Optical activity of the f–f transitions in trigonal dihedral (D3) lanthanide(III) complexes. I. Theory
- 15 February 1982
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 76 (4) , 1595-1606
- https://doi.org/10.1063/1.443197
Abstract
The theory of natural optical activity in the 4f→4f transitions of trigonal dihedral (D3) lanthanide(III) complexes is developed within the framework of a crystal field model. Within this model, both the chiral and achiral components of the crystal field are represented in terms of multipole‐point charge and multipole‐induced dipole lanthanide–ligand interactions. Electric dipole intensity within the 4f→4f transitions is presumed to arise from interconfigurational mixing between the 4fN, 4fN−1 5d, and 4fN−1 ng configurational states localized on the lanthanide ion, and between the 4fN configurational states of the lanthanide ion and dipolar excitations localized in the ligand environment. Expressions are derived for electronic rotatory strengths, dipole strengths, and dissymmetry factors, and special attention is given to how these quantities are related to the electronic and stereochemical properties of the ligand environment and to the electronic structure of the lanthanide ion. A computational model based on the formal theory is proposed, and qualitative predictions regarding a variety of features to be found in 4f→4f chiroptical spectra are presented.Keywords
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