Luminescence of the films of europium (III) with thenoyltriuoroacetonate and macrocyclics.

Abstract

We discuss the syntheses, properties and the luminescence of the complexes, Eu(TTA)3 á 2L á H2O, where TTA . thenoyltriuoroacetonate, 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 ®lm complexes with 15C5 and 18C6 ligands contain only one water molecule. The Xk experimental intensity parameters (k.2 and 4) and the ratio between the intensities of the 5D0 ® 7F0 and 5D0 ® 7F2 transitions (R02) were obtained for the compounds Eu(TTA)3 á 2(15C5) á H2O (X2 .39.5 ´ 10ÿ20 cm2, X4 .8.9 ´ 10ÿ20 cm2 and R02 .0.0087) and Eu(TTA)3 á 2(18C6) á H2O (X2.39.3 ´ 10ÿ20 cm2, X4 .5.8 ´ 10ÿ20 cm2 and R02 .0.0098). The macrocyclic compounds, powder form, were also measured. The luminescence spectra of the Eu(TTA)3 á 2L á H2O ®lms give the largest X2 intensity parameter, due to the hypersensitive 5D0 ® 7F2 transition and indicating that the rare earth ion is in a polarizable chemical environment. The lifetimes of the macrocyclics complexes in the powder and ®lm were measured.