Static and Dynamic Distortions in Five‐Coordinate Complexes of cobalt(II) and rhodium(I)
- 16 July 1975
- journal article
- research article
- Published by Wiley in Helvetica Chimica Acta
- Vol. 58 (5) , 1261-1271
- https://doi.org/10.1002/hlca.19750580504
Abstract
Five‐coordinate complexes have been prepared, of the general formulae [CoX(L'L3)]+ and [RhX(L'L3)], where X = halogen and L'L3 = 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 d7‐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 1A → 1E 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.Keywords
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