Abstract
Abstract The binding of a series of phosphine oxides by Eu(FOD)3 (FOD= 6,6,7,7,8,8,8-heptafluoro-2,2-dimethyloctane-3,5-dione) and Eu(TTFA)3 (TTFA = 4,4,4-trifluoro-1-(2-thienyl)-butane-1,3-dione) has been studied by a luminescence titration technique. The relatively strong luminescence of the free metal chelates dissolved in non-coordinating CHCl3 is greatly enhanced when these materials form adducts with the phosphine substrates. Quantitative analysis of the titration curves (emission intensity followed as a function of substrate added) enable a calculation of the association constant of the adduct. The degree of association was found to depend on the steric nature of the alkyl groups associated with the phosphine oxides: systematic examination of trimethyl, triethyl, tri-n-propyl, tri-n-butyl, tri-n-octyl, and triphenyl phosphine oxides revealed the nature of the steric requirement associated with the binding site on the metal chelate.
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