Abstract
Three kinds of novel luminescent complexes of Eu(III) with mixed ligands of P-diketone and diaza-18-crown-6 ([2, 2]) were synthesized: H2[Eu(TTA)4]2. [2, 2] (A), [Eu(TTA)3]2. [2, 2] (B) and [Eu(DBM)3]2. [2, 2] (C) (HTTA = thenoyltrifluoroacetone, HDBM = dibenzoylmethane and [2, 2] = diaza-18-crown-6). Their observed fluorescence intensities are greater than those of the complexes Eu(TTA)3. 2H2O (D) and Eu(DBM)3. 2H2O (E), respectively, with the relative intensity ratios being A: B: D = 13.7 : 3.7 : 1 and C : E = 11.6: 1. The monochromaticity of fluorescence of these complexes was also found to be improved in A, B and C, presumably because the macrocycle was introduced into the complexes. A possible mechanism of fluorescence enhancement is proposed. The properties of these complexes were determined by TG and DTA methods as well as FT-IR and FT-Raman spectroscopy.
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