Luminescence of the films of europium (III) with thenoyltrifluoroacetonate and macrocyclics

We discuss the syntheses, properties and the luminescence of the complexes, Eu(TTA) 3 · 2L · H 2 O, where TTA = thenoyltrifluoroacetonate, L=15C5 (1,4,7,10-tetraoxa-13-azacyclopentadecane,13-phenyl) and 18C6 (2,3,11,12-dicyclohexano-1,4,7,10,13,16-hexaoxacyclooctadecane). The film complexes with 15C5 and 18C6 ligands contain only one water molecule. The Ω λ experimental intensity parameters ( λ =2 and 4) and the ratio between the intensities of the 5 D 0 → 7 F 0 and 5 D 0 → 7 F 2 transitions ( R 02 ) were obtained for the compounds Eu(TTA) 3 · 2(15C5) · H 2 O ( Ω 2 =39.5 × 10 −20 cm 2 , Ω 4 =8.9 × 10 −20 cm 2 and R 02 =0.0087) and Eu(TTA) 3 · 2(18C6) · H 2 O ( Ω 2 =39.3 × 10 −20 cm 2 , Ω 4 =5.8 × 10 −20 cm 2 and R 02 =0.0098). The macrocyclic compounds, powder form, were also measured. The luminescence spectra of the Eu(TTA) 3 · 2L · H 2 O films give the largest Ω 2 intensity parameter, due to the hypersensitive 5 D 0 → 7 F 2 transition and indicating that the rare earth ion is in a polarizable chemical environment. The lifetimes of the macrocyclics complexes in the powder and film were measured.