Four mixed tetradentate Cu(II) chelates were prepared by reacting a copper salt, acety acetone, and ethylene-diamine with salicylaldehyde, o-hydroxyacetophenone, o-hydroxypropiophenone, and o-hydroxybutyrophenone, respectively. The I.R., optical, and E.S.R. spectra were obtained and discussed with regard to the expected bonding changes and/or those predicted by a model molecular orbital calculation for mixed ligand complexes.
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Kuska et al. (1972) studied this question.
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