Characterization of a Novel Intrinsic Luminescent Room‐Temperature Ionic Liquid Based on [P6,6,6,14][ANS] |
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| Authors: | Joana M Delgado Dr Anabela Raymundo Dr Márcia Vilarigues Dr Luís C Branco Dr César A T Laia |
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| Affiliation: | 1. REQUIMTE, Chemistry Department, Universidade Nova de Lisboa, 2829‐516, Caparica (Portugal);2. Vicarte—Vidro e Ceramica para as Artes, Universidade Nova de Lisboa, 2829‐516, Caparica (Portugal);3. CEER ‐ Biosystems Engineering, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349‐017 Lisboa (Portugal) |
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| 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 1H 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. |
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| Keywords: | ANS fluorescence ionic liquids photophysics rheology |
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