title: Thermoreversible luminescent organogels doped with Eu(TTA)3phen complex.
abstract: This manuscript details the preparation and characterization of luminescent organogels in toluene. Gels were prepared by using 12-hydroxystearic acid (12HSA) as gelator and different amounts of thenoyltrifluoroacetonato 1,10-phenanthroline europium(III) complex (Eu(TTA)3phen). The gelation properties and the thermoreversible behavior from solid-like to liquid systems were investigated by differential scanning calorimetry. At higher concentration, an interaction of Eu complex with the polar group of the gelator was revealed by DSC and FTIR analyses. The spectroscopic behavior of the complex was investigated in toluene solution and in the gel state. TEM analysis revealed that 12HSA is able to solvate the Eu diketonate complex inducing a remarkable increase in the Eu-Eu distance. The Eu(TTA)3phen in the gel state exhibits a very high emission quantum yield, Φ, which was found to be independent of Eu complex concentration, at least for the composition range analyzed. These results indicate that 12HSA organogels containing Eu(TTA)3phen are promising materials for optical applications.
authors.affiliation: Istituto di Chimica e Tecnologia dei Polimeri (CNR), Pozzuoli (NA), Italy.
authors.forename: Maria Laura
authors.initials: ML
authors.lastname: Di Lorenzo
authors.forename: Mariacristina
authors.initials: M
authors.lastname: Cocca
authors.forename: Gennaro
authors.initials: G
authors.lastname: Gentile
authors.forename: Maurizio
authors.initials: M
authors.lastname: Avella
authors.forename: David
authors.initials: D
authors.lastname: Gutierrez
authors.forename: Monica
authors.initials: M
authors.lastname: Della Pirriera
authors.forename: Manus
authors.initials: M
authors.lastname: Kennedy
authors.forename: Hind
authors.initials: H
authors.lastname: Ahmed
authors.forename: John
authors.initials: J
authors.lastname: Doran