title: Characterization of a novel intrinsic luminescent room-temperature ionic liquid based on [P6,6,6,14 ][ANS].
abstract: Intrinsically luminescent room-temperature ionic liquids (RTILs) can be prepared by combining a luminescent anion (more common) or cation with appropriate counter ions, rendering new luminescent soft materials. These RTILs are still new, and many of their photochemical properties are not well known. A novel intrinsic luminescent RTIL based on the 8-anilinonaphthalene-1-sulfonate ([ANS]) anion combined with the trihexyltetradecylphosphonium ([P6,6,6,14 ]) cation was prepared and characterized by spectroscopic techniques. Detailed photophysical studies highlight the influence of the ionic liquid environment on the ANS fluorescence, which together with rheological and (1) H NMR experiments illustrate the effects of both the viscosity and electrostatic interactions between the ions. This material is liquid at room temperature and possesses a glass transition temperature (Tg ) of 230.4 K. The fluorescence is not highly sensitive to factors such as temperature, but owing to its high viscosity, dynamic Stokes shift measurements reveal very slow components for the IL relaxation.
authors.affiliation: REQUIMTE, Chemistry Department, Universidade Nova de Lisboa, 2829-516, Caparica (Portugal); Vicarte-Vidro e Cerâmica para as Artes, Universidade Nova de Lisboa, 2829-516, Caparica (Portugal).
authors.forename: Joana M
authors.initials: JM
authors.lastname: Delgado
authors.forename: Anabela
authors.initials: A
authors.lastname: Raymundo
authors.forename: Márcia
authors.initials: M
authors.lastname: Vilarigues
authors.forename: Luís C
authors.initials: LC
authors.lastname: Branco
authors.forename: César A T
authors.initials: CA
authors.lastname: Laia
mesh_terms: D000817:Anilino Naphthalenesulfonates / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry*; D049449:Luminescence; D049408:Luminescent Agents / Q000737:chemistry*; D009943:Organophosphorus Compounds / Q000737:chemistry*; D014783:Viscosity
chemical_list: C515594:8-anilino-1-naphthalenesulfonic acid; D000817:Anilino Naphthalenesulfonates; D052578:Ionic Liquids; D049408:Luminescent Agents; D009943:Organophosphorus Compounds; C559940:trihexyltetradecylphosphonium chloride
keywords: ANS; fluorescence; ionic liquids; photophysics; rheology