Abstract

Circularly polarized luminescence spectroscopy has been used to study the ternary complexes formed by europium(III) ..beta..-diketonate complexes and methyl p-tolyl sulfoxide. Adduct complexes having 1:1 and 1:2 chelate/substrate stoichiometries were formed, depending on the degree of fluorination in the ..beta..-diketone chelate rings. Enhancements in the Eu(III) luminescence intensities and lifetimes were used to evaluate the formation constants of the adduct complexes. In the 1:1 adduct complexes, the Eu(III) chirally was determined primarily by vicinal effects. In the 1:2 adduct complexes, evidence was obtained that indicated that presence of weak configurational effects due to geometrical isomerism. 21 references, 6 figures, 4 tables.

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