L~3~ = a quadridentate tripod‐like ligand containing various Group V donor atom sets. The electronic spectra and magnetism of the cobalt(II) series can be interpreted on the basis of a low‐spin d^7^‐ion in a trigonal bipyramidal environment distorted by a static Jahn‐Teller effect. Electronic spectral data for the trigonal bipyramidal rhodium(I) series show that the low‐energy ^1^A → ^1^E ligand field transition is split at room temperature, but that the splitting collapses on reducing the temperature. This behaviour has been attributed to the operation of a dynamic Jahn‐Teller effect.