Abstract
By the use of elementary ligand field theory to interpret the absorption spectra of complexes formed in the copper(II)–1,10-phenanthrolene (Phen) system in an acetone medium, it has been shown that the mono-Phen complex is of approximately octahedral symmetry and the bis-Phen complex probably has a trigonal bipyramidal structure. At high Phen concentration, a tris-complex is formed that is probably trigonally distorted from octahedral symmetry. The results of the present work suggest that the "pentammine effect" observed in spectra of the copper(II)–ammonia complex is due to the formation of a trigonal bipyramidal complex.
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