Abstract
It is shown that no arbitrary distortion of an octahedral complex can provide a first-order contribution to the optical rotation and that this result is also true for certain other complexes of high symmetry. The second-order effects of the odd parity ligand field are investigated for the Co(en)3 3+ ion (en = ethylenediamine) and found to provide a reasonably satisfactory explanation of the higher wavelength part of the optical rotatory dispersion curve.

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