Optical rotatory power of co-ordination compounds. Part XVII. The circular dichroism of trisbipyridyl and trisphenanthroline complexes
- 1 January 1973
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 9,p. 949-955
- https://doi.org/10.1039/dt9730000949
Abstract
The circular dichroism spectra of (+)-[Cr(bipy)3]3+, (+)-[Rh(phen)3]3+. (+)-[Rh(bipy)3]3+, (+)-[Co(phen)2-(NO2)2]+, and (–)-[Co(bipy)2(NO2)2]+, are reported, and the corresponding spectra of trisbipyridyl and tris-phenanthroline complexes previously studied have been remeasured over a more extended frequency range under higher resolution. The criteria proposed for determining the frequency-order of the principal exciton, c.d. bands derived from the coupling of long-axis polarised ligand π-excitations are reappraised, and it is concluded that the methods based primarily on isotropic absorption data are contraindicated. A method based largely on the c.d. data is used to obtain the frequency-order, and thence the stereochemical configuration of a range of isomers in the bis- and tris-bipyridyl and -phenanthroline series.Keywords
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