title: Synthesis and photoluminescent properties of lanthanides acetoacetanilide complexes.
abstract: This work reports on the photoluminescent properties of three new lanthanide complexes with acetoacetanilide (aaa), a β-diketonate ligand. The complexes have the general molecular formulae [RE(aaa)3(H2O)], they are soluble in organic solvents such as ethanol and chloroform and insoluble in water. The energy of the triplet state was determined at about 4,700 cm(-1) higher than the (5)D4 emitting level of the Tb(III) ion, leading to an absolute quantum yield of 22% for the [Tb(aaa)3(H2O)] complex. The photoluminescent properties were studied and the luminescence parameters of the [Eu(aaa)3(H2O)] complex were experimentally determined. The photostabilities of the complexes under continuous UV irradiation were measured and the data indicate low stability of the [Tb(aaa)3(H2O)] complex when the system is excited at the band attributed to energy transfer from the ligand to terbium(III) ion. However, its photostability is significantly improved under inert atmosphere.
authors: Laboratory of Functional Materials, Institute of Chemistry, University of Campinas, Unicamp, Campinas, SP, Brazil.
authors: E R
authors: ER
authors: Souza
authors: C H F
authors: CH
authors: Zulato
authors: I O
authors: IO
authors: Mazali
authors: F A
authors: FA
authors: Sigoli
mesh_terms: D000083:Acetanilides / Q000737:chemistry*; D056831:Coordination Complexes / Q000138:chemical synthesis* / Q000737:chemistry*; D028581:Lanthanoid Series Elements / Q000737:chemistry*; D049449:Luminescence; D013997:Time Factors; D014466:Ultraviolet Rays
chemical_list: D000083:Acetanilides; D056831:Coordination Complexes; D028581:Lanthanoid Series Elements; C056965:acetoacetanilide
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