Abstract
The complexes [Co(Chel)(PBu3)]ClO4 · H2O [Chel = BFE (bis(1,1,1-trifluoroacetylacetone)ethylenediimine) and BCE (bis(3-chloroacetylacetone)ethylenediimine)] and [Co(Chel)(PPh3)]ClO4 · H2O, (Chel = BBE = bis(benzoylacetone)ethylenediimine and BFE), were synthesized and characterized. The spectroscopic and electrochemical properties of cobalt(III) derivatives of BAE (bis(acetylacetone)ethylenediimine) and related ligands have also been investigated. Electronic spectroscopic data indicate that the absorption between 600 and 760 nm in Co(III) BAE complexes is related to the lowest d–d transition. Axial ligands affect this transition and the reduction potential of Co(III) to Co(II) through σ-interaction with the dz2 orbital. The π acceptor property of Schiff-base ligands increases in the order:
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