Abstract
Many complexes of metals, particularly with chelating ligands, are in principle resolvable, although resolution may not be possible for kinetic reasons. Electronic transitions within the resolved molecules are optically active, in accordance with the appropriate selection rules. Circular dichroism is highly useful both in establishing optical configurations on the basis of comparisons with compounds of known configurations, and as spectroscopic tool. Applications have referred chiefly to the transitions occurring within the
d
orbitals. When the chelating ligands are themselves asymmetric, the number of possible isomers increases, and it is commonly found, using one enantiomer, say ( + ), of a ligand, that the two diastereoisomers D( + + + ) and L ( + + + ) have quite distinct properties. [In the notation used, D and L refer to configurations of the complex as a whole, and ( + ) refers to the sign of rotation of the ligand.]
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11 articles.
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